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Barry Allen, a forensic crime scene assistant for Central City Police Department, is struck by lightning during a storm that is created after a particle accelerator from S.T.A.R. Labs explodes. In a coma for nine months, Barry awakens in S.T.A.R. Labs, having been placed in the care of its founder Harrison Wells and his assistants Dr. Caitlin Snow and Cisco Ramon. Barry learns that he can move at extraordinary speeds, and that there were other "metahumans" created from the explosion. One of them, Clyde Mardon, is robbing banks with his ability to control the weather. In order to stop Mardon, Barry is outfitted with a suit, designed by Cisco, that can withstand his high speed. He tracks down Mardon and with Detective Joe West, who learns of Barry's abilities, Barry is able to stop Mardon, who is killed by Joe. With his new powers, Barry vows to exonerate his father, Henry, who is incarcerated for murdering his wife, Nora, whom Barry witnessed, at a young age, being killed by another metahuman. He chooses the alias "Flash" for his alter ego. Wells, secretly revealed to be neither paraplegic nor needing glasses, reads a newspaper from 2024 stating the missing status of the Flash.22"Fastest Man Alive"David NutterStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Andrew Kreisberg & Geoff JohnsOctober 14, 20143J53524.27[3]In flashbacks, it is revealed that Joe became Barry's legal guardian but did not let him visit Henry in prison at the latter's request. Barry begins using his abilities to stop minor crimes and help citizens across the city while starting to develop debilitating side effects. While guiding Iris West, who seeks his help to do her school assignment, Barry witnesses a robbery by a crew of men, but passes out while trying to stop them. The S.T.A.R. Labs team determines that Barry becomes hypoglycemic from the use of his abilities due to a sped-up metabolism and needs to ingest more calories to maintain his energy level. The team eventually learns that there is actually one robber, Danton Black, who has the ability to create clones of himself. Black intends to kill his former employer Simon Stagg, who stole Black's cloning research. With encouragement from Joe, Barry goes after Black and successfully stops him. However, Black commits suicide. Afterward, Barry accepts Joe's help in the investigation of Nora's murder. Later, Wells visits Stagg, who has already become obsessed with the Flash and plans to exploit them as he did to Black. Wells then kills Stagg.33"Things You Can't Outrun"Jesse WarnAlison Schapker & Grainne GodfreeOctober 21, 20143J53533.59[4]As the police investigate the murder of one of the city's crime families, Barry suspects that the killer may be a metahuman who can control poison gases. As Barry and Joe work to discover the killer's identity, Wells and his team work to retrofit the particle accelerator into a prison for metahumans where they can begin to find a way of reversing their mutations. This brings up difficult feelings and memories for Snow, whose fiancé, Ronnie Raymond, was killed by the explosion. The team identifies the killer as Kyle Nimbus, discovering that Nimbus does not control gases, but transforms his body into them. The team learns that Joe, the lead detective in the original case, is Nimbus' next target. Barry races to Iron Heights Prison to save Joe's life, forcing Nimbus to overexert himself so that he can apprehend him. The team locks Nimbus into a cell they have made. In a flashback to when the accelerator explodes, Wells is seen going into his hidden room and viewing a surveillance video of Barry getting struck by lightning in his lab.44"Going Rogue"Glen WinterGeoff Johns & Kai Yu WuOctober 28, 20143J53543.53[5]Wells begins testing Barry's powers by having him perform multiple tasks at superspeed. In the middle of the tests, a group of men attempt to hijack an armored truck carrying a diamond on its way to a museum. Barry races over and stops the crime, later identifying Leonard Snart from a set of police mugshots. Felicity Smoak arrives to check on Barry, after learning that he woke from his coma. Barry introduces her to his friends at S.T.A.R. Labs. Realising that the Flash, also known as the "Streak", is a man and not some kind of drone like the rest of his crew believe, Snart acquires a couple of items of stolen tech to help him continue without any powers. This includes a cryonic gun taken from S.T.A.R. Labs. He begins surveilling the diamond at the museum, but is seen and forced to use his cold gun to escape. Cisco reveals that he created the gun as a fail-safe against Barry should he become a villain like the other metahumans they have encountered. Felicity helps the team locate Snart, who is now working on his own, when he sets a trap for Barry. Cisco, Caitlin, and Felicity arrive in time to save Barry, and Snart is able to escape. Joe finally accepts Iris's relationship with Eddie Thawne, his partner. Wells demands Cisco not to build another fail-safe against Barry again. Barry kisses Felicity goodbye. Later, Snart tracks down his former partner, who has an affinity for fire, and offers him the other weapon he stole and a place by Snart's side taking back Central City from the Flash.55"Plastique"Dermott DownsAaron Helbing & Todd Helbing & Brooke EikmeierNovember 11, 20143J53553.46[6]Bette Sans Souci, a metahuman with the ability to turn anything she touches into an explosive, appears in Central City. She is being hunted by General Wade Eiling, and is a former military explosives expert. Barry brings her to S.T.A.R. Labs where the team explains to her that she was changed by the particle accelerator, which bonded bomb shrapnel to her body on a cellular level; and they cannot reverse the process. Secretly, Wells convinces Bette to kill Eiling. Barry races to stop her, and Eiling shoots her, who dies after mentioning Wells' name. Her body turns into a bomb. Barry speeds off with the body and drops it in the river to save the city from the massive explosion. Eiling visits Wells, demanding that they work together once again, this time to collect metahumans. Wells refuses and warns Eiling to never return to S.T.A.R. Labs. Meanwhile, Barry ends his friendship with Iris after she refuses his advice not to write about the "Streak". In a flashback set five years previously, Wells tells Eiling he is ending their experiments. After Eiling leaves, Wells walks to a cage and tells Gorilla Grodd that he has plans for him.66"The Flash Is Born"Millicent SheltonJaime Paglia & Chris RaffertyNovember 18, 20143J53563.73[7]Barry speeds off to stop a car thief; but the thief's skin turns to steel and Barry breaks his hand while punching. He runs back to the lab before he can be hurt further. The thief is identified as Tony Woodward, Barry's childhood bully. Back at the lab, Cisco determines that if Barry can hit Woodward with a specific velocity at right angle, then he can create enough force to compromise Woodward's metal structure. Woodward kidnaps Iris and demands that she write about him. Barry arrives and manages to temporarily disable Woodward's abilities. Afterward, Woodward is locked away at S.T.A.R. Labs and finds out that Barry is the Flash, the name Iris also uses in her blog on the advice of Barry, who reconciles with her. Meanwhile, Joe continues investigating Nora's murder and gets suspicious of Wells, who opened S.T.A.R. Labs one month after Nora's murder; but Wells states that he came to Central City because of his wife's death. Joe, convinced that Wells is not involved, is visited by the mysterious second speedster who killed Nora, stealing the case file and threatening Iris's life if Joe does not drop his investigation.77"Power Outage"Larry ShawAlison Schapker & Grainne GodfreeNovember 25, 20143J53573.47[8]Wells returns to his secret room, where it is revealed that he has been documenting Barry's abilities, and using his artificial intelligence, Gideon, to look at events in the future. Barry arrives at a crime scene where the victim was murdered via electrocution, and charred beyond recognition, suggesting a metahuman was involved. While investigating the victim's identity, the team identifies a power drain in the city. When Barry arrives, he is attacked by Farooq Gibran, a man who has the ability to siphon electrical energy. The attack drains Barry of his speed, and Gideon reveals to Wells that there are currently no references to the Flash in the future. Wells realizes that Barry's problem is psychological. Gibran attacks S.T.A.R. Labs, kills Woodward and Wells' life gets in danger, forcing Barry to overcome his fear, connect to his speed and kill Gibran. Meanwhile, Tockman starts a hostage crisis at a police station and critically shoots Eddie; but Iris manages to stop him and he is rearrested. Later, Wells sees that the timeline is safe, and takes a sample of Gibran's blood to determine how he was able to drain Barry's abilities.88"Flash vs. Arrow"Glen WinterStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Ben Sokolowski & Brooke EikmeierDecember 2, 20143J53584.34[9]
Eddie proposes a task force to hunt down the Flash. A new metahuman, Roy Bivolo, shows up with the ability to send people into an uncontrollable rage, and uses his ability to rob a bank. Oliver Queen informs Barry that he and his team are tracking a killer who uses lethal boomerangs.[a] Barry and Oliver agree to team-up and catch each other's targets. Barry decides to go after Bivolo by himself. Bivolo uses his abilities on Barry; but because of Barry's powers it makes the effects last longer. Oliver tries to stop Barry, and the two engage in a fight until Wells and Joe use colored strobe light to reset Barry's emotional state. Afterward, Barry and Oliver capture Bivolo and place him in the prison at S.T.A.R. Labs. Eddie's task force is established after he was beaten by an enraged Flash. Barry confirms Oliver's belief that he has a lot to learn. Oliver advises him to stay away from Iris, whom Barry is in love with. Iris decides to end her support of the Flash. Oliver asks Barry's team to keep his alter ego a secret. A new metahuman able to manipulate fire appears in Central City.
