Here's who that mysterious figure was in the credits scene of "The Fantastic Four: First Steps" and how it sets up Doomsday.

Dedicated Marvel fans will spot a Doctor Doom Easter egg in The Fantastic Four: First Steps during a scene at the United Nations.

First Steps is finally in theaters, bringing the First Family to the Marvel Cinematic Universe. Now, all roads lead to Avengers: Doomsday, the next big crossover event in Marvel’s uneven but never-ending comic book movie saga.