- Releases December 18, 2026 in theaters worldwide
- Robert Downey Jr. plays Victor von Doom, NOT Tony Stark
- Directed by Joe and Anthony Russo
- Cast spans the Avengers, the Fantastic Four, the X-Men and the Wakandans
- Sebastian Stan warns it could be ‘probably heartbreaking’
- The Avengers: Endgame re-release (from September 25) included new footage tied to Doomsday
Two months from now, the biggest Marvel event in seven years hits theaters, and its biggest star is playing the villain. Avengers: Doomsday arrives December 18, 2026, with Robert Downey Jr. returning to the MCU — not as Iron Man, but as Doctor Doom.
The return nobody expected
When Marvel revealed at Comic-Con 2024 that Downey would return as Doctor Doom, it stunned fans still mourning Tony Stark’s death in Endgame. Marvel has confirmed his character is Victor von Doom, a new character — not a Tony Stark variant. Downey himself framed it as a creative swing: Marvel loves a challenge, and the role is meant to give the next mega-crossover its own identity.
A villain built like Thanos
Downey has compared Doomsday’s approach to how Marvel introduced Thanos in Infinity War: gradually revealing layers of the character rather than front-loading everything. He calls Doomsday an introduction to Doom’s story, designed to reward longtime comic readers while staying accessible to newcomers.
Three universes, one collision
The film brings together the Avengers, the Fantastic Four (Pedro Pascal as Mr. Fantastic, Vanessa Kirby as Sue Storm), the X-Men, the Wakandans and the New Avengers. Chris Hemsworth returns as Thor, Anthony Mackie continues as Captain America, and Chris Evans is back as Steve Rogers. Marvel’s official setup: heroes from three distinct universes headed for a deadly collision.
Why the cast says brace yourself
Sebastian Stan, back as Bucky Barnes, told Decider he expects the film to be ‘probably heartbreaking’ — though he admits he has not seen the finished movie and confirmed nothing about who survives. Director Anthony Russo says audiences arrive with deep emotional connection to the MCU, and the film aims to honour that investment and take it somewhere new.
What to watch before December 18
The Endgame re-release (in theaters since September 25) carries new footage tied directly to Doomsday. And Marvel’s year started with Spider-Man: Brand New Day became the third-biggest film ever. Source: The Express Tribune reports.
December 18 is close. If the cast is right, bring tissues.