Avengers: Doomsday to be the longest MCU movie at 3h45, rumor claims

Avengers: Doomsday, the highly anticipated next chapter of the Marvel Cinematic Universe (MCU), is about to make history for a surprising reason: its runtime. According to rumors from inside sources, the film opening on December 18, 2026 will be the longest in the entire franchise, with a projected runtime of an impressive 3 hours and 45 minutes. The production would thus break a record set seven years ago by Avengers: Endgame, which ran 3 hours and 1 minute.

By bringing back the Russo brothers to direct and turning Robert Downey Jr. into the villain Doctor Doom, Avengers: Doomsday will act as the first part of the finale of the Multiverse Saga. The blockbuster justifies its length, as it will need to balance a colossal cast, bringing together the Avengers, the New Avengers, the Fantastic Four and the X-Men in a single plot. As a result, the film faces the difficult mission of establishing a great new villain and connecting multiple realities, tasks that demand screen time.

A necessary risk for the future of the MCU?

However, such an extensive runtime does not come without risks. With trailers added, the theater experience could exceed 4 hours, limiting the number of daily screenings and potentially driving away the casual audience. That represents an extra challenge for the MCU, which, after a few recent stumbles, needs to win back fans’ trust with box-office success. Still, film history proves that audiences accept long runtimes when the content is captivating, as happened with The Lord of the Rings trilogy and Avatar: The Way of Water.

On the other hand, it is important to remember that the runtime information has not yet been officially confirmed by Marvel Studios. Filming is expected to go through reshoots in April, which could change the final cut. If the rumor proves true, the great advantage of Avengers: Doomsday will be using every minute wisely, with epic action and character development, so viewers do not feel the time pass. Otherwise, negative buzz could deal a harsh blow to the franchise at this crucial moment in 2026.