Here's who that mysterious figure was in the credits scene of "The Fantastic Four: First Steps" and how it sets up Doomsday.

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