Spider-Man: Brand New Day holds a commanding lead in trader sentiment for 2026’s highest-grossing film, driven primarily by its July 31 release date that positions the entire domestic run within the calendar year under Polymarket’s resolution rules. This timing advantage outweighs the stronger franchise buzz around Avengers: Doomsday, which opens December 18 and can only accumulate roughly two weeks of 2026 grosses despite Robert Downey Jr.’s high-profile return and crossover appeal. The Super Mario Galaxy Movie and Toy Story 5 follow as mid-tier contenders, benefiting from proven animated franchises and earlier slots that allow fuller tracking, while later entries like Dune: Messiah and The Odyssey trail due to compressed windows and less certain audience momentum. Upcoming summer tracking reports and pre-sale data will likely refine these odds as release strategies solidify.