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.

Avengers: Doomsday marks the climax of Phase Six of the Marvel Cinematic Universe (MCU), and is slated to be Marvel’s boldest crossover yet. Expect returning heroes, cosmic power struggles, and an ominous shape‑shifting villain.

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.