This episode begins a crossover event that concludes on Arrow season 3 episode 8.99"The Man in the Yellow Suit"Ralph HemeckerTodd Helbing & Aaron HelbingDecember 9, 20143J53594.66[10]The yellow-suited speedster who killed Nora Allen returns, in search of Mercury Lab's tachyon particle technology. Barry encounters the "Reverse-Flash" and engages him but is swiftly defeated, with the villain insinuating that he and Barry have been lifelong enemies. Ronnie is revealed as the flame-controlling metahuman, suffering from memory-loss after having survived the explosion. Per Henry's advice, Barry confesses his love for Iris before the tachyon particle technology is used as bait to lure the Reverse-Flash into a trap. The villain manages to escape, however, and proceeds to attack Wells and the police, mysteriously sparing Eddie before engaging in Barry again. Ronnie appears and fends off the Reverse-Flash before they both flee the scene. Joe tells Eddie about metahumans and asks him to keep it a secret. Cisco realizes that there were two speedsters in Barry's house the night Nora died. Later, Wells enters his secret room and reveals the Reverse-Flash suit in a hidden chamber. Wells places the stolen tachyon device on it, and speaks in the villainous speedster's distorted voice, revealing himself to be the Reverse-Flash.1010"Revenge of the Rogues"Nick Copus
As Barry works on improving his speed through various training exercises, Leonard Snart returns to Central City with the cold gun and a new partner, Mick Rory, to set a trap for the Flash. Barry discovers his plan, and agrees with Wells not to engage Snart in the hope that he goes away and no one gets hurt like the last time. Snart and Rory, who now has a gun that can emit absolute hot temperatures, kidnap Caitlin to force Barry out of hiding. Cisco and Barry find a way to defeat Snart and Rory. The Flash faces the duo in the city for a showdown, exposing himself to the public. Barry eventually gets them to cross their streams with Eddie's help, successfully damaging the weapons and disabling the pair, who are arrested and the guns delivered to S.T.A.R. Labs. While in transport to Iron Heights, Snart and Rory are broken out by Snart's sister. Meanwhile, Caitlin investigates the cause of Ronnie's transformation and finds out that the Army is covering up the incident. After Iris moves in with Eddie, Barry decides to move back in with Joe.1111"The Sound and the Fury"John F. ShowalterAlison Schapker & Brooke EikmeierJanuary 27, 20153J53614.08[12]While home, Wells receives a threatening call from an unidentified person before using his super speed to save his life from an attempt. Wells informs Barry and the team that the caller was Hartley Rathaway, a former protégé. Rathaway begins attacking his family's business with sonic blasts, and after Barry stops him, Rathaway reveals that he knows a secret of Wells', who states that Rathaway warned him that the particle accelerator could explode, but Wells chose to risk it for the rewards. Cisco discovers that Rathaway intentionally got caught so he could steal information from S.T.A.R. Labs that would allow him to identify the frequency of Barry's molecules so he can kill him. A trap set by Rathaway starts shredding Barry's organs. Wells manages to disable Rathaway's weapons. Later, Joe has Eddie start an investigation into Wells. Rathaway, imprisoned back in the particle accelerator, reveals to Cisco that he knows where Ronnie is and how to save him. In his secret room, Wells uses the tachyon technology to temporarily recharge his Speed Force energy. Meanwhile, Iris starts working as a journalist and realizes that she is hired to write about the Flash.1212"Crazy for You"Rob HardyAaron Helbing & Todd HelbingFebruary 3, 20153J53623.60[13]A woman with the ability to teleport to any location she can see breaks into Iron Heights and frees her boyfriend, Clay Parker. The S.T.A.R. Labs team identifies the woman as Shawna Baez. To help Barry, Henry tracks down leads in Iron Heights and finds out that Parker owed money to a local crime boss and is planning a heist to pay it back. Barry learns the location of the heist, finding Baez and Parker and is able to capture her after removing all the lights in a tunnel, effectively making her unable to teleport without being able to see. Parker manages to escape. Meanwhile, Cisco brings Rathaway out of his cell so that the latter can show the truth about Ronnie; Rathaway reveals that Doctor Martin Stein, who developed research into a F.I.R.E.S.T.O.R.M. project focused on transmuting elements, was at S.T.A.R. Labs the day of the explosion. Rathaway reveals that during the explosion Ronnie and Stein merged, before he escapes Cisco's custody. Barry starts dating Iris's colleague, Linda Park. Henry insinuates to Barry that he knows Barry's alter ego. Elsewhere, two city workers are attacked by Grodd.1313"The Nuclear Man"Glen WinterAndrew Kreisberg & Katherine WalczakFebruary 10, 20153J53633.66[14]The team attempts to track Stein's whereabouts after he attacks a scientist. They convince Stein into coming back to S.T.A.R. Labs for testing. Wells discovers that Ronnie and Stein's atoms are in conflict, and if it continues they will become nuclear. Stein leaves for a secluded location to safely explode without casualties. Barry and Caitlin arrive and use a device Wells made from the tachyon to separate the bodies, but it apparently does not work, and the duo escapes the explosion, which alerts Eiling, who orders a team to recover "Firestorm". Meanwhile, Joe enlists Cisco's help to identify Nora's murderer. The duo searches the house and finds blood from two people behind some new wallpaper. Joe asks Cisco to compare the blood to Wells'. Cisco runs the blood and informs Joe that while neither is from Wells, one is from an adult Barry. In the meantime Linda believes Barry to be still in love with Iris, but he proves to Linda that he now loves her not Iris.1414"Fallout"Steve SurjikKeto Shimizu & Ben SokolowskiFebruary 17, 20153J53644.01[15]Barry and Caitlin find Ronnie and Stein alive and separated, which Eiling also finds out. Joe reveals his findings to Barry. Ronnie and Stein realize that their minds are partially connected. Wells visits Eiling, who reveals that he knows Barry's alter ego and demands the F.I.R.E.S.T.O.R.M. project. Wells gives up Stein, who is tortured by Eiling until Barry and Ronnie save him. Ronnie and Stein reunite by the tachyon piece to survive the military onslaught. The duo gains enough control to be able to merge and separate on command. They decide to leave Central City to stay ahead of Eiling and learn more about their new powers. Meanwhile, Iris's colleague, Mason Bridge tells her his belief that Wells deliberately caused the S.T.A.R. Labs explosion. Iris suspects Caitlin's activities and decides to help Mason with his investigation. Barry tells Joe that he will travel back in time again to save Nora from the Reverse-Flash, but intends to succeed by learning the mistakes in his previous attempt. As the Reverse-Flash, Wells kidnaps Eiling and brings him to the sewers. Wells reveals himself to Eiling, and allows Grodd, who is displaying psychic abilities, to drag Eiling deeper into the sewer.1515"Out of Time"Thor FreudenthalTodd Helbing & Aaron HelbingMarch 17, 20153J53653.69[16]Mark Mardon, Clyde's brother, returns to Central City to avenge Clyde's death. Eddie and Linda get jealous of the intimacy between Barry and Iris. Mason shares his knowledge that Wells killed Stagg with Iris and Barry, who tells Caitlin and Cisco, who begins to believe Joe was right about Wells, so he rechecks the containment field that failed to hold the Reverse-Flash. Wells arrives and reveals himself to be Eobard Thawne, a relative of Eddie's and a man from the future who came back in time to kill Barry, and has since been stranded in the present day. Thawne also explains that he is pushing Barry to get stronger so that he can use Barry's powers to return to his time, and he murders Cisco to protect his secret. Mardon kidnaps Joe and forces him to watch as Mardon creates a tsunami in order to kill Iris. Barry reveals his secret identity to Iris, just after they admit to romantic feelings for each other, in order to save the city. Barry runs back and forth across the coastline to create a barrier against the tsunami, but he runs so fast that he travels back in time to the day before.1616"Rogue Time"John BehringStory by : Grainne Godfree
Teleplay by : Brooke Eikmeier & Kai Yu WuMarch 24, 20153J53663.33[17]Thawne warns Barry not to change any event for fear that he will create a bigger problem. Barry does not listen and instead captures Mardon and puts him in the particle accelerator. Snart and Rory return to Central City. Snart sends his sister, Lisa after Cisco, whom they force to rebuild the cold and heat guns, and a third gun shooting gold for Lisa, by threatening to kill Cisco's brother. Iris rejects Barry's romantic approach and later Eddie punches him. Barry realizes that Thawne was right about not to manipulate the timeline. Cisco returns and reveals that Snart forced him to reveal the Flash's true identity. Barry goes after Snart, and the two come to a truce: Snart will not reveal Barry's identity, will no longer kill innocent people, and stay away from Barry's loved ones in exchange for Barry not locking him away in the particle accelerator. Caitlin tells Eddie and Iris that Barry is suffering from psychosis as a result of the lightning, making the duo reconcile with him and settling the tension. The Reverse-Flash kills Mason and destroys the evidence linking Thawne to Stagg's death. Mason's vanishing causes Barry to accept Joe was right about "Wells".1717"Tricksters"Ralph HemeckerAndrew KreisbergMarch 31, 20153J53673.67[18]Barry and Joe go after terrorist Axel Walker, under the alias Trickster. Walker sets a diversion for the Flash and breaks James Jesse, the original Trickster from 20 years prior, out of prison. Jesse and Walker attempt to extort patrons of fundraiser by poisoning them and ransoming the antidote. When the Flash arrives, Jesse and Walker fit him with a bomb that will detonate if he stops moving. Thawne coaches Barry on how to vibrate his molecules so that he can phase through objects, which removes the bomb. Afterward, Barry provides an antidote to all the patrons before capturing Jasse and Walker. The Flash reveals his identity to Eddie and convinces him to keep Iris from investigating Mason's disappearance. Barry tells Eddie and Joe that "Wells" is the Reverse-Flash. In flashbacks, after failing to kill Barry, the Reverse-Flash escapes only to lose his speed. Gideon informs him that traveling through time has drained his powers. Thawne kills Harrison Wells and steals his appearance and identity so he can develop the particle accelerator sooner and return to his timeline.1818"All Star Team Up"Kevin TancharoenGrainne Godfree & Kai Yu WuApril 14, 20153J53683.67[19]As Barry works in conjunction with Joe and Eddie to stop crimes across the city, an engineering professor is killed by a swarm of bees at a university. While the team searches for a metahuman that can control bees, Felicity arrives with Ray Palmer, looking for assistance to improve his A.T.O.M. suit. The team tracks another bee attack, but Barry is too late and is attacked by the swarm. The team captures one of the bees, which turns out to be a robot and their suspect just a scientist from Mercury Labs named Brie Larvan, who is targeting other former employees. During the next bee attack, Barry goes after Larvan while Ray attempts to stop the bees from killing Dr. Tina McGee. Felicity disables the robots, and Barry captures Larvan. Tina tells Barry that "Wells" personality changed after his