Trader sentiment strongly favors Avengers: Doomsday as the likely leader for the biggest 2026 opening weekend, driven by the franchise's proven track record of massive debuts and sustained MCU momentum following recent phase developments. With a 72.5% implied probability, the market reflects broad trader consensus on the Avengers brand's ability to generate unparalleled pre-release buzz compared to other superhero entries. Spider-Man: Brand New Day sits at 15.5% on the strength of its established fanbase and sequel appeal, though it trails notably behind the top contender. Lower probabilities for Toy Story 5 at 3.1%, Dune: Messiah at 1.8%, and titles like Star Wars: The Mandalorian and Grogu at 0.9% highlight the market's emphasis on event-level superhero spectacles over animated or sci-fi sequels. Trailer drops and marketing campaigns in the coming months remain key swing factors for these positions.