Robert Downey Jr.’s Doctor Doom to Lead Avengers and Fantastic Four Against X-Men in Avengers: Doomsday

(Note: This article contains spoilers for Marvel’s Avengers: Doomsday.)

Avengers: Doomsday—featuring the Avengers, Wakandans, Fantastic Four, the New Avengers (Thunderbolts), and the original X-Men—is now in production in London.

According to a report from the QuidVacuo website, Robert Downey Jr. might play an alternate version of Doctor Doom in Avengers: Doomsday. In this version, Doctor Doom secretly causes a conflict between the Avengers and the X-Men. He uses the Avengers to go against the Mutants in order to weaken both teams. His real plan is to reach a powerful energy source that could help him restore his own destroyed universe. This gives his character a more emotional and personal motivation behind his actions.

We already reported that Avengers: Doomsday will reportedly feature Victor Von Doom taking advantage of his resemblance to Tony Stark to present himself as an ally to the MCU.

In a recent interview with BuzzFeed UK, Alan Cumming, who returns as the X-Men’s Nightcrawler in Avengers: Doomsday, revealed that his character will be fighting Pedro Pascal‘s Reed Richards in the movie.

Cumming said, “I’m sort of learning these fights, and I’m like, ‘What? Who am I fighting with?’ [They’re like,] ‘You’re hitting Pedro Pascal on the head.’”

Here’s the plot details for Avengers: Doomsday:

Avengers: Doomsday will mark the beginning of the end of the Marvel Cinematic Universe (MCU). As the multiverse nears total collapse, the Avengers assemble to face their biggest challenge yet—incursions, catastrophic collisions between realities that could destroy the entire multiverse. Earth’s Mightiest Heroes must race against time to save their reality while confronting the powerful figure behind it all—Victor Von Doom (Downey Jr.).

in the film, Downey Jr.’s Doctor Doom isn’t truly evil; he believes he is trying to save the Multiverse from incursions. In his twisted logic, the only way for the Multiverse to survive is to unify all universes in one place (Battleworld) under his rule. He sees this as the sole path to ensuring survival for everyone.

Directed by Russo brothers from a screenplay by their longtime collaborator, Stephen McFeely. Newton Thomas Sigel (Bohemian Rhapsody, X-Men: Days of Future Past) will be the cinematographer.

The official cast members of the film include Downey Jr. as Doctor Doom, Paul Rudd as Ant-Man, Simu Liu as Shang-Chi, Tom Hiddleston as Loki, Florence Pugh as Yelena Belova, Danny Ramirez as Falcon, Sebastian Stan as Bucky Barnes, Winston Duke as M’Baku, Chris Hemsworth as Thor, Letitia Wright as Black Panther, Tenoch Huerta Mejía as Namor, Anthony Mackie as Captain America, David Harbour as Red Guardian, Wyatt Russell as U.S. Agent, and Hannah John-Kamen as Ghost. Ian McKellen as Magneto, Patrick Stewart as Professor X, Rebecca Romijn as Mystique, James Marsden as Cyclops, Kelsey Grammer as Beast, Alan Cumming as Nightcrawler, and Channing Tatum as Gambit. Pedro Pascal as Reed Richards (Mr. Fantastic), Vanessa Kirby as Sue Storm (Invisible Woman), Joseph Quinn as Johnny Storm (Human Torch), Ebon Moss-Bachrach as Ben Grimm (The Thing), and Lewis Pullman as Sentry.

Recently, on The Hot Mic podcast, Jeff Sneider revealed an unannounced cast list for Avengers: Doomsday, which reportedly includes Mark Ruffalo (Bruce Banner/Hulk), Benedict Wong, Brie Larson, Hayley Atwell, Don Cheadle, Karen Gillan, Jeremy Renner, Iman Vellani, Danai Gurira, Tessa Thompson, Ke Huy Quan, Teyonah Parris, Will Poulter, Dominique Thorne, Xochitl Gomez, Sophia Di Martino, Tatiana Maslany, Yahya Abdul-Mateen II (Wonder Man), Kathryn Newton, Wunmi Mosaku, Lashana Lynch, Famke Janssen, Halle Berry, Kai Zen Aspilla, Owen Wilson, Chris Pratt, Samuel L. Jackson, Charlize Theron, Benedict Cumberbatch, Chris Evans, Bradley Cooper, Vin Diesel, and Maria Bakalova.

Produced by Kevin Feige, Louis D’Esposito, and Russo Brothers will produce through their AGBO banner.

Avengers: Doomsday hits theaters on May 1, 2026.

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