wife's demise. Iris threatens Eddie to break up if he does not share his secret. Barry informs Caitlin and Cisco about "Wells". She does not want believe it, but Cisco does, revealing that he has been having "dreams", which show his final moments with Thawne in the alternate timeline.1919"Who Is Harrison Wells?"Wendey StanzlerRay Utarnachitt & Cortney NorrisApril 21, 20153J53693.75[20]Barry and Eddie track a metahuman named Hannibal Bates, who can shape-shift into anyone he touches. Bates takes Eddie's shape and frames him for murder. Later, Bates knocks Barry unconscious and assumes his form, but Thawne realizes the truth and prevents Bates from killing Caitlin and Iris. Bates manages to escape. Caitlin develops a serum to suppress Bates' power, allowing Barry to defeat him and clear Eddie's name. Iris reconciles with Eddie, who reveals his cooperation with the Flash. Bates is locked in the particle accelerator. Meanwhile, Joe and Cisco decide to investigate the car accident scene in Starling City where Wells' wife died. With the help of Captain Quentin Lance, Cisco and Joe locate a buried corpse near the crash site. Cisco also modifies a sonic device for Laurel. Joe advises Quentin to reconcile with her. After a series of tests confirm the corpse is the real Wells, Barry, Caitlin and Cisco locate Thawne's secret room at S.T.A.R. Labs. They find both the Reverse-Flash's costume and the newspaper article from 2024.2020"The Trap"Steve ShillAlison Schapker & Brooke EikmeierApril 28, 20153J53703.93[21]Barry talks to Gideon and learns about his battle with the Reverse-Flash in the future, as well as key moments in his life that include marrying Iris, a promotion at the CCPD, and the creation of Gideon. With high-tech goggles, the team reawakens Cisco's memories of his alternate-timeline death and the secrets Wells confessed. The team regroups at Joe's house, where Barry reveals his recent time travel and explains his plan to lure Thawne to confess to killing Nora. To trap Thawne, Cisco reverses the polarity of his containment field to protect himself, while Caitlin films the interaction to capture Thawne's confession. The trap fails, but Joe shoots Thawne before he can kill Cisco. As Thawne dies, his body transforms into Hannibal Bates. Thawne himself calls the team, revealing that he was always aware of their actions because he had them under surveillance. Reverse-Flash goes after Iris, but Barry arrives, forcing Thawne to kidnap Eddie instead. Iris finds out about the Flash's identity. Thawne reveals his relation to Eddie. Flashbacks reveal the aftermath of Barry being struck by lightning, and Thawne convincing Joe to let him save Barry's life, and promising to a comatose Barry that he will die.2121"Grodd Lives"Dermott DownsGrainne Godfree & Kai Yu WuMay 5, 20153J53713.62[22]While looking for Eddie and Eobard, Barry confronts a would-be thief at the gold reserve, before being disoriented by an unknown psychological attack. Back at S.T.A.R. Labs, Iris confronts Barry about being the Flash. He is able to stop the thief, who turns out to be Eiling, mind-controlled by Grodd. With a lead from Iris, Barry, Joe and Cisco head into the sewers to look for Grodd. The trio realize that Grodd is getting smarter and larger, and during an attack, Joe is kidnapped by Grodd. Cisco and Caitlin build Barry a device that will prevent Grodd's effect. The device works, but gets damaged in a fight. Barry is able to fight off Grodd's psychic attack and trick him into jumping in front of an on-coming train. Eiling is freed. Iris reveals her feelings for Barry, but states her choice to be with Eddie. Grodd is revealed to be alive and roaming the streets. Meanwhile, Thawne works on a device that will allow him to return to his own time. He reveals to Eddie, Iris and Barry's marriage in the future. Later Thawne completes the device and is revealed to be hiding in a secret chamber inside S.T.A.R. Labs.2222"Rogue Air"Doug AarniokoskiAaron Helbing & Todd HelbingMay 12, 20153J53723.65[23]Cisco discovers that Eobard has been supercharging his speed through his wheelchair, which is why he is so much faster than Barry. The particle accelerator is activated by Eobard, who has managed to repair it. The team is able to find and rescue Eddie, who ends his relationship with Iris. Worried that the metahumans imprisoned inside the particle accelerator will be killed when it reaches full power, the team plans to relocate them to Oliver's prison on Lian Yu. In order to set up a safe transport, Barry requests Leonard's help. Leonard agrees but only after Barry erases all of Leonard's criminal record. Leonard and Lisa sabotage the transport and allow the metahumans to escape, killing Jake Simmons however. Eobard arrives back at the lab just as the accelerator fully charges. Barry, Firestorm and Oliver all meet outside to fight Reverse-Flash. They coordinate their efforts; Oliver stops him with a nanite injection that disables Eobard's speed and knocks him out. Oliver leaves after informing Barry of an upcoming help request.2323"Fast Enough"Dermott DownsStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Gabrielle Stanton & Andrew KreisbergMay 19, 20153J53733.87[24]Barry visits Thawne in the particle accelerator prison, where Thawne reveals he killed Nora because of hating the Flash, whose future self saved him. Eobard requests Barry to help create a wormhole where Thawne can return to his time, while also allowing Barry to save Nora. Caitlin and Ronnie get married. Eobard tells Cisco that the latter's ability to recall events of alternate timelines was acquired from the particle accelerator explosion. Barry decides to go through with Thawne's offer. The latter states that Barry will have only a short time, or else the wormhole will become a black hole. Barry travels back in time, but his future self signals him not to save Nora. The present Barry returns and stops Thawne from returning to his time. The two fight, while the team shuts down the wormhole. Thawne eventually prevails, but before he can kill Barry, Eddie shoots himself, causing Thawne's existence to cease. The wormhole reappears, and the team is unable to prevent it from becoming a black hole. As the black hole begins to tear the city apart, pulling Eddie inside, Barry speeds into it in an effort to stop it.
The second season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, sees Barry recognized as a hero in Central City after saving the city, only to face a new threat from a parallel universe in the form of the speedster Zoom, who seeks to eliminate everyone connected to the Speed Force throughout the multiverse. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg, Gabrielle Stanton, Aaron Helbing, and Todd Helbing serving as showrunners.
The FlashSeason 2
Home media cover
Starring
Grant Gustin
Candice Patton
Danielle Panabaker
Carlos Valdes
Keiynan Lonsdale
Tom Cavanagh
Jesse L. Martin
Country of originUnited StatesNo. of episodes23ReleaseOriginal networkThe CWOriginal releaseOctober 6, 2015 –
May 24, 2016Season chronology
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Season 1
Next →
Season 3
List of episodes
The season was ordered in January 2015, and filmed from that July to the following April in Vancouver. Grant Gustin stars as Barry, alongside principal cast members Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh, and Jesse L. Martin also returning from the first season, and are joined by Keiynan Lonsdale. This season also introduces characters from Legends of Tomorrow, which was being developed as a spin-off.
The season ran for 23 episodes and premiered on October 6, 2015, airing on The CW until May 24, 2016. The premiere was watched by 3.58 million viewers, down from the first-season premiere but average for the series. The second season of The Flash received universal acclaim from critics, being viewed as an improvement over the first season, and finished as the 112th ranked show, slightly up from season one, with an average viewership of 4.25 million. The series was renewed for a third season on March 11, 2016.[1]
EpisodesEdit
See also: List of The Flash episodes
The Flash season 2 episodesNo.
overallNo. in
seasonTitleDirected byWritten byOriginal air dateProd.
codeU.S. viewers
(millions)241"The Man Who Saved Central City"Ralph HemeckerStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Andrew Kreisberg & Gabrielle StantonOctober 6, 20153J56513.58[2]Ronnie and Stein turn into Firestorm and help Barry destroy the singularity, but at the cost of Ronnie's life. Six months later, Barry operates alone, using his speed to repair Central City while being embraced by the public as a hero; Cisco works in the police department alongside Joe, and Caitlin works at Mercury Labs. Barry evaluates a crime scene with a victim named Al Rothstein. At a ceremony, the Flash is attacked by Atom-Smasher, whose strength and size manipulation prove too much for Barry, but manages to force his mask off. Underneath the mask Atom-Smasher is revealed to look exactly like Rothstein. Barry is convinced by Joe and the others that he needs help in taking down certain metahumans and Rothstein is defeated by over absorbing radiation. As he dies, Rothstein tells Barry that he was sent to kill him by someone called "Zoom". Barry receives a flash memory from Harrison Wells' (Eobard Thawne) lawyer containing his confession to killing Nora. Henry is exonerated and released from prison, and leaves Central City so that Barry can focus on being the Flash. A man arrives at S.T.A.R. Labs and introducing himself as Jay Garrick, tells the team their world is in danger.252"Flash of Two Worlds"Jesse WarnAaron Helbing & Todd HelbingOctober 13, 20153J56523.49[3]Jay explains to everyone that he is the Flash on a parallel Earth and that he was in a battle with a demonic speedster named Zoom when the singularity brought him to this Earth without his powers. Stein confirms the claim, describing their world as "Earth-1" and Jay's as "Earth-2". Zoom brings another metahuman from Earth-2 called Sand Demon, later identified as Eddie Slick, to kill the Flash. Cisco analyzes the "sand" left behind and has a vision of the previous fight, frightening him. After Slick kidnaps Officer Patty Spivot, Jay teaches Barry how to hurl lightning. Cisco uses his power to find Patty's location. Barry uses the lightning blast to turn Sand Demon's particles to glass, killing him. Patty reveals to Joe that Mark Mardon killed her father. She joins Joe's metahuman task force. Cisco divulges his ability to Stein, and convinces him not to tell anyone. Stein and Cisco are able to locate 52 breaches with the Earth-2, with the largest one being within S.T.A.R. Labs itself. Joe's estranged wife, Francine, pays him a visit. Stein collapses while talking. On Earth-2 it is revealed that the Harrison Wells of that world is alive and in charge of S.T.A.R. Labs.263"Family of Rogues"John F. ShowalterJulian Meiojas & Katherine WalczakOctober 20, 20153J56533.47[4]Jay creates a device that stabilizes the singularity and will allow him to return home, but he opts to stay to help Barry stop Zoom. Meanwhile, Lisa Snart shows up asking for Flash's help in rescuing Snart, whom she believes was kidnapped. Barry tracks down Snart, who is revealed not to be kidnapped but is working with his father, Lewis. Lisa states that Snart would never work with Lewis willingly, because the latter was abusive toward her when she was a child. Eventually, the team determines that Lewis placed a bomb inside of Lisa and threatened to kill her if Snart did not help him with his theft. Barry infiltrates Lewis' crew with assistance from Snart. Cisco successfully removes the bomb from Lisa, so Snart uses his cold gun to kill his father in retaliation. Snart