Avengers: Doomsday Cast — 15+ Confirmed & Rumored Stars That Will Change The MCU Forever

The anticipation for Marvel's *Avengers: Doomsday* has reached a fever pitch, with the film slated to be one of the final, universe-shattering chapters of the Multiverse Saga. As of December 18, 2025, the confirmed and rumored cast list is a stunning tapestry of returning veterans and new heroes, promising a cinematic event unlike anything seen since *Avengers: Endgame*. The biggest shockwave in the fandom, however, revolves around the main antagonist and a major former MCU star's rumored return in a completely new role. The film, currently set for a May 1, 2026, release date, will serve as the first part of a two-part finale, preceding *Avengers: Secret Wars*. The sheer scale of the ensemble cast is unprecedented, with reports suggesting up to 27 past Marvel stars are set to return. This article breaks down every confirmed hero, the shocking villain reveal, and the most compelling rumors that are setting the stage for the MCU's next era.

The New Avengers Lineup: Confirmed Heroes for Doomsday

The core team of the Avengers has fundamentally changed since the events of *Endgame*. *Avengers: Doomsday* will solidify the new leadership and introduce key players from Phase 4 and Phase 5 into the main event. This new roster is expected to face a threat so immense that it will require a divided, multi-front war.

Confirmed Cast Members and Their Roles

The following actors and characters have been either officially confirmed or heavily reported by multiple reliable sources to have signed on for *Avengers: Doomsday*:

• Anthony Mackie as Captain America (Sam Wilson): Following his journey in *The Falcon and the Winter Soldier* and *Captain America: Brave New World*, Sam Wilson steps up as the definitive leader of the new Avengers.
• Chris Hemsworth as Thor: The God of Thunder is confirmed to return, continuing his long-standing tenure in the MCU. His presence is crucial for the cosmic scale of the threat.
• Sebastian Stan as Bucky Barnes/Winter Soldier: Bucky's evolution from a brainwashed assassin to a trusted hero will culminate here, likely fighting alongside Captain America.
• Vanessa Kirby as Sue Storm/Invisible Woman: A monumental crossover, Kirby's Sue Storm from the upcoming *Fantastic Four* film is confirmed to be part of the *Doomsday* ensemble, signaling a major integration of the First Family into the main Avengers narrative.
• Paul Rudd as Ant-Man (Scott Lang): Despite the Multiversal chaos, the presence of Scott Lang, a veteran of the previous Avengers lineup, provides necessary heart and comic relief.
• Florence Pugh as Yelena Belova: The former Black Widow operative and new fan-favorite is confirmed, continuing her role as a key figure in the next generation of heroes.
• Danny Ramirez as Joaquin Torres/Falcon: Torres, who took on the mantle of the new Falcon, is confirmed to appear, further building out the new team's ground-level support.
• Tom Hiddleston as Loki: Intriguingly, Loki is also listed among the confirmed cast, likely in his role as the guardian of the Sacred Timeline following the events of *Loki* Season 2. His involvement would be pivotal to resolving the Multiverse Saga's core conflict.

The inclusion of Sue Storm is particularly significant. It confirms that the events of *Avengers: Doomsday* will directly tie into the *Fantastic Four* film, establishing the team as central to the MCU's Phase 6 narrative. The new Avengers team will be a mix of legacy heroes and new blood, a necessary evolution to face the "Doomsday" level threat.

The Shocking Villain Reveal: Robert Downey Jr.'s Doctor Doom

The biggest, most jaw-dropping news surrounding *Avengers: Doomsday* is the rumored casting of the main villain. According to multiple reports, the film's central antagonist will be none other than Victor Von Doom, the ruler of Latveria and one of Marvel's most iconic villains.

But the news doesn't stop there. In a move that would break the internet, Robert Downey Jr. is heavily rumored to be stepping into the iron mask of Doctor Doom. While unconfirmed by Marvel Studios, this casting has been a persistent and widely reported leak, suggesting a meta-narrative where the actor who launched the MCU returns as its most formidable new foe.

Doctor Doom's Role in Doomsday

Doctor Doom is not just a typical villain; his characterization in *Doomsday* is rumored to be complex and multi-faceted.

• A Protagonist or Anti-Hero: Some leaks suggest that Doctor Doom may not be a straightforward villain but a complex protagonist or anti-hero. His actions, while devastating, might be driven by a warped sense of necessity to save his own reality or even the wider Multiverse, setting him up as a dark mirror to Tony Stark's heroic sacrifice.
• Forming an Evil Team: To combat the Avengers, Doom is rumored to be assembling his own team of powerful antagonists. This "evil team" could draw from established MCU villains, creating a formidable force of eight or more different antagonists for the heroes to fight.
• The Russo Brothers' Return: The casting of Downey Jr. as Doom is often linked with the rumored return of directors Joe and Anthony Russo, and writer Christopher Markus and Stephen McFeely, the creative team behind *Avengers: Infinity War* and *Endgame*. Their involvement would lend massive credibility to the film's epic scale and emotional depth.

The Multiverse Saga's Final Stand: Rumored Returns and Plot Details

Beyond the confirmed core team and the Doctor Doom shocker, the casting rumors for *Avengers: Doomsday* are vast, hinting at a cinematic canvas that spans the entire history of the Marvel Cinematic Universe and incorporates characters from across the Multiverse. The "Doomsday" subtitle itself implies a world-ending, catastrophic event that will require all hands on deck.

High-Profile Rumored Castings

The list of highly rumored returning stars is extensive, pointing to a massive ensemble that will dwarf previous Avengers films:

• Mark Ruffalo as Bruce Banner/Hulk: The Hulk's presence is nearly essential for a world-ending event, and he is widely rumored to return in a significant capacity.
• Brie Larson as Captain Marvel (Carol Danvers): A key player in the cosmic side of the MCU, Captain Marvel is expected to have a major role in the final battle.
• Jeremy Renner as Clint Barton/Hawkeye: The veteran Avenger is rumored to return, potentially in a mentor role or for a final, crucial mission.
• David Harbour as Red Guardian: The inclusion of characters like Red Guardian and other *Black Widow* characters like Yelena suggests a major role for the new generation of heroes.
• Kelsey Grammer as Beast (Hank McCoy): The appearance of classic X-Men characters, such as Kelsey Grammer's rumored return as Beast, would confirm the full integration of mutants into the Multiverse Saga's climax.
• Patrick Stewart as Professor X: Following his cameo in *Doctor Strange in the Multiverse of Madness*, Patrick Stewart is also rumored to return, further bridging the gap between the Fox-era X-Men and the MCU.

The Divided Roster and Plot Implications

Leaks have strongly indicated that the *Avengers: Doomsday* cast will be divided into different teams, each tackling a separate front in the war against Doctor Doom and his rumored "evil team." This division is likely a strategic move to manage the massive cast and to allow for different thematic and geographical battles. One team might focus on a cosmic threat, another on a Multiversal incursion, and a third on a ground-level, political conflict in a location like Latveria. The sheer number of entities involved—from the Fantastic Four to the X-Men to the new Avengers—confirms that *Doomsday* is designed to be the ultimate team-up before the reality-bending events of *Secret Wars*. The film is not only about the action but also about setting the emotional stakes. With the rumored return of familiar faces in new roles, and the integration of the Mutants and Fantastic Four, *Avengers: Doomsday* is poised to be a pivotal, game-changing movie that will redefine the Marvel Cinematic Universe for the next decade. The coming months are sure to bring more official announcements, but for now, the picture of a colossal, star-studded, and deeply shocking ensemble cast is becoming clearer.