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.

Here are all the movies and shows Marvel has left to release before its next major team-up film, "Avengers: Doomsday"

First Steps cleverly paid homage to the true cinematic first steps of Marvel's first family. Here's what to look for to find them.