Avengers: Doomsday — Every Confirmed Character, the Full Cast, and the Comic Story It's Building Toward

For years the Marvel Cinematic Universe has been promising a collision. Avengers: Doomsday is where it finally happens — and where the man who built the whole thing walks back on screen wearing a different mask. Robert Downey Jr. returns on 18 December 2026, not as Iron Man but as the armoured tyrant Doctor Doom, pulling heroes out of three different universes and into one film.

Below is the honest map of it: the villain, the full confirmed cast read the way Marvel frames it — as three worlds crashing together — the names that are still only rumour, and the comic story the film is clearly building toward. The film is unreleased; the cast is real and confirmed, but the plot is not — that part is read off the comics and labelled as such. Everything was checked on 11 July 2026.

Doctor Doom — and why he has Tony Stark’s face

The saga was supposed to belong to Kang the Conqueror. After actor Jonathan Majors was convicted and dropped by Marvel in December 2023, the studio tore that plan up and reached for its most valuable player. At San Diego Comic-Con in July 2024, a figure in a green cloak and metal mask walked out on stage, pulled the mask off, and it was Robert Downey Jr.

Marvel chief Kevin Feige explained the logic in a single line: “He played the most iconic hero. Let’s have him play the most iconic villain.” Co-director Joe Russo called the idea “explosive.” What the film has not explained is how Tony Stark’s face ends up on Victor von Doom — and that mystery is doing a lot of the marketing’s work. (The comics, as we’ll see, have quietly done a version of this before.)

Downey isn’t playing a returning Iron Man. He’s playing a new character, the villain the next two Avengers films revolve around.

Three universes, one collision: the confirmed cast

Marvel’s official logline says the heroes are drawn “from three distinct universes” onto “a deadly collision course.” That’s also the cleanest way to make sense of a cast this size. The core ensemble was revealed in a marathon 26 March 2025 livestream (announcing actors one director’s chair at a time), with more added at CinemaCon in April 2026. Everyone below is confirmed; the exact headline count is disputed (it’s around two dozen and change), so we’ve skipped the number and kept the people.

Beside each name we’ve added the actor’s verified Instagram (only where we could confirm the real account — a cast this big attracts impostor pages) and a fuller note on the role they could play. One important flag: the cast is confirmed, but those role notes are not. Marvel hasn’t said what any character actually does in Doomsday — so read the notes below as informed guesses, drawn from each character’s comics history and Marvel’s setup, not as a leak.

The threat that connects them

• Doctor Doom — Robert Downey Jr. · @robertdowneyjr — The villain, and the reason all these universes collide in the first place. In Jonathan Hickman’s Secret Wars, Doom seizes the leftover power of a dying multiverse and remakes reality as Battleworld, ruling it as a god — so the safe bet is that this Doom is the story’s engine, quite possibly presented as a would-be saviour of a collapsing multiverse before his real design shows. Exactly how the film puts Tony Stark’s face on him is one of its biggest teases.

Universe one — the MCU’s own heroes

The largest contingent: the surviving Avengers, the new “New Avengers” from Thunderbolts*, Wakanda and Talokan, Loki, and Sam Wilson’s Captain America corner.

