Recent casting announcements and multiverse crossover marketing have shaped trader sentiment around character inclusions in Avengers: Doomsday. Marvel revealed an expansive lineup in 2025, including Robert Downey Jr. as Doctor Doom, Chris Evans reprising Steve Rogers, the full Fantastic Four cast, Fox-era X-Men actors such as Patrick Stewart and Ian McKellen, and Thunderbolts members like Florence Pugh and Sebastian Stan. Directors Joe and Anthony Russo have teased additional surprises, notably leaving Mark Ruffalo’s Hulk involvement unconfirmed despite narrative ties, while D23 2026 footage and recent trailers highlighted crossovers without resolving rumored returns like Hugh Jackman’s Wolverine or Ryan Reynolds’ Deadpool. With the December 18 release approaching, ongoing promotional updates and precursor events like potential trailer drops will likely influence probabilities for unannounced appearances amid the film’s focus on confirmed MCU veterans and multiversal heroes.