The Marvel Cinematic Universe (MCU) is gearing up for its next massive ensemble film, Avengers: Doomsday, set to release in 2026. Directed by the Russo brothers, Anthony and Joe Russo, this film promises to be a game-changer for the franchise, especially with its star-studded cast. One of the biggest surprises? Robert Downey Jr. is reportedly returning—but not as Iron Man. Instead, he’s rumored to be playing the iconic villain Doctor Doom.
In this blog post, we’ll break down the Avengers: Doomsday cast, explore the potential roles, and discuss how this film could reshape the future of the MCU.
The Russo Brothers Return to the MCU
Before diving into the cast, it’s important to note that Avengers: Doomsday is being helmed by the same directors who brought us Avengers: Infinity War and Avengers: Endgame. Their track record with large-scale superhero storytelling makes them the perfect choice for this project.
Plot details are still under wraps, but given the title, we can expect a catastrophic threat—possibly involving Doctor Doom and the Fantastic Four, who are finally making their MCU debut.
Confirmed and Rumored Cast Members
1. Robert Downey Jr. as Victor von Doom (Doctor Doom)
The most shocking casting rumor is that Robert Downey Jr., who famously played Tony Stark/Iron Man, might return as Doctor Doom.
- Why This Makes Sense:
- Downey has the charisma and acting range to portray Doom’s genius intellect and menacing presence.
- Marvel has a history of repurposing actors in new roles (e.g., Gemma Chan as Minn-Erva and Sersi).
- Doom is one of Marvel’s most complex villains, and Downey could bring a fresh, terrifying take.
- Potential Storyline:
- If Doom is introduced as a variant from another universe, it could explain why he resembles Tony Stark.
- He might be the one who triggers the “Doomsday” event, forcing the Avengers to reassemble.
2. Pedro Pascal as Reed Richards/Mr. Fantastic
After years of speculation, Pedro Pascal (The Last of Us, The Mandalorian) is reportedly playing Reed Richards, leader of the Fantastic Four.
- Why He’s Perfect for the Role:
- Pascal has the charm, intelligence, and leadership qualities needed for Marvel’s smartest hero.
- His experience in both action and dramatic roles makes him a strong fit.
3. Vanessa Kirby as Sue Storm/Invisible Woman
Vanessa Kirby (Mission: Impossible, The Crown) is rumored to be playing Sue Storm, bringing both strength and emotional depth to the role.
4. Joseph Quinn as Johnny Storm/Human Torch
Fresh off Stranger Things and Gladiator II, Joseph Quinn could bring youthful energy to Johnny Storm.
5. Ebon Moss-Bachrach as Ben Grimm/The Thing
Coming off his Emmy-winning role in The Bear, Ebon Moss-Bachrach is reportedly playing the ever-lovable Ben Grimm. His ability to balance humor and heartache makes him ideal for the role.
Returning MCU Heroes
Several familiar faces from past Marvel films are expected to return:
- Florence Pugh as Yelena Belova – The new Black Widow could play a key role.
- Anthony Mackie as Sam Wilson/Captain America – Leading the Avengers in the post-Endgame era.
- Sebastian Stan as Bucky Barnes – Likely teaming up with Sam once again.
- Tom Hiddleston as Loki – Given the multiverse chaos, his return is almost guaranteed.
- Chris Hemsworth as Thor – Will the God of Thunder return for another battle?
- Paul Rudd as Scott Lang/Ant-Man – After Quantumania, his role could be crucial.
- Simu Liu as Shang-Chi – His growing importance in the MCU suggests a major part.
X-Men Joining the Fight?
With the multiverse in play, Avengers: Doomsday might finally bring mutants into the MCU.
- James Marsden as Cyclops – Reprising his role from Fox’s X-Men films?
- Channing Tatum as Gambit – A long-awaited debut.
- Alan Cumming as Nightcrawler – Possibly returning after X2.
- Rebecca Romijn as Mystique – Could she be a wild card in the conflict?
The Big Threat: What Is “Doomsday”?
While plot details are scarce, the title suggests an apocalyptic event. Possible scenarios:
- Doctor Doom’s Rise – Using advanced technology and magic, Doom could declare war on Earth.
- Secret Wars Adaptation – The Russo brothers have expressed interest in adapting this storyline, where Doom becomes a god-like ruler.
- Multiverse Collapse – Incursions (as seen in Doctor Strange 2) could lead to a catastrophic battle.
Final Thoughts
Avengers: Doomsday is shaping up to be one of the most ambitious MCU films yet. With a mix of returning heroes, new faces, and potential X-Men crossovers, this movie could redefine the franchise.
Robert Downey Jr.’s rumored return as Doctor Doom would be a bold move, proving that Marvel isn’t afraid to take risks. If executed well, this could be the ultimate comeback story—both for Downey and for the MCU.
Are you excited about the Avengers: Doomsday cast? Who are you most looking forward to seeing? Let us know in the comments!
Stay tuned for more updates as we approach the 2026 release!