is incarcerated in Iron Heights and Lisa leaves. Joe reveals to Iris that Francine is alive and a former addict. Stein turns into Firestorm, but with blue flames. Earth-2's Wells arrives at the lab through the breach.274"The Fury of Firestorm"Stefan PleszczynskiKai Yu Wu & Joe PeracchioOctober 27, 20153J56543.43[5]The team is able to temporarily stabilize Stein. Caitlin states that he needs to merge with a new person in order to survive. She identifies two potential candidates: a scientist named Henry Hewitt and a former high school football star named Jefferson Jackson. Hewitt is excited to merge with Stein, but the attempt fails and Hewitt leaves angrily, not knowing that his own metahuman powers have been activated. Jefferson initially refuses, but agrees when Hewitt goes on rampage. After the successful merger, the new Firestorm joins Barry in helping to take down Hewitt, who is incarcerated. Before departing with Jefferson, Stein encourages Cisco to tell the others about his powers. Meanwhile, Francine reveals that she is suffering from a terminal illness and only has months to live. Iris later confronts her for hiding the existence of the former's brother. In the meantime, Wells breaks into Mercury Labs and steals an unknown device. Later, Barry is attacked by a humanoid shark monster sent by Zoom, but is saved by Wells.285"The Darkness and the Light"Steve ShillBen Sokolowski & Grainne GodfreeNovember 3, 20153J56553.87[6]Wells, who Cisco nicknames "Harry" to distinguish him from Thawne, reveals that he is responsible for the creation of the metahumans and Zoom on Earth-2. He states that he plans to help Barry's team stop Zoom and other metahumans. At the same time, a metahuman from Earth-2 called Doctor Light arrives and starts robbing banks. Barry recognizes her as the Earth-2 version of Linda. Later, Light attempts to kill Linda and take over her identity, but accidentally kills Linda's boss and is stopped by Barry's team in the process. Harry reveals Cisco's powers to the team, which Cisco uses to locate Light. Barry defeats her with the help of Harry. After locking Light up, they plan to use her to lure Zoom out and defeat him for good. Jay, who dislikes Harry and vice versa, thinks it is too dangerous and leaves the team. Meanwhile, Barry starts dating Patty while Cisco starts a date with a barista named Kendra Saunders. Cisco picks the nickname "Vibe" for himself. Back on Earth-2, it is revealed that Zoom has Harry's daughter captive.296"Enter Zoom"JJ MakaroGabrielle Stanton & Brooke EikmeierNovember 10, 20153J56563.63[7]As the team works to find a way to stop Zoom, Doctor Light escapes from her containment cell. Instead, the Earth-1 Linda agrees to help the team by impersonating Doctor Light. Barry reveals his alter ego to Linda. Harry creates a speed dampening serum and the team stages a fight at one of the breaches in order to trick Zoom through. The attempt fails, as Zoom knew the plan. Instead, he goes after Linda, before fighting Barry. Zoom is much faster and easily overpowers Barry, showing him defeated with his unconscious body to the local news and the police station before ultimately returning to S.T.A.R. Labs. Zoom stabs Barry with his hand, but Cisco shoots him with the serum, which hurts Zoom, but still leaves him with enough speed to escape. Later, Harry reveals that Zoom has his daughter, Jesse, and that he came to Earth-1 to stop Zoom. Barry wakes from his injuries and discovers that he can no longer feel his legs.307"Gorilla Warfare"Dermott DownsAaron Helbing & Todd HelbingNovember 17, 20153J56573.46[8]Barry manages to recover from the paralysis, but is unable to use his powers due to the psychological trauma of Zoom exposing Barry's defeat to the city. Iris reaches out to Henry, who returns to help Barry overcome his fears. Wells formulates a plan to close all of the breaches, except one, through which Zoom can enter into the trap set for him. Cisco touches Kendra, but leaves after seeing a winged person in a vibe. Grodd returns, using scientists to steal various chemicals in the hopes of creating more gorillas with his level of intelligence. He later kidnaps Caitlin to help him with his plan. Harry dresses up as the Reverse-Flash in order to trick Grodd into thinking that his "father" is still alive. The plan works long enough for Harry to rescue Caitlin before they both escape. After Barry is fully recovered, they lure Grodd to one of the dimensional breaches and send him to a jungle sanctuary for gorillas that have been experimented on in Earth-2. Later, Cisco meets Kendra again, this time vibing and seeing her as the winged figure.318"Legends of Today"Ralph HemeckerStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Aaron Helbing & Todd HelbingDecember 1, 20153J56583.94[9]
Vandal Savage arrives in Central City, seeking to kill Kendra. Barry goes to Star City and enlists the help of Oliver and his team to protect her. The team is visited by Malcolm who informs them that Savage is an immortal. Later, Kendra is kidnapped by Hawkman, but Barry and Oliver rescue her and capture Hawkman, who introducing himself as Carter Hall, tells them he and Kendra are soulmates who have been connected for millennia. The pair are destined to die, be reborn, and find each other in each lifetime. Carter also reveals that Savage has killed the pair several times, each time growing stronger. Savage acquires the Staff of Horus, a deadly weapon. Kendra unlocks her abilities and the team decides to regroup in Central City, where Oliver witnesses Samantha Clayton with her son, who is also his. Meanwhile, Caitlin and Harry create a serum that will temporarily increase Barry's speed so that he can defeat Zoom. Jay initially refuses to test the serum, but changes his mind to save Harry when the latter is shot by an unaware Patty, whom Joe later informs about the truth. However, Jay advises against using the serum on Barry.
This episode begins a crossover event that concludes on Arrow season 4 episode 8. The two episodes also set up Legends of Tomorrow.329"Running to Stand Still"Kevin TancharoenAndrew KreisbergDecember 8, 20153J56593.55[10]Mardon breaks James Jesse and Snart out of Iron Heights in an effort to team up to kill the Flash. Snart declines and alerts Barry. Jesse and Mardon place bombs hidden in Christmas gifts throughout the city, threatening to set them off in family homes if Barry does not sacrifice himself. Wells, Cisco, and Jay find one of the bombs and alter its magnetic polarity; they send it into one of the dimensional breaches, which causes it to attract the remaining bombs, removing them from the city. With them gone, Barry subdues Mardon and Jesse, dissuading Patty from killing Mardon. Meanwhile, Iris and Barry tell Joe about the latter's son named Wally, who later shows up at Joe's. Caitlin and Jay start a romantic relationship. Elsewhere, Zoom is revealed to be sending metahumans in order to help Barry get faster so that Zoom can take the latter's speed force, which Harry reluctantly agrees to help Zoom with because of his daughter, Jesse.3310"Potential Energy"Rob HardyBryan Q. MillerJanuary 19, 20163J56603.41[11]Cisco presents a new idea to slow Zoom down, telling the team about a metahuman, whom he has dubbed the "Turtle", who has the ability to stop the kinetic energy around him and slow everyone to a halt. After Barry fails to stop the Turtle, identified as Russell Glosson, at a diamond unveiling, the team sets a trap at an art exhibit. Barry invites Patty with the intention of telling her his secret, but Glosson is aware of the trap and almost kills Patty before escaping. Later, Glosson kidnaps Patty. The team tracks him down and Barry is able to generate enough speed to move through the kinetic waves to knock him unconscious and save Patty. Patty tells Barry that she is leaving Central City and Harry kills Glosson by extracting a portion of his brain matter. Meanwhile, Joe struggles to develop a relationship with Wally, who has been street racing in an attempt to earn enough money for Francine's medical bills. Caitlin discovers that Jay is dying of an illness caused by Zoom stealing his speed. They vow to stop Zoom to get Jay's speed back in order to cure Jay.3411"The Reverse-Flash Returns"Michael A. AllowitzAaron Helbing & Todd HelbingJanuary 26, 20163J56613.71[12]The team discovers Turtle's death and Jay suspects Harry. Cisco asks Harry for help in controlling his vibing abilities. The latter determines they are connected to Cisco's fear response and triggers a vibe which alerts the team that Eobard Thawne is back. Harry surmises that this version of Thawne is from a point in the future before he went back in time to kill Nora and was protected from being erased. Cisco has a vibe of the future, and the team learns that Thawne is planning to use tachyons to return to his time. Barry arrives and destroys the machine. After a race around the city, Barry stops Thawne and imprisons him at the particle accelerator. However, his capture causes a rupture in the timeline that threatens to kill Cisco, so Barry sends Thawne back to the future to save his friend. Meanwhile, Patty discovers Barry is the Flash but, when he refuses to acknowledge it, she chooses to leave the city. Iris learns that Francine's death is imminent and reconciles with her. Wally takes her advice to do the same.3512"Fast Lane"Rachel TalalayStory by : Brooke Eikmeier
Teleplay by : Kai Yu Wu & Joe PeracchioFebruary 2, 20163J56623.66[13]Right before the particle accelerator explosion, Joey Monteleone was thrown into a tar pit and left for dead. Sealed away, he is freed two years later with the ability to turn his body into molten tar. He sets out to get revenge on those who attempted to kill him. Harry creates a device to siphon Barry's speed energy and attaches it to his suit. It steals a portion of Barry's speed. Wells gives the energy to Zoom, who demands the rest. Meanwhile, Wells and Barry also successfully find a way to close the breaches. While going after Joey, Iris is injured when Barry is too slow to save her. Wells tells the team about the device, asking to be returned to Earth-2 and have Barry seal the breaches so Zoom cannot re-enter. After stopping Joey, Barry informs Wells that the team will help the latter to save Jesse. In the meantime, Wally continues racing even after Francine's death.3613"Welcome to Earth-2"Millicent SheltonStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Katherine WalczakFebruary 9, 20163J56633.96[14]Before heading to Earth-2, Barry closes all but one of the breaches, which is at S.T.A.R. Labs. Using the last breach, Barry, Cisco, and Harry travel to Earth-2, but an energy surge destabilizes the breach and the trio get stuck on Earth-2. Barry decides to impersonate his doppelgänger to get more information on Zoom. He later meets the Iris and Joe of Earth-2 and learns that Iris, who is his doppelgänger's wife, works for the CCPD while Joe is a singer. Barry is attacked by Earth-2's Caitlin and Ronnie, known as Killer Frost and Deathstorm respectively. Joe is killed in the attack. Cisco attempts to help the police stop the pair, but is confronted by his own evil doppelgänger, known as "Reverb" and revealed to have greater powers, including control over nervous systems and manipulation of vibrations. Barry arrives and is stopped by Reverb and Deathstorm. Zoom arrives, kills Reverb and Deathstorm for harming the Flash, and then imprisons Barry. Meanwhile, a new metahuman named Adam Fells appears in Earth-1 Central City. Jay tells Caitlin that he invented Velocity-6, which is the real reason why he lost his speed. Caitlin develops Velocity-7, which Jay uses to engage Fells, who escapes.3714"Escape from Earth-2"JJ MakaroStory by : Todd Helbing & Aaron Helbing
