A plot where Supergirl's powers are somehow linked to the Infinity Stones could be really cool. The Avengers need to figure out how to use her powers in relation to the Stones to defeat an enemy who is also after the Stones' power. This would create a complex and exciting story with lots of action and mystery.
Maybe a story where the Avengers are transported to Supergirl's universe. They have to adapt to her world's rules and help her fight against a powerful villain there. This could involve a lot of world - building and character development as the Avengers learn about Supergirl's allies and enemies.
One idea could be that Batman and Supergirl team up to stop a powerful alien threat that is beyond the capabilities of either of them alone. They start off distrusting each other due to their different methods, but as they face challenges, they learn to work together and respect one another's skills.
One idea could be exploring what if Loki had an unexpected ally within the Avengers. Maybe a character who was initially on the heroes' side but got swayed by Loki's charm or promises.
One idea could be that Flash and Supergirl team up to stop a powerful alien villain who is causing chaos across both their cities. The villain could have the ability to manipulate time and space, which would make it a real challenge for the two heroes.
One plot idea could be that the Inhumans' city of Attilan is in danger and the Avengers are called in to help. The Inhumans are initially hesitant to accept their aid due to their differences, but they soon realize they need to work together. Another idea is a young Inhuman with a powerful but uncontrollable ability is found by the Avengers. They try to help the Inhuman learn to control it while also protecting them from those who would use their power for evil.
A more complex plot could involve the Flash's speed force interacting with the Infinity Stones. The Avengers might be trying to figure out how to use or contain the power of the speed force in relation to the Stones. This could lead to all kinds of conflicts and alliances within the story, as different characters have different ideas about how to handle such a powerful and unknown combination of forces.
A plot could revolve around the Avengers Prime traveling through time to prevent a future disaster that they somehow caused. Along the way, they meet different versions of themselves and have to make tough decisions about changing the timeline.
One idea could be an imagine where a new superhero joins the Avengers. They have a unique power that the team initially struggles to understand but eventually learns to utilize effectively. For example, a hero with the power to manipulate time on a small scale, like being able to slow down time for a few seconds during a battle.
One could be a Supergirl fanfic about her teaming up with other superheroes from different universes to fight a powerful cosmic villain. It would involve epic battles and interesting character interactions.
Another plot could focus on the relationship between Thanos and his adopted daughters in a more in - depth way in the context of the Infinity Wars. Maybe there was a time when they were planning a rebellion against him before he even started his quest for the Stones. This could add a whole new layer of backstory and drama to the events of the movie.
One idea could be that the Incredibles' superpowers are enhanced by the Avengers' technology. For example, Mr. Incredible could get a high - tech suit from Stark Industries that gives him even more strength and the ability to fly short distances. Another plot could involve the villains from both universes teaming up, forcing the combined heroes to work together in new ways. Maybe Syndrome teams up with Loki, and they create a device that can nullify superpowers, so the heroes have to find a way to stop it.