Is doomsday based on a comic book character?

Avengers: Doomsday is an upcoming Marvel Studios film based on the Marvel Comics superhero team the Avengers. The title 'Doomsday' refers to the film's central conflict involving Doctor Doom, a longstanding Marvel Comics villain who will be portrayed by Robert Downey Jr. The movie brings together multiple Marvel teams—including the Avengers, X-Men, Fantastic Four, and others—from different universes to confront Doom. While the film's title includes 'Doomsday,' it does not directly reference the Superman comic storyline of the same name; instead, it leverages Doctor Doom's comic book origins as a mastermind antagonist. The Russo brothers, returning as directors, are expanding the Marvel Cinematic Universe's Phase Six narrative through this film, which is positioned as a sequel to Avengers: Endgame.