Marvel Studios unveiled footage from 'Avengers: Doomsday' at Comic-Con's Hall H, presenting Robert Downey Jr.'s MCU debut as Doctor Doom. The trailer portrays Doom as a figure broken by loss, with Sue Storm narrating his transformation from the world's cleverest mind into a vengeful antagonist. The footage culminates in Doom summoning an army of Sentinels to confront multiple hero teams, setting up a confrontation with Thor and others.

The film represents a landmark crossover bringing together previously separate Marvel franchises—Avengers, Fantastic Four, X-Men, and Thunderbolts—with an ensemble cast including Chris Evans, Chris Hemsworth, Pedro Pascal, and established X-Men actors making their MCU debuts. The project arrives 18 December 2026, following a year of anticipation from four preceding teaser trailers.