Marvel has finally explained exactly why it wanted Fantastic Four to release before the full introduction of the MCU's mutants with X-Men, and it connects to their entire Multiverse Saga plan. When Disney completed its takeover of Fox back in 2019, the rights to many Marvel characters came with it, the biggest of which were the Fantastic Four and the X-Men. Both were teased at San Diego Comic-Con in 2019, albeit briefly and without concrete details, but more progress has subsequently been made with the Fantastic Four movie, which had Jon Watts tapped to direct and was tentatively given a 2023 release.
Those plans have changed: Watts will no longer direct, and the MCU's Fantastic Four movie's release date is now in 2024 (November 8, 2024 to be precise). At the same time, the first mutant is officially in the MCU thanks to Ms. Marvel, which confirmed Kamala Khan is a mutant in this universe. However, there is noticably still no movement on mutants beyond that, with no announcements on them or the X-Men at San Diego Comic-Con 2022, despite a slew of announcements for Phases 4-6, including Fantastic Four and two new Avengers movies.
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That itself explains why Marvel wanted Fantastic Four before mutants and the X-Men, though. The Fantastic Four movie's release date makes it key to the Multiverse Saga, as it will be the beginning of Phase 6; that suggests it will be crucial to setting up the events of Avengers: The Kang Dynasty and Avengers: Secret Wars, and there's a clear link between all of those movies: Kang the Conqueror. The MCU's Fantastic Four movie can better explain Kang and the multiverse, because it has such a direct connection to him: Kang is Nathaniel Richards,
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