Robert Downey Jr. debuts as Doctor Doom as the trailer unites the Avengers, Fantastic Four and X-Men, while Chris Evans returns as Steve Rogers ahead of the film’s December release

The first trailer for 'Avengers: Doomsday' is here, featuring Robert Downey Jr.'s Doctor Doom fighting the X-Men, Fantastic Four and more.

Ahead of the superhero feature hitting theaters later this year, Disney helped to iron out some details about the sequel with the new footage released online.

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Superheroes from across the Marvel universe face a new supervillain in the upcoming film