For nearly two decades, the single biggest running joke among comic book movie fans was the absolute, chaotic disregard for timeline consistency in 20th Century Fox’s X-Men franchise. Characters aged backwards, dead mutants walked again, and Days of Future Past essentially threw a temporal grenade into the entire structure.
However, as Marvel Studios prepares to dismantle the multiverse in Avengers: Doomsday, those old headaches are reportedly being reframed as a brilliant piece of macro-narrative cosmic law.

While fans have assumed that Incursions—the catastrophic collision and mutual destruction of two realities—are strictly caused by rogue sorcerers or multiversal travelers overstaying their welcome, Doomsday is reportedly introducing a much more volatile catalyst: temporal instability.
According to information from YouTuber Nerdtower, the Fox X-Men universe’s constant, reckless abuse of time-travel is the direct, structural cause of its impending collapse. Though Nerdtower may not be a familiar name, his information does line up with that of other, more familiar scoopers such as John Campea.
Much like how mainstream Marvel Comics utilizes decades of messy, retconned history as an embedded narrative feature of its continuity, Doomsday will retroactively establish that every single instance of mutants rewriting their past fractured the structural integrity of Earth-10005.
This explicitly explains why the iteration of the team we see in Doomsday functions as the definitive main Fox lineup despite glaring, timeline-defying discrepancies. Because the timeline has bent and snapped back so many times, it has settled into a baseline where Mystique remains alive and on the team, mutants are thriving well past the bleak expiration date seen in Logan, and the characters are finally sporting comic-accurate, vibrant costumes. The anomalies are proof of a decaying universe.
This temporal decay theory injects an incredibly logical answer into another massive Doomsday puzzle: Why are the Fantastic Four on a collision course with the X-Men?
Early production leaks via MyTimeToShineH previously claimed that Robert Downey Jr.’s Victor Von Doom, hailing from the retro-futuristic Earth-828, approaches Reed Richards and the First Family for assistance regarding Incursions. The group then utilizes their ship to jump universes to warn the MCU, before ultimately aligning to target the X-Men universe as the epicenter of the next catastrophic collapse.

By establishing that entirely different, localized anomalies—such as the X-Men’s constant time-travel tampering or the unique, cosmic reality-warping abilities of a child like Franklin Richards on Earth-828—can trigger structural collapses, Marvel is building a far more complex multiversal ecosystem.
Amid all the concerns about the Russo brothers making Avengers: Doomsday, leveraging the ridiculous nature of Fox’s failed efforts with the X-Men into a plot point is inarguably a minor stroke of genius. In doing so, Marvel honors the exact chaotic, rule-breaking spirit that defined the early 2000s comic book boom. It gives the upcoming tragedy of Doomsday a layer of cosmic poetic justice: the very temporal choices the X-Men made to save their own futures are the exact crimes that doomed their entire reality.

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