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?

But that all changes in the movie's post-credits scene, when the vibe shifts and suddenly there's a metal-masked stranger hanging out in the living room of the Baxter Building. If you've seen The Fantastic Four: First Steps and need some Reed Richards–level tutoring to figure out just what the heck is going on,