Who will all these heroes face off against this entry to the Avengers franchise? None other than Robert Downey Jr., who's stepping into a new role with a fresh mask as the villainous Doctor Doom. Downey Jr., of course, played Tony Stark/Iron Man in the previous "Avengers" films.

This comes right after it's been confirmed several members of the Thunderbolts* cast will feature among the heroes in Avengers: Doomsday. Marvel sprang an hours-long livestream on the internet on March 26, 2025, revealing everyone's seat for production of the studio's next tentpole team-up extravaganza.