Marvel fans might need to clear their schedules next December. Reports surfacing across social media suggest Avengers: Doomsday is set to run approximately 3 hours and 45 minutes, including credits and post-credit scenes, potentially making it the longest Marvel Cinematic Universe film to date.
The report, which began circulating on X around January 6, 2026, would place Doomsday significantly ahead of Avengers: Endgame’s 3 hours and 1 minute runtime.
However, it’s crucial to note that Marvel Studios has not officially confirmed this duration, no press release, no trade publication verification, just waves of fan speculation that spread like wildfire across YouTube thumbnails and Reddit threads.
While multiple entertainment outlets have picked up the story, the original source remains unclear, making this firmly remain in rumor territory until Marvel makes an official announcement.
What the extended runtime could mean
If accurate, the nearly four-hour length would signal an absolutely massive narrative scope for the film.
Directed by returning maestros Anthony and Joe Russo, who previously delivered Infinity War and Endgame, the movie is bringing together an unprecedented ensemble cast including the original Avengers, the Fantastic Four, X-Men from the Fox era, and new MCU heroes.
Robert Downey Jr. returns to the franchise in a shocking twist, this time playing the iconic villain Doctor Doom instead of Tony Stark, while Chris Evans confirmed his comeback as Steve Rogers in the first teaser released December 23, 2025.
The extended runtime would allow breathing room for this sprawling cast while setting up the even bigger Avengers: Secret Wars, scheduled for December 17, 2027. Post-credit scenes are reportedly crucial, teasing what comes next in the multiverse saga.
The production behind the potential epic
Filming for Avengers: Doomsday took place primarily at Pinewood Studios in England between April and September 2025, with additional location shoots in Bahrain and Windsor Great Park. Alan Silvestri returns as composer after scoring Infinity War and Endgame, while Jeffrey Ford handles editing duties.
The production wrapped last September, with “healthy” amounts of reshoots expected in early 2026 according to The Hollywood Reporter.
Whether this runtime report proves true or not, one thing’s certain: Avengers: Doomsday is shaping up to be a genuine event film when it hits theaters on December 18, 2026.
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