...Or the Fantastic Four or the New Mutants... At various points, members of the FF and the two X-teams have joined the Avengers. Not very surprising since, in the comics at least, they all share the same universe. Why they won't be in the Avengers movies: When it comes to Avengers like the Invisible Woman, Mister Fantastic, the Thing, Wolverine, Storm, Havok, Cannonball, Sunspot, Rogue, or even Amadeus Cho, the problem is the same. Marvel Studios can't use these characters, as much as they'd like to. Here's hoping that situation changes and the two companies can come together to make the most fan-pleasing film of all - X-Men versus the Avengers! Now there's a movie that would a billion dollars all by itself.