Marvel Studios will reportedly introduce new one-time heroes and villains in the upcoming Avengers: Doomsday and Avengers: Secret Wars.
According to insider source Cryptic HD QUALITY on X (formerly Twitter), the upcoming Avengers movies will feature a few one-off heroes and villains — characters we’ve never seen before. They likely won’t appear again after the saga ends.
The source said, “I hear they will introduce a few one-off heroes/villains we’ve never seen for both Doomsday and SW. You’ll probably never see them again on the big screen after this saga ends.”
What is the Plot Details of Avengers: Doomsday?

In Avengers: Doomsday, the MCU will begin its end. As the multiverse teeters on the brink of total collapse, the Avengers must reunite to face their greatest threat yet — incursions, catastrophic collisions between realities that threaten to annihilate the entire multiverse. Earth’s Mightiest Heroes must race against time to save their reality while confronting the powerful force behind it all: Victor Von Doom (Robert Downey Jr.).
The film is directed by Joe and Anthony Russo, from a screenplay by their longtime collaborator Stephen McFeely.
The film stars 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, 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, 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. 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), and Lewis Pullman as Sentry.
According to Marvel President Kevin Feige, the full cast for Avengers: Doomsday has not yet been revealed. He also confirmed that the film will focus on the Avengers, Wakandans, Fantastic Four, Thunderbolts, and the original X-Men all fighting Doctor Doom.
Produced by Feige, Louis D’Esposito, and Russo Brothers will produce through their AGBO banner.
Avengers: Doomsday hits theaters on May 1, 2026, and Avengers: Secret Wars on May 7, 2027.