Warning: This post contains spoilers for Avengers: Doomsday.
The X-Men have arrived in the MCU. The third trailer for Marvel’s Avengers: Doomsday has been leaked online, which centers on the X-Men, featuring Professor X (Patrick Stewart), Magneto (Ian McKellen), and Cyclops (James Marsden).
We have exclusively got the full description for the Avengers: Doomsday third trailer. Here it is:
The trailer opens with dark scenes inside the X-Mansion. The camera then pans to the metal plate that says “Xavier’s School for Gifted Youngsters.” It moves slowly around the mansion until we see Xavier in the distance, seated in his chair.
His iconic chair then rolls into view. A king chess piece floats in the air, with Magneto blurred in the background. Erik and Charles reach out and hold hands.
The camera lifts to reveal Charles wearing a blue jacket with a black and red X symbol. He is still holding Erik’s hand and smiling. It then pans to Erik, who smiles back.
Then it cuts to Cyclops removing his visor. His face is covered in black (mud or blood) as a blast of energy erupts from his eyes.
A pair of massive metal legs (a Sentinel) move behind him. He is wearing the costume below without the trunks.

Directed by the Russo brothers from a screenplay by their longtime collaborator Stephen McFeely and Michael Waldron. The film features cinematography by Newton Thomas Sigel (Bohemian Rhapsody, X-Men: Days of Future Past) and production design by Kasra Farahani.
Here’s the plot synopsis for Avengers: Doomsday:
“Doctor Doom has officially arrived on the Marvel Cinematic Universe stage. This villain, a master of cutting-edge science and powerful magic, will unleash a cascading crisis across the multiverse. Marvel’s most iconic actor, Robert Downey Jr., also returns as Doctor Doom!”
Cast Details for Avengers: Doomsday:
- Robert Downey Jr. as Doctor Doom
- Chris Evans as Steve Rogers
- Paul Rudd as Ant-Man
- Simu Liu as Shang-Chi
- Tom Hiddleston as Loki
- Florence Pugh as Yelena Belova
- Danny Ramirez as Falcon
- Sebastian Stan as Bucky Barnes
- Winston Duke as M’Baku
- Chris Hemsworth as Thor
- Letitia Wright as Black Panther
- Tenoch Huerta Mejía as Namor
- Anthony Mackie as Captain America
- David Harbour as Red Guardian
- Wyatt Russell as U.S. Agent
- Hannah John-Kamen as Ghost
- Lewis Pullman as Sentry
X-Men cast:
- Ian McKellen as Magneto
- Patrick Stewart as Professor X
- Rebecca Romijn as Mystique
- James Marsden as Cyclops
- Kelsey Grammer as Beast
- Alan Cumming as Nightcrawler
- Channing Tatum as Gambit
Fantastic Four cast:
- Pedro Pascal as Reed Richards (Mr. Fantastic)
- Vanessa Kirby as Sue Storm (Invisible Woman)
- Joseph Quinn as Johnny Storm (Human Torch)
- Ebon Moss-Bachrach as Ben Grimm (The Thing)
Produced by Kevin Feige, Louis D’Esposito, and Russo Brothers will produce through their AGBO banner.
Avengers: Doomsday will be released in theaters and IMAX across the United States on December 18, 2026.








