What could be the plot of a Halo and Avengers crossover fanfiction?

The plot might center around a new super - weapon. In the Halo universe, there are powerful weapons like the Halo rings. Imagine if some evil force in the Marvel universe gets hold of this technology. The Avengers and Halo characters would have to work together to stop it. For example, Captain America's leadership skills and the Chief's military tactics would be crucial in formulating a plan to retrieve or destroy the weapon.

Well, in this crossover, perhaps the Covenant from Halo decides to take advantage of the chaos in the Starship Troopers' world. The bugs become a new target for the Covenant's religious zeal. Meanwhile, the Starship Troopers' soldiers and the Halo UNSC forces have to figure out how to deal with this new threat. They might start by sharing intelligence about the Covenant and the bugs. Some Starship Troopers could be trained by the Spartans in more advanced combat techniques. And in the end, they all team up to stop the Covenant's plans and also push back the bug hordes.

Well, perhaps in this fanfiction, there's a multiverse rift that pulls Nightwing into the Avengers' world. The Avengers initially mistake him for an enemy, but after some misunderstandings are cleared up, they realize his skills. Together, they face a new threat created by a combination of Hydra and some of Nightwing's rogues gallery who have also crossed over. Nightwing could teach the Avengers some stealth tactics while they show him how to handle more powerful cosmic threats.

One possible plot could be that the Shikon Jewel gets scattered across the Marvel universe. Inuyasha and his friends, like Kagome, have to team up with the Avengers to retrieve the pieces. Iron Man might be intrigued by Inuyasha's sword and try to study it, while Captain America could admire Inuyasha's fighting spirit. They'd face villains who also want the power of the Shikon Jewel, creating an epic adventure.

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.

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.

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.

It could involve different timelines of the Avengers coming together. Maybe the Avengers from the original team meet their counterparts from an alternate universe where things like Tony Stark never became Iron Man in a different way. They have to team up to fight a common enemy that threatens all the universes.

The plot might involve a villain who has the ability to control both technology and Pokemon. The Avengers are called in because their experience with high - tech threats is needed. They meet up with Pokemon like Charizard, who can fly them around and provide firepower. Meanwhile, Pokemon trainers teach the Avengers about the different types of Pokemon and how to use their strengths. For instance, Black Widow could be paired with an Eevee that evolves into Sylveon and uses its fairy - type moves to help in battles. Together, they work to stop the villain from taking over both the Pokemon world and potentially other dimensions.

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.