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

First Steps" has a thrilling ending that teases Dr. Doom and where the MCU goes from here in "Avengers: Doomsday."

Spoiler alert! This article contains spoilers for The Fantastic Four: First Steps. The Fantastic Four: First Stepsopened with a scene on par with the beautiful ending of Avengers: Endgame, and that’s arguably why the movie worked.