A new Avengers: Doomsday theory explores how the Fantastic Four might travel to Earth-616. It suggests Reed Richards uses Galactus’ ancient ship tech, combined with his own inventions, to build multiversal transport and rescue Franklin Richards from Doctor Doom’s grasp.

Marvel Studios head Kevin Feige recently teased a meeting between the Avengers, X-Men, and Fantastic Four at the Baxter Building in Avengers: Doomsday. Following the release of The Fantastic Four: First Steps,

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.