Teleplay by : David KobFebruary 16, 20163J56643.90[15]On Earth-2, Zoom issues a demand to Central City to turn in Wells and attacks S.T.A.R. Labs to find Wells and Cisco; but the two escape with Barry-2. The trio updates Iris-2 on what happened with Barry-1. They decide to convince Caitlin-2 to help. After a fight, Caitlin-2 agrees to take the team to Zoom. They arrive and rescue Barry-1 and Jesse, but Zoom shows up too. They are able to escape by the help of Caitlin-2, who keeps Zoom frozen and unable to move, but a third unidentified prisoner, who tries to reveal something about Jay, is left behind. Barry-2 and Iris-2 leave Central City to hide from Zoom. Meanwhile, on Earth-1, Caitlin-1 creates "Velocity 9", which Jay uses to stop Adam, who gets incarcerated in Iron Heights. Caitlin-1 discovers that Velocity 9 can cure Jay. The latter, Caitlin, Iris and Joe stabilize the breach and allow Barry-1, Cisco, Harry, and Jesse to return, but Zoom stabs his arm through Jay and pulls him back through the closing breach to Earth-2.3815"King Shark"Hanelle CulpepperBenjamin Raab & Deric A. HughesFebruary 23, 20163J56653.80[16]While everyone tries to move on, the humanoid shark-monster that Harry stopped, known as "King Shark," escapes A.R.G.U.S. custody and heads for Central City to kill the Flash. John Diggle and Lyla Michaels, the new director, arrive to warn Barry. King Shark, later identified as Shay Lamden, shows up at Barry's home looking for the Flash, tracking Barry's electrical field. A.R.G.U.S. arrives and forces Shay to retreat. Later, Barry forces King Shark to chase him out on the water, where Barry creates an electrified underwater cyclone that subdues the latter, and allows A.R.G.U.S. to imprison him again, with Lyla planning to find a cure. Barry vows to open a breach back to Earth-2 to stop Zoom. Meanwhile, Barry and Wally find it hard to develop a relationship. After Caitlin becomes cold due to Jay's death, Cisco becomes scared that she will become Killer Frost; but she assures him that she is only dealing with her grief. Back on Earth-2, Zoom unmasks as Jay.3916"Trajectory"Glen WinterLauren Certo & Lilah VandenburghMarch 22, 20163J56663.00[17]Barry starts training to get faster so that he can stop Zoom. While out with friends at a club for downtime, Barry and the other club patrons are robbed by an unknown speedster, who then escapes. The speedster turns out to be Eliza Harmon, a Mercury Labs employee who developed Velocity-9 from samples Caitlin gave her to help with Jay's illness. Operating under the alias "Trajectory", Harmon invades S.T.A.R. Labs, imprisons Barry, and demands more V-9. After she threatens Jesse's life, Wells and Caitlin make more of the drug for Harmon, who then speeds off to wreak havoc on the city. Barry manages to stop her before she injects more V-9 into her system. Barry watches as Harmon's speed becomes so intense that her lightning turns blue and she disintegrates. Jesse decides to leave the city to experience the world on her own and stop Wells from doing harmful things just to protect her. Based on what Barry saw from the overuse of V-9, the similarities between Zoom's speed and Jay's sickness, and Cisco's "vibe" (where he sees Zoom unmasked), the team concludes that Jay is Zoom.4017"Flash Back"Alice TroughtonAaron Helbing & Todd HelbingMarch 29, 20163J56673.39[18]Barry travels back in time to when Hartley Rathaway attacked the team,[a] and switches places with his past self, in order to have Thawne help him solve the speed force equation. However, after a Time Wraith follows Barry to the past, Thawne deduces Barry's deception. Barry is able to convince Eobard to help him become faster. The wraith comes to the lab, where Caitlin and Cisco are forced to accept help from Hartley to deter the wraith. Afterward, the Barry from the current time arrives, forcing an explanation of the time travel event. Thawne provides the future Barry with the information about the tachyon technology, so that he can return to his time. As Barry prepares to make the jump through time, the Wraith arrives, forcing the past timeline's Barry to intervene, so that his future self can return. Back in his time, Barry is confronted by the Wraith, but a reformed Hartley arrives with his sonic gauntlets and defeats the wraith. Barry gives Iris a footage of Eddie recorded in the alternate timeline, advising her to move on with her life.4118"Versus Zoom"Stefan PleszczynskiJoe Peracchio & David KobApril 19, 20163J56683.03[19]
Years earlier on Earth-2, a young Hunter Zolomon watches as his father murders his mother and is subsequently sent to an orphanage. In the present day, Barry tests the tachyon accelerator, and is able to enhance his speed four times greater than normal. Barry decides to re-open a breach back to Earth-2, and he believes that Cisco's powers are the key to opening the portals. Meanwhile, Caitlin reveals that Jay's Earth-1 doppelgänger is Zolomon and Wells, shocked to hear this, reveals that Earth-2 Zolomon was a convicted serial killer. Zolomon was receiving electroconvulsive therapy during the explosion, and was one of the many affected. With this revelation, the team confirms that "Jay" is Hunter. Cisco opens a breach, and Zoom immediately appears, chasing Barry back to S.T.A.R. Labs. There, Barry uses images of Zolomon's parents as a distraction to trap him, but Hunter escapes, claiming to be "the darkness". Zolomon kidnaps Wally and demands Barry's speed in exchange for Wally's life. Barry agrees, so Wells siphons all of his speed force, leaving Barry powerless. Zolomon injects the speed force into himself, and he kidnaps Caitlin with his enhanced speed before escaping.
This episode is a crossover with Supergirl season 1 episode 18. During his run sequence at the beginning of the episode, Barry inadvertently opens a breach, which leads to him asking how long he was gone when he gets back to S.T.A.R. Labs. The events of the Supergirl episode "World's Finest" take place during Barry's time in the breach.4219"Back to Normal"John F. ShowalterBrooke Roberts & Katherine WalczakApril 26, 20163J56693.39[20]As Barry adjusts to life without his powers, Wells decides to leave the lab to look for Jesse. Shortly after speaking with her, Wells is attacked and kidnapped by Griffin Grey, believing him to be Thawne, who demands that Wells find a cure for his metahuman abilities. Grey has superhuman strength, but is also aging rapidly. Barry discovers that, when Grey uses his super strength, he accelerates the aging .
production began that July, lasting until April 2017. Alongside Grant Gustin, who reprises his role as Barry Allen, principal cast members Candice Patton, Danielle Panabaker, Carlos Valdes, Keiynan Lonsdale, Tom Cavanagh, and Jesse L. Martin return from the second season.
The first episode of the season premiered on The CW on October 4, 2016, and was watched by 3.17 million people, with the season consisting of 23 episodes. The series was renewed for a fourth season on January 8, 2017.[1]
EpisodesEdit
See also: List of The Flash episodes
The Flash season 3 episodesNo.
overallNo. in
seasonTitleDirected byWritten byOriginal air dateProd.
codeU.S. viewers
(millions)471"Flashpoint"Jesse WarnStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Andrew Kreisberg & Brooke RobertsOctober 4, 2016T27.131013.17[2]After preventing his mother Nora's murder, Barry returns with Eobard Thawne to the present and imprisons him in a cage that dampens his powers. In the new timeline, which Thawne dubs "Flashpoint", both of Barry's parents are alive; Joe has a poor relationship with Wally and Iris and is chronically in trouble at work; Cisco is a billionaire tech magnate; and Caitlin is a pediatric ophthalmologist. There is also a new Flash in Central City called Kid Flash, struggling with his own nemesis, Edward Clariss, known as "The Rival". Barry begins losing his memories of the original timeline due to the new timeline becoming permanent. After discovering Kid Flash is Wally, Barry teams up with him and stops Clariss, but Wally is critically injured in the process. Realizing that the new timeline is worse for those closest to him, Barry is forced to let Thawne return to the past and kill Nora, resetting the timeline. Back in the present, Barry learns that the timeline did not reset exactly and Joe and Iris do not talk to each other anymore. Meanwhile, Clariss is confronted by a mysterious voice and finds the message "Alchemy" being scratched into his mirror by an invisible force.482"Paradox"Ralph HemeckerAaron Helbing & Todd HelbingOctober 11, 2016T27.131022.80[3]Barry learns of multiple changes to the timeline: Iris has not forgiven Joe for concealing that her mother was alive, Cisco is angry with him for not altering the timeline to save his dead brother Dante, and he has a new CSI partner, Julian Albert, who does not like him. Barry decides to travel back to fix the damage, but is intercepted by Jay Garrick, who tells him that the timeline never resets exactly and he has to learn to live with his mistakes. Meanwhile, Clariss has visions of "Flashpoint" and locates the person responsible, Alchemy, who restores Clariss' powers and memories. Barry tells the team about the timeline's alterations before confronting Clariss at an abandoned warehouse. Alchemy is there as well, saying that he is preparing for a future event. Cisco arrives and helps Barry defeat Clariss, who is then incarcerated in Iron Heights. The team determines Alchemy is creating other metahumans from "Flashpoint" whom they need to track down. Cisco and Barry reconcile, as do Iris and Joe. Caitlin is secretly revealed to have cryokinetic powers. Inside his cell, Clariss is confronted by the voice of Alchemy for his failure before being killed by an unidentified metallic being.493"Magenta"Armen V. KevorkianJudalina Neira & David KobOctober 18, 2016T27.131032.67[4]Harry and Jesse return to Earth-1, where she reveals she has gained super speed from the second dark matter blast. Harry hopes everyone will dissuade her from using her powers. Elsewhere, foster child Frankie Kane develops metahuman magnetic powers that manifest as an alternate personality, Magenta, who attacks her abusive foster father. Julian confronts Frankie at the station and is nearly killed by Magenta. Barry learns from Magenta that she got her powers from Alchemy. She escapes and later goes to the Central City Hospital to kill her foster father by dropping an oil tanker on the building. Barry creates a vortex to hold the tanker in place, but is unable to confront Magenta simultaneously. Wells sends Jesse to help. She takes over the vortex while Barry talks Kane into gaining control over Magenta. Wally, grappling with disappointment over having no speed, realizes he is having the same dreams from "Flashpoint" that Kane describes. Wells tells Jesse that he will support her decision and presents her with her own speedster costume. Joe later shows Barry and Julian footage of Clariss being killed in his cell by an unseen force, manifesting only as a flying ball of white light.504"The New Rogues"Stefan PleszczynskiBenjamin Raab & Deric A. HughesOctober 25, 2016T27.131042.80[5]Three years ago, Sam Scudder and Rosalind Dillon, former cohorts of Leonard Snart, were caught in the original particle accelerator explosion. In the present, Barry begins training Jesse on how to use her powers. Harry suggests the team locate a doppelgänger of his from another Earth to replace him on the team once he and Jesse leave. Scudder returns from being trapped in a mirror-like dimension with the ability to transport himself and others through reflective surfaces. He reunites with Dillon, who now has vertigo-inducing powers, and they go on a crime spree. Barry and