A good chunk of Doomsday could focus on a clash between Avengers and X-Men with RDJ’s Doom cackling in the background, with a kidnapped Franklin by his side. The premise certainly gives the Fantastic Four a reason to breach their multiversal walls and zip over to 616 to meet the New Avengers.

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