Ever since the Disney-Fox merger that occurred in 2019, fans have been waiting to see their favorite Marvel characters from the Twentieth Century Fox films make their MCU debut, especially the X-Men. WhenThe Falcon and The Winter Soldiercame out with an episode that took place in Madripoor, the legendary mutant hub, it seemed that the studio was gearing up for an X-Men cameo, possibly from Wolverine. Of course, that didn’t end up happening, but a new fan theory suggests that another mutant may have been hiding in the show the entire time, and the points are rather convincing.

According to @mutantages on TikTok, the shapeshifting villain Mystique may have been hiding in plain sight throughoutThe Falcon and the Winter Soldier. He suggests that she wasdisguised as Sharon Carterall along, and there are a couple of possible clues that would support such a wild theory. For starters, Marvel had released a Madripoor-themed website ahead of the series debut and it featured several references to X-Men characters, including Mystique. When fans made note of them, Marvel quickly removed them from the website, which seemed suspicious.

Jennifer Lawrence as Mystique

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Then, inThe Falcon and the Winter Soldieritself, fans caught on to more subtlehints at Mystique’s presence, including a graffiti wall of skulls that could have been a nod to Mystique’s comic book outfit. The theory also points to a scene where Sharon Carter was bathed in blue light, a noticeably different fighting style for the series that was very reminiscent of Mystique’s, and a post-credits scene that showed her doing a “Mystique walk.”

Of course, these are highly speculative and nothing has been officially confirmed, but they would explainwhy Sharon Carter’s character seemed differentinThe Falcon and The Winter Soldiercompared toCaptain America: Civil War. Should Sharon Carter actually be Mystique, it would give Marvel Studios the perfect way to introduce a new X-Men storyline in the MCU, one that could involve other mutants from the Twentieth Century Fox properties.

Earlier this year,Evan Peters' Quicksilver, another X-Men character, made a cameo inWandaVisionand it also got fans buzzing. Ultimately, the dream is to see Marvel’s biggest on-screen teams come together in an epic adventure. While Kevin Feige has assured fans that Marvel is working on bringing the X-Men to the MCU, it’s still unclear when it will actually happen. For now, fans will just have to take his word and continue waiting patiently for their grand arrival.

The Falcon and The Winter Soldieris now streaming on Disney Plus.