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.

First Steps. In a mid-credits scene he was seen allowing Sue and Richard's son Franklin Richards touching his face. But what is the larger impact of this scene leading up to Avengers Doomsday?

First Steps' includes two post-credits scenes. Here's how that big reveal sets up what's coming in Phase 6 of the MCU.