Marvel Studios head Kevin Feige recently teased a meeting between the Avengers, X-Men, and Fantastic Four at the Baxter Building in Avengers: Doomsday. Following the release of The Fantastic Four: First Steps,

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.

Doomsday theory explores how the Fantastic Four might travel to Earth-616. It suggests Reed Richards uses Galactus’ ancient ship tech, combined with his own inventions, to build multiversal transport and rescue Franklin Richards from Doctor Doom’s grasp.