• Thor — Chris Hemsworth · @chrishemsworth — One of the few heroes with the raw power to trade blows with a god-tier Doom, so expect him on the front line. After everything the saga has already taken from him, he’s also a candidate for a major sacrifice — though that’s guesswork.
• Steve Rogers — Chris Evans · @chrisevans — The most guarded return of the lot; he was teased at CinemaCon holding Mjolnir. Whether this is the original Steve, an older version, or a variant from another universe is unconfirmed, and how the film handles his Endgame farewell is one of its best-kept secrets.
• Sam Wilson / Captain America — Anthony Mackie · @anthonymackie — The MCU’s current Cap, and the natural figure to rally the present-day heroes as the incursions begin. Look for him anchoring the “now” Avengers alongside the returning legends and the newcomers.
• Joaquín Torres / Falcon — Danny Ramirez · @dannyramirez — Sam’s partner and the new Falcon, most likely a supporting player in Sam’s orbit rather than a headline arc.
• Bucky Barnes — Sebastian Stan · @imsebastianstan — A New Avenger and, in the current MCU, a sitting congressman — a bridge who can move between the government, the Thunderbolts and the old guard.
• Yelena Belova — Florence Pugh · @florencepugh — A breakout leader of the New Avengers, and one of the newer heroes most likely to get a real emotional throughline here, given how central Pugh has become to Marvel’s next generation.
• Red Guardian — David Harbour · @dkharbour — Blunt-force muscle and comic relief for the New Avengers; expect him to carry some of the levity in a very heavy film.
• U.S. Agent — Wyatt Russell · (no public account) — The team’s volatile wildcard — exactly the sort of character a crisis this big can push in either direction.
• Ghost — Hannah John-Kamen · @hannahjohnkamen — Her ability to phase through matter could be more than a gimmick against threats that warp reality and punch through worlds, though her specific part is unknown.
• Sentry — Lewis Pullman · (no public account) — Potentially the most important wildcard on the board: a being with near-limitless power and a self-destructive dark half, the “Void.” A hero that strong could end the threat outright — or become one.
• Loki — Tom Hiddleston · @twhiddleston — Arguably the single most plot-critical returning character. His series left him seated at the heart of the multiverse, personally holding the branching timelines together — which makes him either the linchpin of any fix, or the first casualty when an incursion war truly breaks loose.
• Ant-Man — Paul Rudd · (no public account) — His Quantum-Realm expertise is the exact kind of science these stories lean on for a last-second save, so expect utility (and jokes) more than the spotlight.
• Shang-Chi — Simu Liu · @simuliu — The mystical, possibly cosmic Ten Rings give him a ceiling the MCU still hasn’t shown — a strong candidate to finally reveal what he can really do.
• Cassie Lang — Kathryn Newton · @kathrynnewton — A next-gen Young Avenger; her presence is part of Marvel quietly seeding the heroes meant to outlast this saga.
• Shuri / Black Panther — Letitia Wright · @letitiawright — Wakanda’s leader and one of the sharpest scientific minds in the MCU, an obvious asset for any techno-scientific fix. Some fans even theorise Wakanda could be a “ground zero” for an incursion — pure speculation, but a sign of how central she might be.
• M’Baku — Winston Duke · @winstoncduke — Wakandan strength and stubborn heart, most likely fighting at Shuri’s side.
• Namor — Tenoch Huerta Mejía · @tenochhuerta — Talokan’s proud, morally-grey king is the classic wildcard: a force powerful enough to matter, answerable to no one, and as likely to hinder the heroes as help them.
• Namora — Mabel Cadena · @mabel__cadena — One of Talokan’s fiercest warriors, expected to fight at Namor’s side.
• Attuma — Alex Livinalli · @alivinalli — Talokan muscle, in the field on Namor’s command.

Marvel’s roster also lists two child-actor deep cuts from this universe — India Rose Hemsworth as Love (from Thor: Love and Thunder) and Wesley Holloway in a role Marvel hasn’t disclosed. Both are minors, so we don’t list social handles for them.

Universe two — the Fantastic Four

Fresh off The Fantastic Four: First Steps (2025), which is set in its own retro-future universe.

• Reed Richards / Mister Fantastic — Pedro Pascal · @pascalispunk — Doom’s lifelong rival and, in the comics, the emotional core of Secret Wars: Doom blames Reed for the accident that scarred him and envies his intellect. If the film keeps any of that, the Doom-versus-Reed duel of minds is likely its true spine — not the spectacle.
• Sue Storm / Invisible Woman — Vanessa Kirby · @vanessa__kirby — In the comics, God-Emperor Doom takes Sue as his queen on Battleworld — a comic beat, not a confirmed film plot, but it’s exactly why putting Sue, Reed and Doom in one movie is so loaded. Her own power set (force fields, invisibility) also makes her one of the Four’s heaviest hitters.
• Ben Grimm / The Thing — Ebon Moss-Bachrach · @ebonmossbachrach — The FF’s blunt instrument, newly arrived from his own universe; expect him on the front line of the fighting.
• Johnny Storm / Human Torch — Joseph Quinn · @josephquinn — The FF’s hot-headed flyer and most impulsive member — good for both spectacle and for friction within the team.

