Note: This post contains potential spoilers for Avengers: Doomsday.
Marvel Studios is now filming important reshoot scenes for Avengers: Doomsday, which are tied to the continuation of The Marvels post-credits scene.
According to insider James Mack, Teyonah Parris (Monica Rambeau), Lashana Lynch (Binary), Kelsey Grammer (Beast), Patrick Stewart (Professor Charles Xavier), and another X-Men actor (in a quick cameo) will film additional scenes for Avengers: Doomsday, continuing the post-credits scene from The Marvels.

We have already reported that reshoots have begun, with Parris’ Monica Rambeau spotted on the set of Doomsday. In The Marvels post-credits scene, Parris’ Monica Rambeau was trapped in the X-Men universe after sealing a rift between realities.
In Doomsday, there will be an incursion between Earth-616 and Monica’s universe (Earth-10005), where the X-Men reside. Sam Wilson, Thor, Captain Marvel, Shang-Chi, Ant-Man (Scott Lang), Jennifer Walters, Yelena Belova, Bucky Barnes, Bob, Bruce Banner, Shuri, M’Baku, Namor, and the Fantastic Four are tasked with resolving the incursion between the two worlds, rescuing Monica Rambeau, and protecting Loki at the Citadel after discovering the TVA and Doctor Doom’s plan. Meanwhile, John Walker, Ghost, and Red Guardian remain on Earth-616 alongside other Avengers to protect the planet from an unknown invasion. The remaining Thunderbolts unite with Wakanda, Talokan, and the sorcerers led by Wong to help defend Earth.

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, revealed by Disney China:
“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!”
As of now, the announced cast members of Avengers: Doomsday are: Downey Jr. as Doctor Doom, 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, 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, and Hannah John-Kamen as Ghost. 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, and Channing Tatum as Gambit. 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), and Lewis Pullman as Sentry.
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, and Avengers: Secret Wars is scheduled for release on December 17, 2027.
Source: James Mack/X