Adam Driver Cast as Nathaniel Milbury (Mister Sinister) in Marvel Studios' Upcoming X-Men Film

Actor Adam Driver has been cast as Nathaniel Milbury, widely identified as the villain Mister Sinister, in Marvel Studios' forthcoming X-Men film. The announcement was made during Disney's D23 2026 entertainment showcase. Driver joins a cast that includes Sadie Sink as Jean Grey and Kit Connor as Scott Summers, with the film slated for a May 2028 release.