Universe three — the Fox X-Men

This is the row that stopped fans mid-scroll: the actors from 20th Century Fox’s two-decade run of X-Men films are officially back. (They come from X2 in 2003, The Last Stand in 2006, and — for Gambit — Deadpool & Wolverine in 2024.)

• Professor X — Patrick Stewart · @sirpatstew — The moral centre of an entire universe of mutants dragged into the war. His telepathy is a strategic asset, and his decades-old ideological clash with Magneto is precisely the kind of history the film can mine for weight.
• Magneto — Ian McKellen · @ianmckellen — A power on the level of the story’s biggest threats, and a perennial wildcard: hero, antagonist or reluctant ally depending on what’s at stake for mutantkind.
• Cyclops — James Marsden · @james_marsden — The X-Men’s field leader, most likely the one directing the mutants on the ground.
• Mystique — Rebecca Romijn · @rebeccaromijn — A shape-shifting infiltrator whose loyalties are never a given — a natural wildcard in a story built on deception and disguise.
• Nightcrawler — Alan Cumming · @alancummingreally — A teleporter, which is invaluable for moving people around a battlefield that literally spans universes.
• Beast — Kelsey Grammer · (handle unverified) — The X-Men’s scientist and diplomat, a natural bridge between the mutants and the MCU’s big brains like Reed and Shuri.
• Gambit — Channing Tatum · @channingtatum — Fresh off his long-delayed debut in Deadpool & Wolverine, a charming, kinetic wildcard the films have barely begun to use.

(A note on the handles: a cast this big is catnip for impostor pages, so we’ve listed only accounts we could verify — watch the exact spellings, like @vanessa__kirby with two underscores and @alancummingreally, not @alancumming. Where an actor has no public account, has deleted theirs, or we couldn’t confirm which is real, we’ve said so rather than guess; and we don’t list handles for the minors in the cast.)

The wishlist that isn’t the call sheet

A multiverse crossover is catnip for “leaked full cast” lists that quietly blend confirmed names with pure hope. As of now, these are rumour, not roster:

• Tobey Maguire and Andrew Garfield — the fan-favourite Spider-Men, endlessly expected after No Way Home, but never confirmed (Garfield has openly denied involvement).
• Hugh Jackman’s Wolverine — despite the whole X-Men reunion, he’s not on the list. Nor are Halle Berry (Storm) or Anna Paquin (Rogue).
• Tom Holland’s Spider-Man — busy with Spider-Man: Brand New Day; not on the Doomsday roster.
• Benedict Cumberbatch (Doctor Strange), Elizabeth Olsen (Scarlet Witch), Samuel L. Jackson (Nick Fury), Mark Ruffalo (Hulk) — all assumed, none confirmed. Ryan Reynolds’ Deadpool is unconfirmed too.

Two more clean-ups. The official CinemaCon roster pointedly leaves out most of the old Endgame guard — the likes of Jeremy Renner and Hayley Atwell aren’t on it — so don’t assume everyone comes back. And the viral “Disney cut 12 actors from Doomsday” headlines don’t survive a second look: they trace to aggregator clickbait, and no actor from Marvel’s official reveal has been confirmed as removed or recast. Until a trailer or Marvel says otherwise, treat any dramatic “final cast leak” as noise.

What Doomsday is probably about — going by the comics

Read this whole section as speculation. Marvel has released no plot, and directors Joe and Anthony Russo have called the comics only “loose inspiration.” What follows is the comic story the film is clearly built on, and how it lines up with what the MCU has already shown — the map, not the movie’s confirmed itinerary. Where it’s a comic event, we say so.

