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

First Steps below. The plot of The Fantastic Four: First Steps revolves around Marvel’s First Family’s dire encounter with Galactus, the Devourer of Worlds (Ralph Ineson). Doomed to feel an everlasting hunger that can only be appeased by the total consumption of worlds brimming with life,

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.