The first footage of Avengers: Doomsday is expected to premiere in theaters this December alongside another major Disney release.
Although the film itself won’t hit theaters until December 18, 2026, fans might get a teaser much sooner. Multiple sources told Collider that the trailer will debut with Avatar: Fire and Ash, Disney’s latest blockbuster.
If this plan remains unchanged, audiences will see the first look at Robert Downey Jr.’s titanium-masked supervillain starting December 19, 2025.
Marvel has remained tight-lipped about many crossover details. Even cast members have limited information: Alan Cumming, who will return as Nightcrawler, shared he started filming before the script was completed.
"I began filming before the script was finished."
— Alan Cumming
The Avengers: Doomsday trailer is set to debut in December 2025 with Avatar: Fire and Ash, offering fans an early glimpse of the anticipated MCU event.