Jesse (as "Jesse Quick") confront them, but are defeated after Barry ends up trapped inside a mirror by Scudder. Caitlin secretly uses her emerging ice powers to help Barry free himself from his predicament. He and Jesse then successfully capture Scudder and Dillon. After evaluating the candidates, the team recruits the friendly and eccentric H. R. Wells of Earth-19, despite Harry's misgivings. Jesse and her father then return to Earth-2, but not before Harry apprises Cisco of Barry's suspicious escape. That night, Caitlin accidentally freezes the water in her shower and her appearance begins showing signs of her Earth-2 doppelgänger, Killer Frost.515"Monster"C. Kim MilesZack StentzNovember 1, 2016T27.131052.77[6]Without informing the others, Caitlin visits her estranged mother, Carla, at her medical research company to have her powers examined, but leaves after viciously attacking another scientist who intended to exploit her condition. Meanwhile, a gigantic creature repeatedly appears and disappears on the streets of Central City. Cisco grows suspicious of the newly-recruited H. R. when he does not provide much help in battling the monster. The monster is revealed to be simply a hologram operated by a bullied 15-year-old boy wanting to create fear in others. Barry exposes the deception in time to keep police snipers from harming civilians and prevents Julian from shooting the boy, whom he mistakes for a metahuman. H. R. is revealed to have no technical knowledge at all. He admits that he is only an "idea man" for his tech company on Earth-19 and that he came to Earth-1 primarily to get material for a novel. The team decides to give him a chance to prove his worth as an assistant. A badly shaken Julian reconciles his differences with Barry. Carla informs Caitlin that her powers are increasing and that she needs to stop using them or her condition will become irreversible.526"Shade"JJ MakaroEmily Silver & David KobNovember 15, 2016T27.131063.01[7]When Wally relates his recent dreams of being Kid Flash, Barry reveals what happened to him during "Flashpoint". A metahuman H. R. nicknamed "Shade" appears and murders a stockbroker. Caitlin reveals her powers to Cisco and has him "vibe" her future. Cisco sees himself fighting Killer Frost, causing Caitlin to contemplate leaving for good. Alchemy summons Wally to him, so the team locks Wally in the particle accelerator for his own safety. Meanwhile, Barry and the others stop Shade's next attack and capture him. Cisco forces Caitlin to reveal the truth to the team and Barry privately confesses to her that her powers are a result of "Flashpoint". Wally volunteers to lead the team to Alchemy to capture the villain and stop the memories, which are causing him pain. Barry, Joe, and a S.W.A.T. team locate Alchemy and his followers and surround them. The metallic being that killed Clariss appears and attacks them, revealing himself to be a speedster that only Barry can see. As Barry fights their attacker, Alchemy entices Wally to pick up his fallen energy weapon, which encases Wally in a crystal cocoon. Calling himself "Savitar", the speedster overpowers Barry and prepares to stab him with a blade from his arm.537"Killer Frost"Kevin SmithStory by : Judalina Neira
Teleplay by : Andrew Kreisberg & Brooke RobertsNovember 22, 2016T27.131072.95[8]Savitar opts to drag Barry across the city, while battering him to demonstrate his superiority. Cisco and Caitlin arrive to rescue Barry and Savitar flees. Caitlin, with her Killer Frost persona having taken over, violently interrogates one of Alchemy's followers at CCPD headquarters. When Julian catches her, she coerces him to find the other acolytes so they can lead her to Alchemy, who can presumably remove her powers. Barry and Cisco track her down and imprison her, but the team is fractured after she reveals Barry's role in Dante's death by creating "Flashpoint." Greatly concerned and disregarding the consequences, Joe breaks Wally out of the cocoon. Wally emerges with unmanageable speed powers and he races away in a confused state. Barry offers his life to Caitlin for her freedom in a successful attempt to restore her sanity and gain her help in treating Wally. Joe and Barry locate Wally, stabilizing his condition with Caitlin's serum, and Wally soon embraces his new abilities. Julian agrees to protect Caitlin from the police, but forces Barry to resign from the CCPD in exchange, believing him morally unfit for wanting Caitlin shielded. Julian is later revealed to be Alchemy and working for Savitar.548"Invasion!"Dermott DownsStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Aaron Helbing & Todd HelbingNovember 29, 2016T27.131084.15[9]
Barry investigates a meteor crash outside Central City that turns out to be a spaceship from which aliens emerge. Lyla tells the team that the "Dominators" landed previously in the 1950s, but then mysteriously departed. Needing help, Barry assembles the original Team Arrow, Thea Queen, the Legends, and Supergirl. The team begins training at a S.T.A.R. Labs facility, sparring against Supergirl to prepare for combat against the aliens. Cisco reveals a message to Rip Hunter from Barry's future self, which exposes Barry's manipulation of the timeline and how it affected other team members. Oliver, Supergirl, Felicity, Martin, and Jefferson are left as the only ones who still trust Barry. The Dominators abduct the President. Supergirl leads most of the others in a rescue effort, but the Dominators kill the President and ensnare everyone with a mind control device. The controlled heroes return and attack S.T.A.R. Labs. While Oliver holds them off, Barry lures Supergirl to the device and manipulates her into destroying it, freeing everyone. The team decides to trust Barry again. Suddenly, Sara, Ray, Diggle, Thea, and Oliver are teleported away before Barry can intervene.
This episode begins a crossover event that continues on Arrow season 5 episode 8 and concludes on Legends of Tomorrow season 2 episode 7.559"The Present"Rachel TalalayStory by : Aaron Helbing & Todd Helbing
Teleplay by : Lauren CertoDecember 6, 2016T27.131093.14[10]Barry asks Jay Garrick for help against Savitar. The two heroes locate and defeat Alchemy and return his weapon to its box, causing Savitar to disappear before he can kill Jay. Discovering Julian to be Alchemy, Barry reveals his own identity to him to get further information. Julian relates how he located the Philosopher's stone following a vision of his dead sister and that he has been having blackouts ever since. Savitar manifests through Cisco using visions of Dante and fights Barry and Wally, but Caitlin manages to convince Cisco to close the box again. The team communicates with Savitar through Julian, who claims that Barry, in the future, will imprison him. He also says that one teammate will betray them, one will fall, and a third will suffer a fate worse than death. Trying to end Savitar's threat, Barry and Jay throw the box into the speed force but, in the process, Barry is thrown five months into the future and witnesses Savitar killing Iris. Jay tells Barry that the future is not fixed. Wally is given his own "Kid Flash" costume, Julian gets Barry's job back for him, and Barry rents a new apartment for himself and Iris.5610"Borrowing Problems from the Future"Millicent SheltonGrainne Godfree & David KobJanuary 24, 2017T27.131102.72[11]Barry has been having nightmares about Iris's murder. Jared Morillo attempts a robbery, but is confronted by Barry, who recalls a news report during his visit in the future when Barry captures Plunder. The distraction allows Morillo to overpower Barry and escape. H. R. launches the museum, but no one visits it. In a second confrontation, Wally intervenes and captures Morillo, gaining praise by everyone except Barry. He eventually reveals the future he saw to everyone but Joe. The team decides to change the course of other events in order to prevent Iris's death. Using Cisco, Barry accesses the future memory, in which the news reveal that the S.T.A.R. Labs museum will close and Caitlin will become Killer Frost. Morillo escapes, and Barry decides to change the first event by letting Wally capture him. Cisco relaunches the museum, starting with an exhibition for elementary school students. Julian is persuaded by Caitlin to join the team. A mysterious woman from another Earth arrives, searching for H. R.5711"Dead or Alive"Harry JierjianStory by : Benjamin Raab & Deric A. Hughes
Teleplay by : Zack StentzJanuary 31, 2017T27.131113.06[12]An Earth-19 bounty hunter named Gypsy, possessing powers similar to Cisco's, arrives on Earth-1 intending to take H. R. back to Earth-19 for trial and execution, as inter-dimensional travel is forbidden there. Cisco demands a trial by combat for H. R.'s life, which she accepts. As the duel is to the death, Barry and H. R. try to ambush Gypsy to save Cisco, but she easily defeats them. Meanwhile, determined to leave a legacy, Iris persuades Wally to help her bust an arms dealer. While he is out scouting, she confronts the dealer, seemingly unafraid of death. Wally manages to save her. Julian discovers a flaw in Gypsy's fighting style. Cisco exploits this weakness during their battle, which allows him to defeat her. Cisco spares Gypsy's life, but she makes it clear that H. R. can never return to Earth-19, since she will state that she killed him. Joe gets angry with Iris and is suspicious of her lack of fear. Barry plots to have Wally increase his speed so that Wally can save Iris from Savitar.5812"Untouchable"Rob HardyBrooke Roberts & Judalina NeiraFebruary 7, 2017T27.131122.91[13]Barry and Wally continue their training in order to save Iris from Savitar. They race against each other, and Barry wins by phasing through a building. Julian finds a decayed corpse that was murdered just eight hours ago. He informs Joe that this is surely the work of a metahuman. The body is taken to S.T.A.R. Labs for investigation, where Caitlin and Julian observe it turning to ash. Iris confesses to Barry that she is afraid of her future. Clive Yorkin, the metahuman responsible for the disintegrated corpse, attacks Joe and is revealed to be targeting the police who arrested him in Flashpoint. The metahuman tries to disintegrate a bridge on the train Joe is on, forcing Barry to phase the train through the wreckage of the bridge. Barry teaches Wally how to phase, which Wally uses to expose the meta to his blood and strip him of his powers. Joe insists that everyone be honest with him from now on after learning of Iris's future death. While practicing phasing, Wally is shocked to see Jesse coming through a portal. Jesse says her father has been abducted by Grodd and taken to Gorilla City.5913"Attack on Gorilla City"Dermott Daniel DownsStory by : Andrew Kreisberg
Teleplay by : Aaron Helbing & David KobFebruary 21, 2017T27.131132.78[14]Harry is captured while running through the woods. Jesse explains that he was leading an expedition to Gorilla City that was ambushed and killed while Harry disappeared. Barry recalls that in the future Central City will be attacked by gorillas. He, Julian, Cisco, and Caitlin go to rescue him but are captured by Grodd. Speaking through Harry, Grodd asks Barry to help him usurp his master Solovar. Barry agrees to fight Solovar in the arena for the lives of the others and wins, but refuses to kill him. Grodd seizes control of Gorilla City and prepares an invasion of Earth-1. Cisco asks Caitlin to kill him so Grodd cannot open a portal, but she refuses. Barry fakes his death and Grodd removes him from his cage. He resuscitates himself and frees the others, and they return to Earth-1. Jesse and her father reunite and Wally and Jesse recommit to their relationship. Julian asks Caitlin out on a date. Grodd assembles his army with a brainwashed Gypsy at his side.6014"Attack on Central City"Dermott Daniel DownsStory by : Todd Helbing
