Marvel Studios released the official trailer for Avengers: Doomsday on July 20, 2026. The film hits theaters December 18, bringing together the Avengers, Fantastic Four, and X-Men across three universes for a showdown with Doctor Doom.

Robert Downey Jr. plays the titular villain. The Russo Brothers direct. The trailer shows beloved heroes on a collision course with an existential threat unlike anything they’ve faced. It’s the MCU’s biggest ensemble film since Endgame.

Who’s in This Movie

The trailer confirms the Avengers, Fantastic Four, and X-Men all appear. That means Spider-Man, the Guardians, and other heroes are likely involved or referenced. The scope is enormous. The Russos have said they’re bringing the entire Marvel Universe into frame.

Tom Holland, Ryan Reynolds, and other stars confirmed their roles at Comic-Con 2024. This trailer gives the first real footage of them alongside Doctor Doom and other characters fans haven’t seen before in the MCU.

Why December 2026 Matters

Avengers: Doomsday is the first of two new Avengers films. Secret Wars follows. The Russos have three years to tell this story across two films. That’s different from the Infinity Saga, which played out across many movies. Here, two films carry the entire narrative weight.

December 18 is Christmas season—the biggest moviegoing weekend of the year. Marvel is betting on cultural impact and box office dominance during the holidays.

Infinity Vision and Premium Format

Tickets are on sale now in Infinity Vision, a new premium large-format certification for theaters. It guarantees big screens, bright images, and outstanding sound. This is Marvel’s play to get audiences into IMAX-equivalent experiences, not home viewing.