Marvel’s ‘Fantastic Four’ introduces powerful new characters to the MCU, and ends with tease for ‘Avengers: Doomsday’—here’s the ending and post-credits scene, explained.

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.