The third teaser trailer for Avengers: Doomsday seems to have surfaced online unexpectedly, centering on the X-Men engaged in a catastrophic confrontation.
As previously confirmed, Avengers: Doomsday will include several X-Men characters portrayed by their original actors, such as Kelsey Grammer as Beast, Patrick Stewart as Professor X, Ian McKellen as Magneto, Alan Cumming as Nightcrawler, Rebecca Romijn as Mystique, and James Marsden as Cyclops.
Spoiler warning: The following contains potential spoilers for Avengers: Doomsday.
The leaked teaser trailer paints a grim picture of the mutant team's fate, setting a tone of desperation and high-stakes action that aligns with the Marvel Cinematic Universe's escalating multiversal threats. It begins amidst the smoldering ruins of the X-Mansion, where the iconic "Xavier's School for Gifted Youngsters" sign lies shattered in the debris, symbolizing the destruction of a sanctuary that has long represented hope for mutants. Professor X, seated in his classic wheelchair emblazoned with the "X" emblem, shares a poignant moment with Magneto, who sports long hair and a beard, evoking a more contemplative version of the master of magnetism. The two engage in a game of chess, a nod to their complex history of rivalry and alliance, culminating in a brotherly gesture as they clasp hands, underscoring themes of unity in the face of impending doom.
From there, the footage shifts to a chaotic battlefield, where a bloodied Cyclops takes center stage. Portrayed in a strikingly comic-accurate costume that fans of the source material will appreciate—complete with the sleek visor and tactical design inspired by 1990s X-Men aesthetics—James Marsden's Scott Summers appears as the last mutant standing. In a moment of raw intensity, he tears off his visor, unleashing a powerful optic blast skyward amid the chaos. The background reveals the ominous presence of a massive Sentinel, the giant mutant-hunting robot that has been a staple villain in X-Men lore, its enormous boot looming nearby as the X-Mansion erupts in flames. This sequence suggests a desperate final stand, with Cyclops potentially sacrificing himself to protect his teammates, echoing the sacrificial heroism seen in previous MCU epics like Avengers: Infinity War.
Magneto's voiceover adds a layer of philosophical dread, intoning that death comes for everyone eventually, which ties into the broader narrative of Avengers: Doomsday. The trailer implies that this devastating attack on the X-Mansion could be part of a larger incursion orchestrated by Robert Downey Jr.'s Doctor Doom, who steps into the role as the MCU's new overarching antagonist following the pivot from the Kang storyline. As reported by CBM, the teaser concludes with on-screen text proclaiming "The X-Men Will Return In Avengers: Doomsday," followed by a countdown to the film's premiere, hinting at the mutants' integration into the larger Avengers ensemble despite the apparent catastrophe.
This leaked teaser for Avengers: Doomsday highlights the film's ambitious integration of Fox-era X-Men into the MCU, directed by the Russo brothers—who previously delivered Avengers: Infinity War and Avengers: Endgame. With Robert Downey Jr. returning as the new antagonist Doctor Doom, the story is set to unite Avengers with multiversal allies, including the X-Men, building on Disney's 2019 acquisition of 20th Century Fox.
The footage spotlights Cyclops in a comic-accurate costume, finally showcasing James Marsden's portrayal of the character's leadership and resolve—qualities often overshadowed in prior adaptations by figures like Wolverine. The looming Sentinel and burning X-Mansion raise intriguing questions about how anti-mutant threats tie into Doom's plans, promising intense action that honors the mutants' legacy.
The trailer's apocalyptic tone teases survivor alliances in the larger multiverse saga, potentially leading into Avengers: Secret Wars in 2027, with the X-Mansion's destruction symbolizing a rebirth for the team alongside heroes like Spider-Man and Captain America.
Avengers: Doomsday is set to release on December 18, 2026.
