Marvel Studios has officially confirmed the long-awaited arrival of the X-Men into the Marvel Cinematic Universe with the release of the first trailer for Avengers: Doomsday.
The newly released footage confirms the return of Patrick Stewart as Professor Charles Xavier, Ian McKellen as Magneto, and James Marsden as Cyclops, marking the first time the iconic mutant characters appear in an MCU Avengers film.
The trailer features clear appearances of the X-Men characters, ending years of speculation about how and when Marvel would integrate mutants following Disney’s acquisition of 20th Century Fox.
Patrick Stewart and Ian McKellen reprise their roles as longtime rivals Professor X and Magneto, while James Marsden returns as Scott Summers / Cyclops, making his first on-screen appearance in the franchise since X-Men: Days of Future Past.
Their inclusion confirms that Avengers: Doomsday will serve as a major crossover event, bringing together legacy Marvel characters and current MCU heroes under one storyline.
Beyond the confirmed X-Men appearances, the Avengers: Doomsday trailer establishes a darker, large-scale conflict tied to the rise of Doctor Doom, who is positioned as the central threat of the film.
Release Information
Avengers: Doomsday is scheduled for theatrical release in December 18, 2026 and is expected to be followed by Avengers: Secret Wars, which will further explore the multiverse and its consequences.