The setup: incursions and a dying multiverse

The MCU has spent its whole “Multiverse Saga” laying one piece of track. In the comics, the road to Secret Wars is the “incursion”: when two parallel universes drift together, their two Earths become collision points, and unless one Earth is destroyed, both universes are annihilated. Faced with that, the comics’ brain trust (the Illuminati — Reed Richards, Tony Stark, Doctor Strange and others) are dragged into an unthinkable question: would you blow up another populated Earth to save your own?

The MCU has already dramatised this exact idea. Doctor Strange in the Multiverse of Madness (2022) literally defines an incursion on screen as two universes crashing into one, and shows a world levelled by one. Loki and the Kang films, meanwhile, established a fragile multiverse and a “multiversal war.” So the ingredients — colliding realities, a shattering timeline, heroes scattered across universes — are already in place. Doomsday looks like the moment they finally detonate.

The comic it all points to: Secret Wars

There are two Secret Wars. The 1984 original (Jim Shooter) is where the name and the concept come from: a near-omnipotent being called the Beyonder yanks Marvel’s heroes and villains onto a cobbled-together planet, Battleworld, and makes them fight — with Doctor Doom, typically, reaching for godhood.

But the one the MCU is chasing is Jonathan Hickman’s Secret Wars (2015). In it, the incursions finally win: reality-ending entities push the multiverse to total collapse, and everything dies. In the wreckage, Doctor Doom — working with Doctor Strange and a reality-warping figure called the Molecule Man — seizes the leftover cosmic power for himself. He uses it to salvage scraps of dead universes and stitch them into a single patchwork planet, a new Battleworld divided into domains, each ruled by a lord who answers to him.

God-Emperor Doom — and the twist that makes it tragic

On that Battleworld, Doom rules as a literal god, its people wiped of any memory of the worlds that came before. And in the comic’s most pointed touch, he doesn’t just take power — he takes Reed Richards’ life: he installs Sue Storm as his wife and Reed’s children as his own. (That is a comic-book beat, not a confirmed film plot — but it’s why casting Reed, Sue and Doom in the same movie is loaded.)

The story’s engine isn’t cosmic; it’s personal. Doom and Reed Richards are lifelong rivals — Doom blames Reed for the accident that scarred his face, and envies his intellect. The comic ends by stripping Doom’s stolen power so the two can face each other as equals, and Reed lands the knife: the first thing Doom did with the power of a god was steal Reed’s family, because deep down he wanted to be Reed. It’s Reed who then rebuilds the multiverse. If the films keep any of the comic’s soul, expect that Doom-versus-Reed rivalry — not the light show — to be the spine.

Why Doom, and why he wears Tony Stark’s face

Casting Robert Downey Jr., the MCU’s Iron Man, as its new archvillain looks like a stunt until you check the comics. In Infamous Iron Man (2016), with Tony Stark out of the picture, Doctor Doom picks up the Iron Man armour himself and tries to be a hero — the canonical precedent for Doom and Iron Man’s identities merging. Whether the movie leans on that, explains Doom’s Stark-like face as a multiverse variant (a Tony who became Doom in another reality), or does something else entirely, is unconfirmed — but the shared face is almost certainly a plot point, not an accident.

The most likely shape of the two films

Marvel’s own logline says the heroes come “from three distinct universes” on “a deadly collision course,” and the cast bears that out — the MCU, the Fantastic Four’s world and the Fox X-Men, three realities crashing together. Reading the comics onto that, the likely (still unconfirmed) split is:

• Avengers: Doomsday — the collision: incursions tearing universes apart, heroes from three worlds thrown together, and Doom rising as the threat (or false saviour) at the centre of it.
• Avengers: Secret Wars (2027) — the aftermath: Battleworld, God-Emperor Doom, and the fight to undo it — the kind of universe-resetting finale that could quietly fold the X-Men and Fantastic Four into the main MCU going forward. The Russos have described the two-film arc as taking Marvel “back to Phase Zero.”

