Robert Downey Jr.’s Doctor Doom could turn several powerful Marvel Cinematic Universe superheroes into villains in Avengers: Doomsday. Marvel Studios has already confirmed 27 actors set to appear in the Russo brothers’ upcoming Avengers: Doomsday, including many of the MCU’s most notable heroes. With many more stars expected to be announced in the coming weeks, […] The post 4 Marvel Heroes That Could Actually Be Villains in Avengers: Doomsday appeared first on ComicBook.com .