In a 'Star Wars Supergirl Crossover Fanfiction', the story could start with a distress signal from a far - flung planet in the Star Wars universe that only Supergirl can detect due to her super - senses. When she arrives, she discovers that the planet is under the control of a powerful Dark Side user who has enslaved the population. Supergirl decides to fight against this tyranny. She teams up with local resistance fighters, some of whom have latent Force abilities. Together, they train and strategize to take on the Dark Side user and his minions, with Supergirl being the key to victory because of her invulnerability and super - speed.
One possible plot could be that Supergirl, through some sort of inter - dimensional rift, ends up in the Star Wars universe. She might team up with the Rebel Alliance. Her superpowers would be a great asset against the Empire. For example, she could easily take down Imperial starships with her heat vision or super strength. Maybe she'd have to learn to use a lightsaber too, which would be an interesting addition to her powerset.
Well, the plot could involve a Sith Lord getting hold of Kryptonian technology and trying to use it to enhance the Sith's power. Supergirl then travels to the Star Wars galaxy to stop this. Along the way, she meets Jedi like Luke Skywalker. They join forces, with Supergirl teaching the Jedi about her unique powers and the Jedi teaching her about the Force. It could lead to an epic battle between the combined forces of the Jedi and Supergirl against the Sith and their new - found Kryptonian - enhanced power.
Darth Vader could be a great main villain. His dark power and iconic status in Star Wars would make him a formidable foe for Supergirl. He could see her as a threat to the Empire's rule and try to eliminate her. His mastery of the Force and lightsaber skills would put Supergirl in a tough fight, especially if she's not familiar with the ways of the Force at first.
One possible plot could be that the Terminators are sent back in time to the Star Wars universe. Maybe they are sent by some future evil force to disrupt the balance of the Force. The Jedi would then have to figure out how to deal with these mechanical threats that are not affected by the Force in the traditional sense. They might try to use their lightsabers to cut through the Terminators, but find that it's not as easy as they thought.
Well, it could be that Venom somehow gets transported to the Star Wars universe. Maybe he lands on a planet like Tatooine and causes chaos among the local gangs. The Sith could be interested in his power and try to control him, but Venom is too wild. And the Jedi might sense his dark presence and have to decide whether to destroy him or try to redeem him.
One possible plot could be that Ben Tennyson and his Omnitrix somehow get transported to the Star Wars galaxy. Ben might team up with the Jedi to fight against the Sith. His alien forms could provide unique combat abilities in the Star Wars universe. For example, Four Arms could be a powerful physical fighter against stormtroopers, and Heatblast could deal with enemies in hot environments like Tatooine's deserts.
A plot could center around a lost Star Wars character ending up in the Sekirei world. This character, perhaps a young Jedi in training, has to find a way back home. In the process, they befriend a Sekirei and start to understand their way of life. Meanwhile, back in the Star Wars galaxy, the Sith sense an unusual power shift due to the connection between the two worlds. They send agents to the Sekirei world to investigate and try to disrupt the harmony there. The young Jedi and their Sekirei friends must then work together to stop the Sith and also find a way to reopen the portal to send the Jedi home.
A plot could involve a conflict where the Covenant from Halo somehow gets involved in the Clone Wars. The Clone troopers and the Jedi would have to figure out how to fight this new and strange enemy. The story could explore how the different powers and abilities in both universes interact. For example, the Force versus the Spartans' enhanced physical abilities. It could also show how the Jedi Council reacts to the arrival of these unknown warriors from another dimension.
A really interesting plot could be a time - traveling crossover. Supergirl goes back in time to the era of the original Avengers. She helps them in a battle that changes the course of history. In return, the Avengers help her find a way back to her own universe. During this time, she forms a special bond with Thor, as they both have superhuman strength and a connection to otherworldly powers.
Well, one possible plot could be that Supergirl accidentally lands in the Naruto universe. Naruto, being the curious and friendly ninja he is, approaches her. They initially have a misunderstanding due to their different worlds and powers, but then they realize they can learn from each other. Supergirl could teach Naruto about her advanced technology from her world, while Naruto could show Supergirl the unique chakra - based powers and the ninja way of life.
One possible plot could be that the Combine from Half - Life somehow make their way into the Star Wars universe. Gordon Freeman could team up with a group of Jedi. Maybe the Combine are after the Force - sensitive individuals in the Star Wars galaxy, thinking they can use the Force for their own evil purposes. Gordon Freeman uses his scientific knowledge and his HEV suit to help the Jedi understand the technology of the Combine and they fight together to stop the Combine invasion.
One possibility could be that the Jedi and the members of the Justice League team up to fight a common enemy. For example, a powerful Sith Lord who has somehow made his way to the DC Universe and is causing chaos. The Jedi's use of the Force combined with the superpowers of the Justice League members like Superman's strength, Batman's strategic mind, and Wonder Woman's combat skills would make for an epic battle.