The cast announcement for cast for Avengers: Doomsday, though prevailing theories suggest there are more to come.

Whatever the case, it is great to see that Marvel Studios is getting the ball rolling on one of its biggest cinematic events in recent years. The Avengers: Doomsday lineup dominated online conversation for the entire day when it aired last week and will hopefully keep that momentum going in the following months as further cast are announced and questions such as whether Marvel spoiled Thunderbolts* are answered. For now, with speculation at an all-time high, I think the announcement itself has already answered a burning question that has been floating since February.

Marvel's Avengers: Doomsday Cast Includes Original X-Men Actors

Six Actors From Fox's Original Franchise Were Revealed

While The Marvels' post-credits scene, where he also references Charles, whom we can all safely assume is Charles Xavier. Patrick Stewart's appearance in the cast lineup then hinted that Avengers: Doomsday would spotlight cast from Fox's X-Men franchise, which subsequent reveals confirmed.

Returning X-Men Actor

Character

Last Seen

Kelsey Grammer

Hank McCoy/Beast

The Marvels (2023)

Patrick Stewart

Charles Xavier/Professor X

Doctor Strange in the Multiverse of Madness (2022)

Ian McKellen

Erik Lehnsherr/Magneto

X-Men: Days of Future Past (2014)

Alan Cumming

Kurt Wagner/Nightcrawler

X2 (2003)

Rebecca Romijn

Raven Darkhölme/Mystique

X-Men: The Last Stand (2006)

James Marsden

Scott Summers/Cyclops

X-Men: Days of Future Past (2014)

Channing Tatum

Remy LeBeau/Gambit

Deadpool & Wolverine (2024)

The arrival of such actors as Ian McKellen and Alan Cumming s one incredibly convincing theory: that the MCU's foremost stars will be ed by the X-Men cast from an alternate universe. This stands to reason, given that the only places that the likes of Patrick Stewart and Kelsey Grammer have appeared in the MCU thus far have been alternate, even parallel, universes. It also all but confirms that the multiverse, which has been conspicuously neglected in much of the Multiverse Saga's installments, will play a key role in Avengers: Doomsday and probably Avengers: Secret Wars.

Captain America: Brave New World's Post-Credits Scene Teased A Fight Against "Others"

He Refers To The Others As "Heroes"

The Leader with his new design in Captain America Brave New World

The focus on alternate universes was teased in the post-credits scene for Captain America: Brave New World. This scene saw Sam Wilson visiting Samuel Sterns on the Raft, ostensibly to gloat about winning their previous bet. He left, however, with knowledge of an impending threat, as Sterns said to Captain America:

"It's coming. I've seen it in the probabilities, seen it plain as day. All you heroes, protecting this world — do you think you're the only ones? Do you think this is the only world? We'll see what happens when you have to protect this place from the others."

Sterns' mention of other worlds needs little elaboration after alternate universes were established in such installments as Doctor Strange in the Multiverse of Madness and Loki. At the same time, outside of Doctor Strange's encounter with the concept of Incursions, this is the first time that the MCU's leading cast has been explicitly informed of a looming threat from another universe. Given that the arch-villain of the Multiverse Saga, Doctor Doom, was only announced less than a year ago, it stands to reason that Doom would be at the helm of such an invasion.

Now, I think it's obvious who the "others" to whom Sterns referred are.

This raises an interesting question, as Sterns specifically references other "Heroes," whereas Doom is traditionally an outright villain. Rumors swirling about the return of other legacy MCU actors like Chris Evans therefore lends credence to the theory that Robert Downey Jr and his The Avengers co-stars would be portraying dark reflections of their Earth-616 counterparts - namely, the Dark Avengers. This would help to explain Robert Downey Jr.'s casting after portraying the character most synonymous with the MCU.

Another theory suggests that the Thunderbolts - who will also seemingly appear in Avengers: Doomsday - will take on the Dark Avengers mantle.

An alternative theory, of course, is that Sterns is referring to another group of more cut-and-dry heroes. With Doctor Doom traditionally being a lone wolf and Chris Evans continuing to flout reports of his return to the MCU, this one feels even more convincing. Nevertheless, the specific identity of this group of heroes remained a mystery until Marvel's surprise announcement. Now, I think it's obvious who the "others" to whom Sterns referred are.