Teleplay by : Benjamin Raab & Deric A. HughesFebruary 28, 2017T27.131142.87[15]Harry and H. R. clash over their different personalities. Jesse informs her father that she intends to stay on Earth-1 with Wally, which Harry initially tries to prevent. Gypsy attacks Team Flash, but is subdued and revealed to be controlled by Grodd, whose forces have reached the city. Using his powers, Cisco determines that the gorillas will attack the center of town. This turns out to be a distraction for Grodd to abduct a visiting Army general. Barry contemplates killing Grodd as the only way to permanently stop him and also change the future, but Harry encourages him to find another way. Taking control of the general, Grodd attempts a nuclear missile strike on the city. Barry prevents the attack, so Grodd and his gorilla army invade the city themselves. Cisco travels to Earth-19 to ask for Gypsy's help. The speedsters distract the soldiers while Cisco and Gypsy bring Solovar to Earth-1, who defeats Grodd and assumes leadership once again. The gorillas return to Earth-2, with the exception of Grodd, who is turned over to A.R.G.U.S. Gypsy kisses Cisco, before returning to Earth-19. Barry proposes to Iris. While going out to pick up dinner for Jesse, Wally visualizes Savitar confronting him.6115"The Wrath of Savitar"Alexandra La RocheAndrew Kreisberg & Andrew WilderMarch 7, 2017T27.131152.52[16]Wally continues having visions of Savitar and, after a physical altercation with him, finally admits this to the team. The team attempts to question Savitar via Julian, who again acts as a conduit. Savitar casts doubt on whether the Philosopher's Stone is truly lost to the speed force. Caitlin confesses that she kept part of the Philosopher's Stone, hoping to use it to remove her powers. Barry and the team figure out that Savitar is trapped inside the speed force but Wally is at home with Jesse when they realize this. Wally, after being confronted by Savitar who appears as a vision of his mother, steals the stone fragment from the lab, creates a portal, and launches the fragment into the speed force, believing this will exile Savitar for good. Barry arrives just as the portal draws Wally into it, trapping him in the speed force. Savitar, having successfully manipulated Wally, emerges from the speed force and fights Barry, taunting him by boasting he will not kill him before Barry watches Iris die before his eyes. Barry breaks off Savitar's arm blade using his vibrating hand, causing Savitar to retreat.6216"Into the Speed Force"Gregory SmithBrooke Roberts & Judalina NeiraMarch 14, 2017T27.131162.39[17]Feeling responsible for everything bad that is happening, and that Wally is suffering inside the speed force, Barry decides to rescue him. Cisco vibes Barry into the speed force, where he encounters manifestations of friends and foes who had previously sacrificed their lives. Less accommodating than before, they push Barry to understand true sacrifice and that he must be the one to save Iris in the future. Barry is also confronted by his former enemy, Hunter Zolomon, and defeats him. Jay Garrick, having been contacted by Cisco, joins Barry inside the speed force and voluntarily takes Wally's place so Barry and Wally can escape. Meanwhile, Jesse uses the armor shard to locate and face Savitar by herself, managing to wound him with it before he escapes. Later, Jesse decides to go to Earth-3 to protect it until the team can free Jay from the speed force. Barry admits to Iris that even though he does love her, he proposed for the wrong reasons and suggests they take some time apart from one another.6317"Duet"Dermott Daniel DownsStory by : Greg Berlanti & Andrew Kreisberg
Teleplay by : Aaron Helbing & Todd HelbingMarch 21, 2017T27.131172.71[18]
J'onn J'onzz and Mon-El arrive on Earth-1 with a comatose Kara. The Music Meister attacks and places Barry in a similar coma. He wakes up in a musical world and finds Kara. Meister tells them that if they follow the script, they will return to the real world. Barry and Kara are forced to work as singers in a nightclub run by gangster Cutter Moran. Digsy Foss and his husband are two gangsters opposing Moran. Barry and Kara find Moran's son, Tommy, and Foss's daughter, Iris, in a forbidden relationship. Kara and Barry convince the pair to reveal their love, also helping Barry and Kara to realize their own mistakes. Moran, Foss and his husband subsequently decide to go to war. Barry and Kara are shot in the crossfire, but Cisco, Mon-El and Iris vibe into their world to save them, allowing Barry and Kara to admit their loves for Iris and Mon-El. They wake up in S.T.A.R. Labs, and Meister reveals that he just wanted them to realize their love. Kara's team returns to Earth-38, and Barry and Iris move back in together. Barry re-proposes to Iris, who accepts.
This episode is a crossover with Supergirl episode "Star-Crossed".6418"Abra Kadabra"Nina Lopez-CorradoStory by : Andrew Kreisberg
Teleplay by : Brooke Roberts & David KobMarch 28, 2017T27.131182.39[19]Abra Kadabra, a criminal from the 64th century, comes to Central City, stealing from numerous tech companies and killing two guards. Gypsy returns, in pursuit of Kadabra. Kadabra offers the team the identity of Savitar in exchange for his freedom. Against Gypsy's wishes, a desperate Joe releases Kadabra, who escapes to Thawne's time vault after Gypsy fails to stop him and retrieves a power source. Kadabra also triggers an explosion that critically injures Caitlin. Refusing to take off the necklace suppressing her powers, even though doing so could save her life, Caitlin asks Julian to perform surgery with her guidance instead. Kadabra attempts to return to his own time, having used the stolen technology to build his own time machine, but he is foiled by the team with Gypsy's help. Barry decides that the only way to save Iris' life is by traveling to the future. Later, a still-recovering Caitlin loses consciousness and begins convulsing, before her vital signs flatline. A distraught Julian rips the necklace from her neck and her vital signs return to normal, as her injuries heal rapidly. She awakens, but in the guise of Killer Frost, and starts attacking the group with her ice powers.6519"The Once and Future Flash"Tom CavanaghCarina Adly MacKenzieApril 25, 2017T27.131192.67[20]Killer Frost destroys the necklace. Barry travels to 2024, where he learns that Cisco lost his powers after Killer Frost shattered his hands and forced him to use mechanical prosthetics, H. R. has become a successful novelist, Julian works at Iron Heights tending to Killer Frost, Wally is catatonic with a shattered spine, Joe is depressed, and future Barry is a recluse hiding at S.T.A.R. Labs. In his absence, Top and Mirror Master have taken over Central City. Barry fails to learn Savitar's identity. Cisco secretly uses a device to prevent Barry from returning to the past, hoping he will put things right. Barry rounds up Julian, Joe, and H. R., reuniting Team Flash. Top and Mirror Master overwhelm Barry with their powers but, after overhearing him, future Barry uses Cisco's device to negate the villains' abilities, helping to defeat them. Future Barry gives Barry information and tells him to find a physicist named Tracy Brand, who developed a speed force-based trap years after Iris' death. In the present, Killer Frost meets with Savitar. She is reluctant to trust him, but changes her mind when Savitar's armor opens up and he steps out, revealing his identity to her.6620"I Know Who You Are"Hanelle CulpepperBronwen Clark & Joshua V. GilbertMay 2, 2017T27.131202.69[21]Barry, Cisco, and H. R. visit Tracy to seek her help in making a trap for Savitar; they are interrupted by Killer Frost, who attempts to kill Tracy, but is defeated before she escapes. Tracy goes to S.T.A.R. Labs with Team Flash and is shown her future. Killer Frost later decides to kidnap Joe's girlfriend, Cecile, and demand Tracy in exchange. Killer Frost's plan fails, leading to a battle between her and Cisco. Defeated, she is whisked away by Savitar, but not before Cisco draws some of her blood in order to potentially make a cure for her powers. Meanwhile, Joe admits his love to Cecile and tells her about Barry and Wally's alter egos. H. R. develops feelings for Tracy. Later, Tracy, inspired by the events, plans to build a trap for Savitar, while Barry has a revelation regarding Savitar's identity, given how much Savitar knows about everyone, and confronts him outside the city. Savitar confirms Barry's new assumption and reveals himself to be a future version of Barry.6721"Cause and Effect"David McWhirterJudalina Neira & Lauren CertoMay 9, 2017T27.131212.71[22]Savitar explains that he is a time remnant of Barry, created by his future self while fighting Savitar. After being shunned by Team Flash, the time remnant became depressed and ran back in time to ultimately become Savitar. He explains that he needs to kill Iris so that Barry will be forced to create him in the future. Cisco proposes they stop Savitar from remembering any of their strategies by stopping Barry from creating new memories, but miscalculations cause Barry to lose his memory. Savitar also loses all of his memories, resulting in Wally's powers disappearing, since Savitar never gave them to him. A pyromaniac named Lucious Coolidge gets released because of Barry's inability to testify correctly. Killer Frost helps Cisco and Julian develop a way for Barry to regain his memories so that Savitar can, as well. When Coolidge starts a fire, Iris helps Barry regain his memories in time to stop the fire with assistance from Wally. Tracy and H. R. develop a romance. She then shows the team the completed speed force trap, which requires a high amount of energy. The final scene cuts to a room that has an alien power source, as well as King Shark.6822"Infantino Street"Michael AllowitzStory by : Andrew Kreisberg
Teleplay by : Grainne GodfreeMay 16, 2017T27.131222.48[23]With 24 hours left before Iris dies, Team Flash learns that there is only one energy source that can power the "Speed Force Bazooka"; a salvaged Dominator technology held by A.R.G.U.S. However, Lyla refuses to hand it over because of her mistrust of Barry due to his creation of Flashpoint. Barry then recruits Snart from 1892, when he was travelling with the Legends, to help him break into A.R.G.U.S. and steal the device. In the process, A.R.G.U.S. agents capture Barry and Snart, but Lyla, seeing the kindness in Barry's actions, allows him to take the device. Snart advises Barry to use the goodness in him to defeat Savitar. Tracy decides to join the team. Cisco vibes about his battle with Killer Frost and leaves to fight her. Joe hides Iris from Savitar on Earth-2 with Harry and Wally but Savitar tricks H. R. into revealing her location by pretending to be Barry, then goes to Earth-2 and kidnaps her. Barry uses the "Speed Force Bazooka" on Savitar, but it fails when Savitar counteracts it with the Philosopher's Stone, which is made out of calcified speed force energy. Savitar then stabs Iris in the back seemingly killing her, before escaping.6923"Finish Line"David McWhirterAaron Helbing & Todd HelbingMay 23, 2017T27.131233.04[24]H. R. reveals he swapped places with Iris and dies. Realizing his mistake, Savitar kidnaps Cisco and forces him to modify the Bazooka into an "inter-dimensional quantum splicer" that will allow him to disperse himself throughout time and protect him from the paradox that threatens him. Barry meets with Savitar, believing he can be redeemed, and brings him to S.T.A.R. Labs. Savitar rejects Barry and Iris' pleas, wrecks the lab and orders Caitlin to kill Cisco, but Gypsy saves him. Savitar opens a portal into the Speed Force. Zolomon, as the Black Flash, intervenes, but is disposed of by Caitlin. Savitar then attempts to execute his plan. However, Cisco modified the Bazooka into a 'skeleton key' which frees Jay from the Speed Force prison. Barry, Wally and Jay engage Savitar, while Cisco, with Gypsy's help, convinces Caitlin to abandon Savitar. Barry destroys Savitar's armor after phasing into the armor from behind and phasing Savitar out of the armor. Savitar attempts to kill Barry but is then is killed to
