The narrative tension is fueled by their forced cooperation as they serve as the "avatar" for Khonshu, the ancient Egyptian moon god. This divine bond grants them superhuman abilities, manifesting in the sleek, bandage-like Moon Knight suit for Marc and the "Mr. Knight" three-piece suit for Steven. Moon Knight (TV Mini Series 2022) - IMDb
At its core, Moon Knight is a character study of Marc Spector and Steven Grant (both played by Oscar Isaac), two identities sharing a body due to Dissociative Identity Disorder (DID). The story begins through the eyes of Steven, a mild-mannered museum gift-shop employee in London who is plagued by mysterious blackouts. He soon discovers that during these lapses, Marc—a hardened American mercenary—takes control.