Robert Downey Jr.'s Doctor Doom is after Franklin Richards for a major reason, and the new Fantastic Four member should be key to Avengers: Doomsday.

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?

Robert Downey Jr's Doctor Doom's motivation for potentially going after Marvel's first family might boil down to Franklin Richards' powers.