Confirmed Cast & Characters
31 confirmed cast members — returning Avengers, the Fantastic Four, and Robert Downey Jr. back as Doctor Doom.
Verified 2026-08-12. Marvel has said further casting is unannounced, so this list is not final — we update it as names are confirmed.
Robert Downey Jr. returns to the MCU — but not as Tony Stark. He plays Doctor Doom, making his return one of the most dramatic recastings in franchise history.
Avengers
X-Men
Fantastic Four
Thunderbolts
Wakanda
New Heroes
Villains & Allies
How to Prepare for Doomsday
With 31 characters converging, preparation matters. These are the key titles to watch before Avengers: Doomsday — grouped by which cast members they introduce or develop.
All Avengers films + Falcon & Winter Soldier + Loki S1 & S2 + Captain America: Brave New World
The Fantastic Four: First Steps (2025) — their MCU origin. No prior films required.
Daredevil: Born Again + Hawkeye + Black Widow (for Yelena) + Falcon & Winter Soldier (for US Agent)
No MCU solo film — Avengers: Doomsday is his introduction. Robert Downey Jr. plays an entirely new character.
Frequently Asked Questions
Who is in the cast of Avengers: Doomsday?
31 cast members confirmed as of 2026-08-12: Anthony Mackie (Captain America), Chris Evans (Steve Rogers), Chris Hemsworth (Thor), Pedro Pascal (Reed Richards), Robert Downey Jr. (Doctor Doom), the full Fantastic Four team, and many more. Marvel has said further casting remains unannounced, so this list is not final.
Who is Robert Downey Jr. playing in Avengers: Doomsday?
Robert Downey Jr. returns as Doctor Doom — not Tony Stark. This is a brand-new character role. Doctor Doom is one of Marvel's most powerful villains and ruler of Latveria.
Are the Fantastic Four in Avengers: Doomsday?
Yes. Pedro Pascal (Reed Richards), Vanessa Kirby (Sue Storm), Joseph Quinn (Human Torch), and Ebon Moss-Bachrach (The Thing) are all confirmed — crossing over from The Fantastic Four: First Steps (2025).
What should I watch before Avengers: Doomsday?
The story runs back through 45 titles. The most recent of them are Loki (Season 2), Deadpool & Wolverine, Captain America: Brave New World, Thunderbolts*, and The Fantastic Four: First Steps. The full list, graded, is on the Before Doomsday guide.