Multiple X-Men movies have been released so far, but Avengers: Doomsday will do something with the Mutants that we've rarely seen on the big screen before.

First Steps" in the article below. Galactus, a skyscraper-sized, planet-eating cosmic being, may be the primary antagonist of "The Fantastic Four: First Steps," but no villain looms larger in the Marvel blockbuster than Doctor Doom (Robert Downey Jr.

The Fantastic Four will join forces with other MCU characters in Avengers: Doomsday, but some of the best characters in First Steps will be left behind.