Additional members of the Illuminati of Earth-838 include Patrick Stewart as Charles Xavier / Professor X, portraying a different version of the character that he previously played in 20th Century Fox's X-Men movie series; Hayley Atwell as Peggy Carter / Captain Carter, after voicing a similar version of the character in the animated series "What If...?" (2021); Lashana Lynch as Maria Rambeau / Captain Marvel, an alternate version of her character from "Captain Marvel" (2019); Anson Mount as Blackagar Boltagon / Black Bolt, an alternate version of his role from Marvel's ABC television series "Inhumans" (2017); and John Krasinski as Reed Richards / Mister Fantastic, a member of the Fantastic Four. Julian Hilliard and Jett Klyne portray the Earth-838 versions of their respective roles from "WandaVision" (2021) as Maximoff's sons Billy and Tommy, while Topo Wresniwiro reprises his role from the first movie as Hamir, a Master of the Mystic Arts. 