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' includes two post-credits scenes. Here's how that big reveal sets up what's coming in Phase 6 of the MCU.

So does RDJ’s Doctor Doom pop up in the new Fantastic Four movie? Well, sort of.