Recent official Marvel cast announcements and promotional materials have solidified a massive multiverse crossover in Avengers: Doomsday, driving strong trader consensus around confirmed appearances from multiple factions. Heroes from Earth-616 (including Thor, Sam Wilson’s Captain America, Loki, Shang-Chi, and Wakandans like Shuri), the Fantastic Four from Earth-828, and Fox-era X-Men characters such as Professor X, Magneto, and Gambit headline the ensemble, bolstered by Robert Downey Jr. as Doctor Doom. Recent World Series teasers and San Diego Comic-Con panels highlighted team dynamics and returns like Chris Evans’ Steve Rogers and Hayley Atwell’s Peggy Carter, while directors have teased additional secret cameos. With the December 18 release approaching, final trailer drops and any last-minute guild or studio updates could shift probabilities for unconfirmed roles like the Hulk.