Recent official announcements and promotional materials for Avengers: Doomsday have solidified a massive crossover featuring confirmed returns from the Avengers, Fantastic Four, and Fox-era X-Men, alongside Robert Downey Jr. as Doctor Doom, driving strong trader consensus on Polymarket for listed performers like Chris Evans, Chris Hemsworth, Pedro Pascal, and Ian McKellen. The Russos' direction and team-merging promos highlight multiversal stakes ahead of the December 18, 2026 release, boosting implied probabilities for core ensemble members while unconfirmed appearances—such as Tom Holland's Spider-Man or Benedict Cumberbatch's Doctor Strange—create volatility amid conflicting reports and teaser footage alterations. Upcoming marketing pushes, including potential trailer updates or SDCC follow-ups, could shift odds on surprise entries like Mark Ruffalo's Hulk before final cast locks.