How Franklin Richards, the power cosmic and Doctor Doom's appearance in "The Fantastic Four: First Steps" credit scene affects "Avengers: Doomsday."

Also, Doom wants to revive the most powerful Scarlet Witch of all. You might have guessed by now: It's Wanda (Elizabeth Olsen). "Doctor Strange in the Multiverse of Madness" implies that Wanda dies, though we never see her body. That's where Franklin comes in, as Doom wants his abilities to revive Wanda.

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