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

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

Honestly, no joke, The Fantastic Four: First Steps had such a killer emotional scene that fans straight-up forgot Vanessa Kirby is also in Avengers: Doomsday. Yep, the same Kirby who’s supposed to be suiting up for Marvel’s next mega-event had us convinced Sue Storm was actually dying.