With the recent addition of Sony's Spider-Man in the Marvel Cinematic Universe, some people started to beg a question. If Marvel and Sony can share Spider-Man, why can't Fox and Marvel share their properties? Recent news says that Fox and Marvel may be working on a deal, but how would they introduce them in both universes organically? The answer -- Doctor Strange.
Doctor Stephen Strange is getting his own solo movie November 4, 2016, and it looks like nothing we've seen before -- from Marvel, at least. Many people are comparing it to Inception, Batman Begins, and the Matrix. Which isn't really a bad thing, as those are all great movies. We don't know much about the movie, but what we do know about is the comics. In the comics, Doctor Strange often travels to other dimensions and is an extremely powerful being. Now, what does this have to do with a X-Men-Avengers crossover?
Why wouldn't Doctor Strange be able to travel to a universe just like the X-Men's? Maybe the Avengers will need a lot of help when Infinity War comes! Maybe Doctor Strange accidentally transports the Avengers to the X-Men universe or vice versa. Besides, who doesn't want to see Colossus and the Hulk fight each other? This seems like the most organic way to do it. I mean, do you really think two superhero teams never saw each other on the news or anything for the past four years? Yeah, I doubt it. Hollywood has a tendency to give us exactly what we want, and this sounds like the way to do it.