There could be a plotline where an ancient artifact is discovered that has the potential to either destroy or save both the world of Ben 10 and Generator Rex. Ben and Rex are drawn to it for different reasons. Ben thinks it could be a powerful weapon against his enemies, while Rex believes it could help him understand more about the origin of nanites. However, they soon find out that there are many forces trying to get their hands on this artifact too. They must protect it from falling into the wrong hands and also decide what to do with it in the end. This would involve a lot of action, adventure, and moral dilemmas for both characters.
One idea could be a crossover where Generator Rex's nanites interact with the X - Men's mutant powers in unexpected ways. Maybe the nanites start to adapt and mimic some of the mutant abilities, causing chaos and confusion among both groups.
One idea could be that Naruto and Rex meet in a dimension where their worlds collide. Naruto's chakra powers and Rex's nanite abilities could create some really interesting battle scenes as they team up against a common enemy, like an evil organization that wants to control both their worlds.
One interesting crossover could be their powers combining in a unique way. For example, Ben could use one of his alien forms' abilities in tandem with Rex's nanites. Maybe Heatblast's heat powers could supercharge Rex's nanite - based weapons. Another aspect could be their personalities clashing and then learning from each other. Ben, being more of a carefree hero at times, could teach Rex to loosen up a bit, while Rex's more serious and scientific approach could help Ben be more strategic in his battles.
Start by establishing the basic premise. Decide if it's a full - on crossover or more of a one - off encounter. For instance, if it's a crossover, you need to think about how the two universes will merge. Are there any specific events that bring Rex and the X - Men together?
Another plot could be that an interdimensional rift opens up, and it's causing chaos in both Ben's and Rex's worlds. They discover that the source of the rift is related to the technology of both the Omnitrix and the Nanites. Together, they journey through the rift to find the cause and close it. Along the way, they meet alternate versions of themselves and their friends, which adds an interesting twist to the story.
It could be Ben when he transforms into Alien X. Alien X has near - omnipotent powers. He can manipulate reality on a cosmic scale. In a crossover, he could potentially use those powers to control the Nanites or even restructure Rex's powers in some way. However, he's also very difficult to control, so it's a double - edged sword.
I think an evil scientist who has found a way to combine the power of the Omnitrix and the nanites in a wrong way could be really interesting. He could be creating hybrid monsters that are very difficult for Ben and Rex to defeat. He would be constantly one step ahead because he understands both technologies so well.
One idea could be that Ben and Rex have to team up to stop a new villain who has the ability to disrupt both Omnitrix - based powers and Rex's nanites. They start off not trusting each other but as they face challenges, they learn to work together.
A 'ben x rex fanfic' is likely a fan - made fictional story that involves the characters Ben and Rex. It could be about their adventures together, or perhaps a unique take on their relationship, like them teaming up to face a new and powerful enemy. It might also explore their individual powers and how they complement each other in the context of the story.