Oscar Isaac Hired His Brother to Help Him Play Dual Personalities in 'Moon Knight'
, Marvel Cinematic Universe’s latest spinoff about a superhero with dissociative identity disorder, Oscar Isaac plays two characters, Steven Grant and Marc Spector, who inhabit the same person. And over the course of the six-part series, Isaac is seen as both personalities, who often engage one another through mirrors or other reflective surfaces, especially when fighting for control over their body.