6TH UPDATE 3/26: Channing Tatum will reprise his role as Gambit in Avengers: Doomsday.

5TH UPDATE 3/26: James Marsden‘s Cyclops/Scott Summers has joined the cast of Avengers: Doomday.

4TH UPDATE 3/26: Rebecca Romijn‘s Mystique will appear in Avengers: Doomsday.

3RD UPDATE 3/26: Alan Cumming‘s Kurt Wagner/Nightcrawler has now been announced as part of the Avengers: Doomsday cast.

2ND UPDATE 3/26: Ian McKellen will return as Magneto in Avengers: Doomsday.

UPDATE 3/26: It has now been announced that Patrick Stewart‘s Charles Xavier will return in Avengers: Doomsday as well.

ORIGINAL STORY: Kelsey Grammer will return to the MCU in Avengers: Doomsday.

On Wednesday, March 26, 2025, the official Marvel Entertainment YouTube page started a live video announcing the cast of Avengers: Doomsday. So far, at the time of this article’s publication, the cast announced in the video includes Chris Hemsworth, Vanessa Kirby, Anthony Mackie, Sebastian Stan, Letitia Wright, Paul Rudd, Wyatt Russell, Tenoch Huerta, Ebon Moss-Bachrach, Simu Liu, Florence Pugh, Grammer, Lewis Pullman, Danny Ramirez.

Watch the live video here:

Grammer originally played Dr. Hank McCoy/Beast in 2006’s X-Men: The Last Stand, while he also had an uncredited cameo in 2014’s X-Men: Days of Future Past. His character then reappeared during the mid-credit scene of 2023’s The Marvels, with that being Beast’s official introduction to the MCU.

It’s unclear how big of a role that Grammer will have in Avengers: Doomsday. His inclusion does suggest that Teyonah Parris’ Monica Rambeau may also be part of the Doomsday cast, as she woke up in a parallel universe only to be greeted by Beast during The Marvels’ mid-credit scene.

Grammer’s casting also begs the question of how large of a role the X-Men will have in Doomsday, as both of the forthcoming Avengers movies are expected to formally kick off new mutant-focused stories for the MCU. Whether or not any other former X-Men actors will show up in Doomsday and Secret Wars remains to be seen.

Avengers: Doomsday is being directed by Joe and Anthony Russo, also known as the Russo Brothers. That movie is scheduled to hit United States theaters on May 1, 2026, from Marvel Studios.

Avengers: Secret Wars, which is also being helmed by the Russo, then arrives on May 7, 2027. Spider-Man 4 with Tom Holland will be released in-between those two movies on July 31, 2026.

Originally reported by Brandon Schreur at SuperHeroHype.