Marvel Studios has released the third official teaser for Avengers: Doomsday (December 18, 2026), focusing on the long-awaited return of the classic X-Men. Patrick Stewart as Professor X, Ian McKellen as Magneto, and James Marsden as Cyclops headline this emotional clip – their first major MCU appearance together.
The minute-long teaser premiered in theaters with Avatar: Fire and Ash screenings before hitting online January 6, 2026.
Teaser Breakdown: Key Moments
The clip opens in the abandoned Xavier Mansion – a somber tone sets in immediately.
Magneto (McKellen) delivers a powerful voiceover:
“Death comes for us all. That’s all I know for sure. The question isn’t ‘are you prepared to die?’ The question is ‘who will you be when you close your eyes?'”
We see Professor X (Stewart) and Magneto reunite over chess – their iconic rivalry mixed with deep friendship.
Then, Cyclops (Marsden) removes his visor and unleashes a massive optic blast as giant Sentinel legs appear in the background – hinting at a major threat.
The teaser ends with bold text: “The X-Men Will Return in Avengers: Doomsday.”
Fans love the 90s cartoon-inspired suits (especially Cyclops’ blue-and-yellow classic look).
Confirmed Classic X-Men Cast
This teaser confirms several Fox-era mutants joining Robert Downey Jr.’s Doctor Doom battle:
- Patrick Stewart – Professor X
- Ian McKellen – Magneto
- James Marsden – Cyclops
- Kelsey Grammer – Beast
- Alan Cumming – Nightcrawler
- Rebecca Romijn – Mystique
- Channing Tatum – Gambit
These variants bring nostalgia while setting up multiverse chaos.
Why This Teaser Has Fans Hyped
The emotional Xavier-Magneto moment hits hard – their chess scene echoes classic comics.
Sentinel tease suggests mutant persecution themes.
This is the third of four planned teasers (following Steve Rogers and Thor-focused ones).
Avengers: Doomsday arrives December 18, 2026 – directed by the Russo Brothers.
Which classic X-Men moment are you hoping for? Comment below!
