Here’s what happens in the mid-credits scene and post-credits scene of The Fantastic Four: First Steps, and how the entire movie sneakily and subtly sets up a multiverse crossover for Avengers: Doomsday next year. First Steps Mid-Credits Scene, ExplainedRobert Downey Jr., dressed as Doctor Doom, on stage at Comic-Con in 2024. Matt Winkelmeyer/Getty Images Entertainment/Getty ImagesAfter the ending of the movie, and some colorful credits featuring the main cast, we get a very brief mid-credits scene. But this sweet scene is interrupted by the appearance of a figure wearing a green cape, and holding the distinctive mask of Doctor Doom. In addition to the somewhat serious mid-credits scene, The Fantastic Four: First Steps also has a jokey post-credits scene.