The Leader Was Warning Captain America About Fox's X-Men

The Avengers: Doomsday Live Stream Reveals Exactly Which Superhero Team The Avengers Will Face

The Avengers: Doomsday start of production announcement stopped short of revealing which characters each actor would be playing. Nevertheless, with the unmistakable sound of the theme tune from X-Men: The Animated Series accompanying Patrick Stewart's reveal, it is now undeniably the case that the characters from Fox's X-Men franchise will star alongside the MCU's main cast in Avengers: Doomsday. This feels somewhat necessary to establish given how Robert Downey Jr. himself is an example of how the multiverse stipulates the same actor can portray different characters.

Related
30 Biggest Marvel Actors Missing From The Avengers: Doomsday Cast

At least thirty MCU characters were notably absent from Marvel Studios' official Avengers: Doomsday cast announcement, raising a lot of questions.

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This, combined with the Leader's foreboding words, suggests that Avengers: Doomsday will pit the Avengers against the X-Men in an adaptation of the same event that pervades Marvel Comics. I'm hopeful that there will be more X-Men en route for the official Avengers: Doomsday cast, as notable absentees include Storm and Jean Grey, whose involvement will be anticipated and provide some compelling stories and fights for the Multiverse Saga's climactic movie to adapt.

What The Leader's Warning Means For Avengers: Doomsday

It Looks Like Avengers: Doomsday Will Be Avengers Vs. X-Men

While the Leader's comments certainly suggest that the X-Men and Avengers will be locking horns in Avengers: Doomsday, this raises a particularly pertinent question about the surrounding circumstances. Both groups are composed of superheroes, and it would take an exceptional reason for these two virtuous teams to turn their sights on one another. There is a comic book precedent for such a showdown, but these typically comprise a Civil War style of conflicting interests.

Related
Avengers: Doomsday - Release Date, Cast, & Story Details

Avengers: Doomsday promises to bring an unprecedented kind of story to the forefront of the MCU, complete with one very important villain.

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With that in mind, it seems likely that the two groups will clash as an incursion threatens both of their universes. Given an incursion can threaten the fate of both universes, this should amount to a fight for survival, bringing some heartbreaking stakes as two beloved groups of superheroes go toe-to-toe. Furthermore, the collective age of the X-Men cast gives us a pretty big hint that this cohort will not make it out unscathed, particularly with Earth-616 housing so many characters still in the infancy of their respective franchises.

Then again, it's worth thinking about how Doctor Doom fits into all of this. With a name like Avengers: Doomsday, it seems likely that the Avengers and X-Men will ultimately rally together against Doctor Doom and whatever designs he has planned for the movie. Still, the Leader's warning did not mention Doctor Doom, so I would imagine that a fight will break out between the two groups of heroes before they up, and I don't think I'm ready for the emotional impact.

  • Avengeres Doomsday logo placeholder poster
    Avengers: Doomsday
    Release Date
    December 18, 2026
    Director
    Joe Russo
    Writers
    Stephen McFeely, Stan Lee
    • Chris Hemsworth Profile Picture
    • Headshot Of Vanessa Kirby
      Vanessa Kirby
      Sue Storm / Invisible Woman
    • Headshot Of Joseph Quinn In The Premiere Of A Quiet Place: Day One
      Johnny Storm / Human Torch
    • Headshot of Ebon Moss-Bachrach
      Ebon Moss-Bachrach
      Ben Grimm / The Thing

    Avengers: Doomsday is the fifth Avengers film in the Marvel Cinematic Universe and will bring together heroes, new and old, to face off against Victor von Doom - played by the returning Robert Downey Jr.. Avengers 5 will also mark the beginning of phase 6 of the MCU.

  • Captain America- Brave New World - Poster

    Your Rating

    Captain America: Brave New World
    Release Date
    February 14, 2025
    Runtime
    118 minutes
    Director
    Julius Onah

    WHERE TO WATCH

    Captain America: Brave New World (formerly titled New World Order) marks Sam Wilson's first MCU big-screen appearance as Steve Rogers' successor after receiving the suit and shield in Phase 4's The Falcon and the Winter Soldier. Anthony Mackie returns as the titular Avenger alongside Danny Ramirez as Joaquin Torres, Carl Lumby as Isaiah Bradley, and Tim Blake Nelson as The Incredible Hulk's former ally Samuel Sterns. Harrison Ford makes his MCU debut replacing the late William Hurt as Thaddeus Ross.

    After meeting President Thaddeus Ross, Sam is caught in a global crisis. He must expose the mastermind behind a sinister plot before the world descends into turmoil. Captain America: Brave New World marks the big-screen debut of Sam Wilson as Captain America, and Harrison Ford makes his MCU debut, replacing the late William Hurt as Thaddeus Ross.

MCU Movies