The post-credits scene is far lighter, and doesn't hint at future stories. Instead, it's an animated sequence shown on an old-timey television — more specifically, it appears to be the theme song of the "Fantastic Four" television show that exists in-universe.

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

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.