What we still don’t know

Plenty. Marvel hasn’t confirmed the plot, so the open questions are real: how the film explains Doom’s face; whether this Steve Rogers, or any returning hero, is the original or a variant; who lives and who dies; how much of the grim “everything dies” comic Marvel is willing to film; and how the X-Men and Fantastic Four end up staying in the MCU afterwards. The comics tell you the shape of the story Marvel is chasing — but the MCU has already proven it will change the details freely (it dropped Kang and rebuilt the whole saga around Doom). Treat God-Emperor Doom, Battleworld, the Molecule Man and Doom-as-Iron-Man as the flavour of what’s coming, not a leak of the script.

December 18, 2026 — the biggest release-day standoff in years

Here’s a wrinkle even some fans miss. Doomsday shares its opening day with Denis Villeneuve’s Dune: Part Three — a face-off the industry has already nicknamed “Dunesday.” Because Dune 3 was shot with IMAX cameras, it has locked North America’s IMAX screens for three weeks, which means Doomsday is not expected to play in IMAX in the US on opening weekend; it launches domestically in other premium formats, with IMAX in some international markets. If seeing it on the biggest possible screen matters to you, that’s worth planning around.

The film wrapped shooting in England in September 2025 and is deep in post-production, with some reshoots in early 2026. A full trailer was shown privately to CinemaCon in April 2026; with Marvel’s Comic-Con panel set for late July 2026, a first public trailer is widely expected around then, though the studio hasn’t dated it.

And then? Secret Wars

Doomsday is the penultimate chapter of the Multiverse Saga — the collision. The finale, Avengers: Secret Wars, is currently dated 17 December 2027, and is expected to be the resolution and the reset that carries the MCU into whatever comes next. The Russos have described the two-film arc as taking Marvel “back to Phase Zero.”

The bottom line

Strip away the rumours and Doomsday is still staggering: a confirmed cast that reunites the Avengers, the Fantastic Four, Wakanda, the Thunderbolts and the original X-Men, all pulled together by a Doctor Doom wearing Iron Man’s face. The lineup is real; the plot is still a locked box, and the comics only hint at what’s inside. With a first trailer expected around Comic-Con, the noise is about to get much louder — but the honest scoreboard today is one jaw-dropping call sheet, and a story we don’t get to actually see until 18 December 2026.

Frequently asked questions

Is Robert Downey Jr. playing Iron Man in Avengers: Doomsday?

No — he returns as the villain Doctor Doom (Victor von Doom), a different character from Tony Stark. Marvel revealed the casting at Comic-Con in July 2024 after dropping its previous villain, Kang.

Are the original X-Men really in Avengers: Doomsday?

Yes. The 20th Century Fox X-Men actors are confirmed, including Patrick Stewart (Professor X), Ian McKellen (Magneto), James Marsden (Cyclops), Rebecca Romijn (Mystique), Alan Cumming (Nightcrawler) and Kelsey Grammer (Beast). Hugh Jackman’s Wolverine, however, is not confirmed.

Are Tobey Maguire and Andrew Garfield in it?

Not confirmed. Their return is one of the biggest fan rumours, but neither has been officially announced — and Garfield has publicly denied it.

What is Avengers: Doomsday about?

Marvel hasn’t released a plot. Based on the comics it draws on — chiefly Jonathan Hickman’s Secret Wars — it’s widely expected to involve multiverse “incursions” and to set up Battleworld for Avengers: Secret Wars, with Doctor Doom as the central threat. That’s informed speculation, not a confirmed synopsis.

When does Avengers: Doomsday come out, and is it in IMAX?

18 December 2026. In North America it isn’t expected to play in IMAX on opening weekend, because Dune: Part Three — out the same day — has the IMAX screens booked for three weeks.

More of the year’s biggest films: our Dune 3 cast, novel and potential ending (its same-day rival), and The Odyssey cast, plot and ending.