In a Spiderman worm crossover fanfic, perhaps the worm is from an alien planet and has the power to control earth elements like soil and rocks. When it crash - lands on Earth, Spiderman is initially suspicious. But as he gets to know the worm, he realizes that it's being hunted by some other alien species. So, Spiderman decides to protect the worm and in return, the worm uses its powers to help Spiderman fight crime in a new and unique way.
A possible plot could involve a mad scientist who combines the DNA of a worm with some sort of mutagen that gives it super - human like intelligence and abilities. This new 'worm - creature' starts causing chaos in the city. Spiderman, being the friendly neighborhood hero, investigates. He discovers that the worm - creature is not entirely evil but just confused. So, he tries to help it while also protecting the city from its accidental destruction.
A cool plot could be that a villain creates a device that can manipulate time. This device causes chaos as it starts to merge different timelines. Spider - Man gets caught in the middle of this temporal mess while on a normal patrol in New York. He then reaches out to the Avengers for help. The Avengers, who have experience with time - related issues from previous adventures, team up with Spider - Man. Thor uses his lightning to disrupt the device's power source, while Spider - Man swings in to physically disable it with the help of Black Widow's combat skills. In the end, they manage to restore the timelines and save the day.
One possible plot could be that a new supervillain emerges who has the ability to manipulate time and space. This villain starts causing chaos in both Gotham and New York. Spiderman and Batman initially work separately to figure out what's going on. But as the situation worsens, they cross paths. Spiderman's agility and sense of humor contrast with Batman's brooding and strategic nature. They could learn from each other's fighting styles and eventually team up to defeat the villain.
A cool plot could be that the symbiote from Spiderman's world somehow gets linked to a Hive entity in the Destiny universe. This causes chaos as the combined powers create a super - powerful and evil being. Spiderman has to team up with a Warlock to find a way to separate the two and stop this new threat. The Warlock uses their knowledge of the Darkness and the Light, while Spiderman uses his physical abilities.
Maybe a biologist gone bad. He has been studying the worm and discovers that its cells can be used to create a powerful mutagen that can turn ordinary people into super - strong minions. He plans to create an army and take over the city. Spiderman has to stop him from using the worm in this way. And the worm, being an innocent creature, becomes a key piece in this battle between good and evil.
One idea could be that the X - Men and Spiderman have to team up to stop a powerful mutant - human hybrid villain created by Oscorp. The X - Men bring their diverse powers and experience in dealing with mutants, while Spiderman adds his acrobatic skills and street - level intelligence. They start off distrusting each other, especially with some of the X - Men being wary of Spiderman as a non - mutant, but as they face challenges together, they learn to work as a team.
One possible plot could be a trainer in the Pokemon world discovers a strange worm - like Pokemon that has abilities never seen before. This Pokemon could be a key to unlocking a hidden power within the region that an evil team is also after. The trainer has to protect the worm - like Pokemon and use its unique powers to defeat the bad guys.
How about a plot where the Joker teams up with one of Spider - Man's villains, say, the Green Goblin? They plan to create a new type of toxin that can drive people insane and also give them super - strength. The toxin starts to spread in both Gotham and New York. Batman and Spider - Man start to investigate separately at first. But as they realize the connection between the two villains and their plan, they join forces. Batman uses his intellect to analyze the toxin and find an antidote, while Spider - Man uses his speed and webs to stop the villains from spreading more of it. In the end, they manage to save both cities and put the villains behind bars.
A possible plot could be that there is a threat to the world that involves both superpowers and high - tech espionage. The Totally Spies are called in to investigate the technological aspect, while Spiderman is already on the scene dealing with the super - powered part of the threat. They cross paths and at first are not sure if they can trust each other. But as the situation worsens, they realize they need to work together. They combine their unique skills, like Spiderman's web - slinging and the Totally Spies' ability to blend in and use advanced gadgets. In the end, they defeat the common enemy.
In a Naruto and Spiderman crossover, it could start with Spiderman noticing some strange energy signatures in his city. These turn out to be Naruto's chakra flares. Naruto is there looking for a way back to his own world after being accidentally sent to Earth - 616 (the Marvel Universe). They meet and at first don't understand each other. However, when they see a common enemy, a group of ninjas - like mutants who are causing chaos, they decide to work together. Spiderman uses his agility and web - shooting while Naruto uses his jutsu to defeat the bad guys.
A possible plot is that the RWBY characters end up in New York. Ruby, with her speed and scythe skills, is initially mistaken for a threat by Spiderman. But when they realize they are both on the side of good, they join forces. Weiss could use her glyphs in new and creative ways in the urban environment, Blake's stealth and acrobatic skills could be put to great use, and Yang's strength would be a valuable asset. Together they take on a criminal organization that has somehow gotten hold of some Dust and is using it for evil purposes.