TMDb/Avengers: Endgame Movie Avengers: Endgame returns to theaters in 2026 with new footage setting up Avengers: Doomsday. A controversial move amid Marvel's box office struggles. April 29, 2026 AceShowbiz - Avengers: Endgame is set for a theatrical re-release in September 2026, featuring new footage that ties directly into the upcoming Avengers: Doomsday, marking a controversial move by Marvel Studios. This decision comes amid growing concerns about the studio's recent box office struggles and criticism over the sprawling Multiversal Saga, which has been in development since 2021.