"Avengers: Doomsday" is set to hit theaters on December 18, 2026, the same day as "Dune: Part Three," leading many to playfully dub the release date "Dunesday."

Marvel Studios President Kevin Feige recently addressed the scheduling conflict in an interview with Chinese media.
"One of the jobs of a filmmaker is to ensure that a great many people go to the cinema, so on the one hand, the thought of theaters worldwide potentially being packed that weekend is certainly exciting," Feige explained. "On the other hand, we couldn't complete the production of 'Avengers: Doomsday' in May, so it had to be moved to December."
Feige expressed his excitement that this film will finally bring together the Avengers, X-Men, Fantastic Four, and Doctor Doom, promising a "cosmic collision between your favorite characters from across various universes."

"In 'Avengers: Endgame,' everyone united to fight Thanos. In 'Avengers: Doomsday,' the stakes are even higher: three different universes, three different Earths, are truly colliding with each other," he elaborated. "Then the question arises: will these heroes fight each other to protect their own worlds, or can they find a way to cooperate and save all three? And how will Doctor Doom intervene?"
He also confirmed that the two upcoming films draw heavily from comic book lore. " 'Avengers: Doomsday' and 'Avengers: Secret Wars' are largely inspired by the Marvel Comics storylines 'Time Runs Out' and 'Secret Wars,' respectively. So—as is customary—the comics offer significant guidance for the films we're making."

Regarding Robert Downey Jr.'s return as Doctor Doom, Feige emphasized, "We didn't want to simply bring Tony Stark back. The ending of 'Avengers: Endgame' is one of our proudest moments, seeing the global audience's reaction to Tony's sacrifice. So we didn't want him to just 'magically' return, but in Marvel, actors have many opportunities to return in entirely new ways."
"When we were casting for Doctor Doom, we said: we need to find the greatest actor in the world, because Doctor Doom is one of the most interesting characters. He's brilliant, incredibly intelligent; he can be a villain, but he also believes he's a hero. We watched 'Oppenheimer'—and he won an Oscar for it—and finally, we realized."
"How great, bold, and adventurous would it be to bring back our most iconic hero to play our most iconic villain. Thankfully, he said yes," Feige concluded.