Adam Driver Cast as Mister Sinister in MCU X-Men Film; Sadie Sink's Jean Grey Introduced as Antagonist

At D23 in Anaheim on August 14, 2026, Marvel confirmed Adam Driver as Mister Sinister in its untitled X-Men film, set for May 5, 2028. Sadie Sink's Jean Grey, who debuted as an antagonist in Spider-Man: Brand New Day, will anchor the film's narrative — the MCU's first introduction of mutants through adversarial roles rather than heroic ones.