The Fantastic Four are coming home, but there's a theory that Marvel's most famous family already exists in the MCU. More than a decade after Iron Man paved the way for the Marvel Cinematic Universe's Phase 4; the MCU can finally count on the majority of Marvel characters via the Multiverse's myriad possibilities. In addition to the 2015 agreement hashed out with Sony for Spider-Man, Disney's purchase of Fox in 2019 gave Marvel Studios access to the Fantastic Four and the X-Men properties.
In late 2020, a Fantastic Four reboot in MCU was announced with Spider-Man: Homecoming trilogy director Jon Watts helming the production. The film, however, does not yet have a date or cast announced, although this has done little to dampen rampant casting speculation online. What is certain, however, is that the long-awaited MCU's Fantastic Four will be the fourth film and the third iteration of the group since 2005, with MCU's F4 version looking to improve upon the failed 2015 reboot Fantastic Four.
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The arrival of the Fantastic Four in the MCU also poses new challenges regarding how they will be integrated into Phase 4 or 5's story. For the last 14 years, the MCU has adapted some of the most important sagas from the comics without utilizing the Fantastic Four and the X-Men, with the popularity of these two groups of heroes in the comics being affected by their absence in the MCU. However, one theory posits that the Fantastic Four may already exist in the MCU – at least retroactively. According to this theory, the Fantastic Four are trapped in the Negative Zone, a parallel universe that the Fantastic 4's leader Reed Richards is always studying. If
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