Avengers Doomsday: Full Cast Revealed, OG X-Men Return to Battle Robert Downey Jr’s Doctor Doom

Chris Hemsworth’s Thor, original X-Men stars, and Marvel’s newest heroes unite in the epic 2026 Avengers film—Robert Downey Jr returns, but as the villain.

March 27, 2025: Marvel Studios has officially revealed the full cast for Avengers: Doomsday, the highly anticipated fifth installment in the Avengers saga, set to hit theatres in May 2026. The announcement was made in an unconventional and creative way—via an Instagram Live stream showing production chairs revealing names across several hours.

This marks the first Avengers film since the record-breaking Avengers: Endgame (2019), and the studio is pulling out all the stops, blending the old guard with new faces in what could be Marvel’s most ambitious crossover yet.

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The Original Avengers and X-Men Return

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The core cast includes returning favorites:

• Chris Hemsworth (Thor)
• Anthony Mackie (Captain America)
• Sebastian Stan (Bucky Barnes)
• Paul Rudd (Ant-Man)
• Tom Hiddleston (Loki)

They will be joined by the original X-Men from the early 2000s Fox franchise:

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• Patrick Stewart (Professor X)
• Ian McKellen (Magneto)
• Kelsey Grammer (Beast)
• Rebecca Romijn (Mystique)
• James Marsden (Cyclops)
• Alan Cumming (Nightcrawler)

With Disney’s acquisition of Fox, this crossover cements the X-Men’s official integration into the MCU.

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New Avengers Rise: Fantastic Four and More

In a move to set up the MCU’s future, several newcomers also feature:

• Vanessa Kirby (Sue Storm / Invisible Woman)
• Pedro Pascal (Reed Richards / Mr. Fantastic)
• Ebon Moss-Bachrach (Ben Grimm / The Thing)
• Joseph Quinn (Johnny Storm / Human Torch)

They will appear first in Fantastic Four: First Steps before uniting with the Avengers.

Also confirmed are:

• Simu Liu (Shang-Chi)
• Tenoch Huerta (Namor)
• Letitia Wright (Shuri)
• Winston Duke (M’Baku)
• Florence Pugh (Yelena Belova)
• David Harbour, Wyatt Russell, Hannah John-Kamen, and Lewis Pullman from Thunderbolts
• Danny Ramirez (Falcon)

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Big Absentees—and Surprising Villain

Curiously, Tom Holland’s Spider-Man and Hugh Jackman’s Wolverine were absent from the revealed lineup, likely due to rights issues with Sony and pending announcements.

However, the biggest twist is the confirmed return of Robert Downey Jr., not as Iron Man—but as Doctor Doom, the iconic Marvel villain. Downey Jr. teased the role last summer, signaling a major shift for the franchise.

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Avengers: Doomsday is shaping up to be a cinematic event, blending nostalgia, fresh energy, and shocking turns. With a star-studded ensemble, this 2026 release could redefine the MCU’s future—just as Endgame redefined its past.

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Avengers Doomsday, Marvel 2026, Robert Downey Jr Doctor Doom, OG X-Men, MCU Phase 6, Chris Hemsworth Thor, Vanessa Kirby Sue Storm, Patrick Stewart Professor X, Ian McKellen Magneto, Fantastic Four MCU, Avengers 5 Cast, Marvel Movie News, Disney Marvel