Avengers: Doomsday is an upcoming superhero blockbuster scheduled for theatrical release on December 18, 2026, serving as the 39th film in the Marvel Cinematic Universe (MCU). Directed by the returning Russo brothers, the plot follows beloved heroes from three distinct universes—including the Avengers, the Fantastic Four, and the X-Men—as their realities crash together on a deadly multiversal collision course. To prevent total extinction, these forces must forge unexpected alliances to confront the ultimate existential threat: the iconic villain Victor von Doom, portrayed by a returning Robert Downey Jr.