Rumors. Spoilers. Fan theories. And maybe… a little truth? Just days after Marvel Studios confirmed that Avengers: Doomsday is officially in production—with a jaw-dropping cast reveal that includes Chris Hemsworth, Anthony Mackie, Simu Liu, Florence Pugh, and several returning X-Men favorites—new plot details have surfaced online. And if they’re even partially true, buckle up. This could be the most ambitious MCU chapter yet.
Shared first by The Cosmic Circus’ Alex Perez on Discord and later picked up by the r/MarvelStudiosSpoilers subreddit and reported by Comic Book Movie, the rumored plot offers an epic premise: the final “Incursion” between Earth-616 and a divergent X-Men universe (reportedly modeled after Days of Future Past continuity). Think multiversal collision—but with emotional stakes and full-on interdimensional paranoia.
Avengers vs. X-Men?
According to the leak, both worlds believe they’re under attack—and the only way to survive is to eliminate the other. This sets the stage for a long-speculated brawl between Marvel’s two most iconic teams. It’s a setup that also retroactively connects to the post-credits scene in Captain America: Brave New World, where The Leader warned Sam Wilson about interdimensional threats.
Expect major matchups, including Hulk vs. Wolverine (finally), and a Brotherhood of Evil Mutants/X-Men alliance that throws traditional loyalties into chaos.
Meanwhile, on Earth-616…
While chaos erupts between worlds, Monica Rambeau—last seen stranded in an alternate dimension during The Marvels—becomes the tether between the two universes. Captain Marvel, Wong, Shang-Chi, and the Hulk are said to team up to bring her home, while Ms. Marvel begins assembling a young team of her own.
And yes, Spider-Man reportedly gets pulled into the conflict too. Although reluctant to join at first, he eventually suits up in a symbiote-style black-and-white version of the No Way Home suit.
Enter Doctor Doom
One of the most buzzed-about rumors is Robert Downey Jr.’s surprise return—not as Tony Stark, but as Victor Von Doom. According to the leak, Doom despises Kang and the TVA and blames them for the multiversal unraveling. He stages an assault on the TVA during the film’s third act, with Doctor Strange and Clea in pursuit and Loki positioned as a pivotal McGuffin.
This clash reportedly ignites a full-scale multiversal war inside the TVA, which will ripple into Secret Wars, set to follow in 2027.
Real Leak or Fan Dream?
As with all “leaks,” take this with a grain (or fistful) of salt. But much of the info aligns with existing casting news and post-credit teases. And let’s be honest—Avengers vs. X-Men and a multiversal Doctor Doom played by RDJ? It might just be wild enough to be true.
One thing’s for sure: Avengers: Doomsday is shaping up to be the biggest Marvel event since Endgame. The Russo Brothers are back at the helm and already teasing a return to focused storytelling.
“Some people wrote off the genre as just for children,” Anthony Russo recently told press. “But we think of it as relevant for adults—if treated with maturity and complexity. We want to bring that focus back.”
Avengers: Doomsday hits theaters in May 2026, with Secret Wars arriving one year later. Let the countdown begin.
The Geek is a working screenwriter, director and screenwriting instructor.
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