Iris has been aiding Team Flash in Central City for six months, but refuses to grieve Barry. A flying samurai with superpowers appears in Central City, threatening to destroy the city if the real Flash does not face him. Cisco reveals he has formulated a way to bring back Barry without destabilizing the Speed Force and tracks down Caitlin for help, but is forbidden by Iris to bring Barry back. Against Iris' orders, Team Flash successfully returns Barry, who rambles random statements and continually writes symbols on the walls. Wally engages the samurai, but is defeated. Cisco deciphers Barry's writings and finds an apparently meaningless sentence. In an attempt to recover Barry's memories, Iris gives herself up to the samurai. The plan works and Barry speeds away, rescuing Iris and defeating the samurai, who is revealed to be an android. Caitlin rejoins Team Flash, but is revealed to have been working for mobster Amunet Black, while also continuing to prevent the Killer Frost personality from emerging. The "Samuroid" is revealed to have been controlled by a supremely intelligent man in a superpowered wheelchair, whose plan was to draw out the Flash for his next schemes.712"Mixed Signals"Alexandra La RocheJonathan Butler & Gabriel GarzaOctober 17, 2017T27.134022.54[3]When Barry, Joe, and Cisco report to a crime scene, they discover remnants of a mysterious code. Cisco presents Barry with a technologically advanced suit, intended to facilitate his activities. He tests it out, trying to save someone from a haywire car controlled by metahuman Ramsey Deacon. Gypsy arrives on Earth-1 for a date with Cisco, who is forced to cancel it so as to focus on Deacon. Acting on a suggestion from Caitlin, Iris signs her and Barry up for couples therapy to sort out their relationship. Deacon kidnaps a witness, a former member of a tech team that stole his idea for profit. Barry and Wally go to save him, but Deacon uses his abilities to send Barry's suit haywire. On Iris' instruction, Barry throws lightning at himself, shorting out his suit. He then incapacitates Deacon, who is locked up in the meta wing of Iron Heights, revealed to be part of the intelligent man's plan. Cisco finally goes out with Gypsy. Wondering how Deacon gained his powers being absent during the particle accelerator explosion,[a] Barry and Joe learn from Deacon that there are "others."723"Luck Be a Lady"Armen V. KevorkianSam Chalsen & Judalina NeiraOctober 24, 2017T27.134032.62[4]In flashbacks, the intelligent man observes Becky Sharpe, a woman with unending bad luck, and determines that she will be easily manipulated. In the present, Becky robs a bank and gets away when Barry slips on marbles. Harry arrives from Earth-2 and tells Wally that Jesse has decided to break up with him to focus on her vigilantism. Cisco deduces that Becky is a metahuman with the power of favorable luck while inducing misfortune to others. Barry realizes that the portal he used to escape the Speed Force exposed an entire busload of people, including Becky and Deacon, to transformative dark matter. Harry informs Cisco that Jesse has expelled him from her crime-fighting team due to his attitude. Becky's powers expand out of control, reactivating the particle accelerator, which Harry deliberately allows, nullifying Becky's powers and leading to her incarceration. Cisco and Harry identify twelve new metahumans created on the bus and the latter suspects that an unknown party has manipulated the events surrounding Barry's return. Wally decides to leave on a journey to find himself. The intelligent man is revealed to be spying on S.T.A.R. Labs through the "Samuroid" helmet. Joe learns Cecile is pregnant.734"Elongated Journey Into Night"Tom CavanaghSterling Gates & Thomas PoundOctober 31, 2017T27.134041.99[5]Gypsy's father, Breacher, attacks Cisco, vowing to hunt and kill him in 24 hours, but allowing the romance should he survive. Team Flash learns that the bus driver was murdered and tracks down another passenger, Ralph Dibny, a former corrupt CCPD detective who Barry exposed that is now a private investigator. As two thugs attack Dibny, he is revealed to have the power to stretch. Caitlin stabilizes his powers with a serum. The team learns that Ralph has been blackmailing Mayor Anthony Bellows over his adultery, so the latter hired the thugs. Barry confronts Ralph for his actions, but Ralph maintains he was a "good cop." He later stops blackmailing Bellows, who still attempts to kill him while Breacher mistakes the former for a Plastoid, the species that invaded Earth-19 previously, and attacks him. Cisco intervenes and saves Ralph, whom Barry, having revealed his alter-ego, convinces to help arrest an escaping Bellows. Admiring Cisco's gallantry, Breacher allows the relationship. Barry recruits Ralph for Team Flash and learns that someone named DeVoe instructed Ralph to watch Bellows. Barry remembers that Abra Kadabra and Savitar both mentioned a DeVoe. Meanwhile, Caitlin finds a message on her apartment door.745"Girls Night Out"Laura BelseyLauren Certo & Kristen KimNovember 7, 2017T27.134052.38[6]While failing to track DeVoe, Team Flash is visited by Felicity, who joins Iris' bachelorette party. Mocking Cisco's plans for Barry's bachelor party, Ralph takes the men to a strip club, where they find Cecile's daughter, Joanie, working. Joe confronts her, but she states that she is only doing feminist research. Ralph incites a brawl, leading to the men's arrest until Harry posts bail. Meanwhile, Amunet's enforcer, Norvok, demands Caitlin's return and attacks the women when she refuses. Killer Frost emerges and repels him, later telling Iris that Caitlin accepted Amunet's employment in exchange for the means to control Frost. Learning that Amunet is holding a metahuman she calls the "Weeper", whose tears are a strong narcotic, prisoner and intends to sell him, Iris' party decides to stop her. Though Caitlin refuses to join, she attacks Amunet when seeing her friends in danger. Using a strong magnet, the team robs Amunet of her metal shards, leaving her powerless. Iris dissuades Frost from killing Amunet, who promises revenge. Both parties refuse to tell each other about their adventures. Iris asks Caitlin to be her maid of honor while Joe convinces Joanie to tell Cecile about her research. The intelligent man captures the Weeper.756"When Harry Met Harry..."Brent CrowellJonathan Butler & Gabriel GarzaNovember 14, 2017T27.134062.46[7]Barry trains Ralph to use his abilities, with Cisco making a stretchable suit for him. Another bus metahuman, a Lakota Sioux Native named Mina Chaytan who can animate statues, starts attacking Central City and stealing pieces of a Black Bison necklace, which she claims belongs to her tribe. When Barry and Ralph catch up to her, she attacks Barry with a caveman statue and attempts a getaway. Ralph chooses to stop her, but a little girl is injured in the process. Ralph regrets his actions, but is comforted by Barry. Chayton escapes CCPD, going after the last necklace piece held at the museum. When Barry and Ralph confront her, she brings a dinosaur skeleton to life. Barry arrests Chayton while Ralph saves a security guard from the skeleton. Later, Ralph reveals he mailed the necklace back to Chayton's tribe before visiting the little girl in the hospital, using his abilities to entertain her. Meanwhile, Harry, trying to make friends, works with his doppelgangers from alternate Earths, dubbed The Council of Wells. They deduce that DeVoe is a man named Clifford DeVoe. Barry and Joe head to DeVoe's house, but find a middle-aged man in a wheelchair.767"Therefore I Am"David McWhirterEric Wallace & Thomas PoundNovember 21, 2017T27.134072.20[8]Barry and Joe interrogate DeVoe and his wife Marlize to try and get more information. In flashbacks, DeVoe and Marlize build a thinking cap to improve his brain capacity, powering it through the particle accelerator explosion. DeVoe's increased brain power accelerates his amyotrophic lateral sclerosis, forcing his wife to build him a special chair to keep him alive. Barry discovers the camera in the Samuroid head and goes to DeVoe's house, narrowly avoiding being caught by DeVoe's wife. Barry later confronts DeVoe, who reveals his true identity, leading to Cisco dubbing him "The Thinker." Wally returns to Team Flash from Blue Valley.778"Crisis on Earth-X, Part 3"Dermott DownsStory by : Andrew Kreisberg & Marc Guggenheim
Teleplay by : Todd HelbingNovember 28, 2017T27.134082.82[9]
Barry, Oliver, Sara, Alex, Martin and Jax wake up in a Nazi concentration camp on Earth-X wearing power dampeners. The arriving SS Sturmbannführer is revealed to be the Earth-X doppelgänger of Quentin Lance, who plans to execute them, but they are saved by Leo Snart (the Earth-X doppelgänger of Leonard Snart) and Ray Terrill. Snart and Terrill take them to the headquarters of the Freedom Fighters, where the team meets the resistance movement's leader, General Schott (Winn Schott's Earth-X doppelgänger). They learn that the only way back to Earth-1 is through a temporal gateway in a research facility, which Schott plans to blow up to strand Dark Arrow (Oliver's Earth-X doppelgänger) on Earth-1. Oliver disguises himself as Dark Arrow to infiltrate the facility and discovers the Nazis have a contingency plan, a militarized timeship called Wellenreiter. Barry and Ray battle the Freedom Fighters' Red Tornado to stop it from destroying the gateway while the rest of the team enter the facility to reactivate its portal. During the battle, Stein is shot and gravely wounded. On Earth-1, Eobard Thawne prepares to perform surgery on Kara to save Overgirl. Felicity and Iris try to stop him, but are captured.
This episode continues a crossover event that begins on Supergirl season 3 episode 8 and Arrow season 6 episode 8, and concludes on Legends of Tomorrow season 3 episode 8.789"Don't Run"Stefan PleszczynskiSam Chalsen & Judalina NeiraDecember 5, 2017T27.134092.22[10]While out Christmas shopping, Barry is ambushed and kidnapped by DeVoe while Caitlin is kidnapped from Jitters by Amunet. Iris claims they have to look for both of them, despite Harry's claim that they have insufficient time and resources and that they can only afford to search for one. Caitlin is forced by Amunet to perform surgery on a metahuman named Dominic Lanse who can read minds. They try to escape, but Amunet blocks their exit. Caitlin manages to briefly incapacitate Amunet, so she and Dominic can flee the building in which they are being held. Once outside, they are rescued by Cisco and Ralph, as Iris chose to focus on finding Caitlin. Barry manages to escape from DeVoe. Team Flash celebrates Christmas at the West house and Dominic joins them. Barry gets a security alert from his apartment. When he arrives, he receives a phone call from Dominic, who reveals that Amunet re-kidnapped Dominic and DeVoe transferred his consciousness into Dominic's body. Barry discovers DeVoe's original body dead on his apartment floor and realizes DeVoe has framed him for his "murder;" the police arrive and Barry lets himself get arrested, not wanting to leave Iris again.7910"The Trial of the Flash"Philip