Well, it could start with Lex Luthor and Loki teaming up. Luthor figures out a way to open a portal to the Marvel universe and sends Superman through it as part of his evil plan. Superman lands in New York and the Avengers are on high alert. Thor recognizes Superman's power as something otherworldly. Eventually, they figure out Luthor's plan and decide to join forces. They travel back to the DC universe through the portal and together they take on Luthor and Loki. Superman and Hulk could have an epic battle of strength in the process, and Iron Man and Batman could work together on the technological side to stop the villains' evil scheme.
One possible plot could be that Superman is somehow transported to the Marvel universe where the Avengers operate. He initially clashes with them due to misunderstandings. For example, his super strength might be seen as a threat. But then they realize they can team up to fight a common enemy, like a powerful alien or a super - villain who has the ability to manipulate time. They combine Superman's powers such as heat vision and flight with the Avengers' diverse skills like Iron Man's technology and Captain America's leadership to save both universes.
One possible plot could be that Superman is somehow transported to the Marvel universe. He might initially be seen as a threat by the Avengers. But then they realize he's there to help against a common enemy, like a powerful cosmic villain. They would team up, with Superman's super strength and flight abilities complementing the Avengers' various skills.
One possible plot could be that a powerful villain from another dimension threatens both the DC and Marvel universes. Superman and the Avengers have to put aside their differences and combine their powers. For example, Superman's super strength and flight could be paired with Thor's godly abilities and Captain America's leadership. They could start off not trusting each other, but as the battle progresses, they learn to work together and defeat the villain in an epic showdown.
If Superman met the Avengers in a fanfiction, there would likely be a clash of egos at first. Superman is used to being one of the most powerful beings on his Earth, and the Avengers have their own set of strong personalities like Iron Man and Thor. However, they would soon realize that they could achieve great things together. Maybe they would team up to fight a common enemy from another dimension that neither could handle alone. Superman's super strength and flight could combine well with the Avengers' diverse powers and teamwork skills.
In some fanfiction, Superman's powers might be a bit different when he crosses over with the Avengers. For example, his heat vision could interact in a new way with Iron Man's suit technology. The story could explore how the Avengers, with their unique skills, and Superman work together to stop a powerful villain like Loki who has managed to gain control over some Kryptonian tech. There could be a lot of interesting character interactions, like Captain America trying to understand Superman's sense of justice which is different from his own but still has similarities. Superman, on the other hand, might be intrigued by the Avengers' teamwork and how they function without having powers like his.
The plot could involve Superman arriving in the Avengers' world during a time when they are divided. His presence could be the catalyst that brings them back together. Superman's moral code and unwavering belief in doing good might inspire some of the more conflicted Avengers. They could then join forces to face a common enemy, like an alien race that is trying to invade Earth. Superman would bring his super - speed, heat vision and flight to the table, while the Avengers would contribute their own unique powers and technology. It would be an epic crossover full of action and heroic moments.
Another great pairing would be Superman and Captain America. Superman is an alien with god - like powers, while Captain America is a human with peak physical and moral strength. Cap could teach Superman about the value of human tenacity and leadership on a more down - to - earth level. And Superman could show Cap what true superhuman power looks like. They could work together to inspire the rest of the Avengers and any other heroes they encounter in a battle.
Definitely Superman and Thor. They both have super strength and are associated with powerful, other - worldly elements. Thor has his hammer and lightning powers, while Superman has his super - strength, heat vision, etc. It would be interesting to see them compete in a friendly strength - based challenge or fight side by side against a really strong foe.
One possible plot could be that the Voltron team gets transported to the Avengers' universe. They might initially be seen as threats, but then they realize they need to team up to fight a common enemy, like a powerful alien force that's too much for either group alone. The Voltron lions could combine in the middle of New York City, creating an amazing spectacle.
One possible plot could be that the Master Chief is somehow transported to the Avengers' universe. He teams up with Iron Man to stop a new threat that combines Covenant and Hydra technology. Their combined skills in combat and technology would make for an exciting adventure.
In this fanfiction, the mermaids from H2O could be discovered by the Avengers. Maybe the Avengers are on a mission near the beach where the mermaids live. The mermaids' unique abilities, like controlling water, could be mistaken for a new threat at first. But then they realize they can work together. The mermaids could use their water powers to help the Avengers during a big battle against a water - based villain like Namor. They form an unlikely alliance and learn from each other's worlds.