Doctor Strange in the Multiverse of Madness could introduce a major X-Men location in the MCU. The multiverse is central to the MCU's Phase 4, with Spider-Man: No Way Home demonstrating its true potential when it teamed up Tom Holland's Spider-Man with Tobey Maguire's and Andrew Garfield's. Doctor Strange in the Multiverse of Madness promises to continue the trend, with the second trailer featuring Patrick Stewart's Charles Xavier. That particular film promises to transform the entire MCU in a multiversal catastrophe that tests Doctor Strange and the Masters of the Mystic Arts to their limits.
Marvel Studios president Kevin Feige has long hinted he expects Doctor Strange 2 to redefine the MCU, setting up major supernatural elements for the MCU's future — and potentially more besides. What's more, recent movies have suggested there could be changes on an unprecedented scale; Eternals literally featured a creature emerging from the center of the Earth, and ended with the corpse of a massive Celestial frozen in place in the ocean. Like the comics, the MCU has always been set in "the world outside your window" — but in the aftermath of Avengers: Endgame, Marvel Studios clearly don't mind differentiating it from the real world anymore.
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This is particularly important because Doctor Strange 2 could draw ideas from the resolution of the comic books' Secret Warsevent. This was a multiversal catastrophe at an unprecedented scale, and in the end the super-powerful Franklin Richards used his powers to restore reality. It didn't quite go right, though, because fragments of other dimensions such as Weirdworld were left stranded on Earth. Should Marvel take a
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