Rhona Mitra (The Last Ship, The Strain) has been cast in a season-long recurring role in the upcoming third season of Supergirl per Deadline's exclusive. Mitra will play Mercy Graves, Lex Luthor's longtime bodyguard. Also, Robert Baker (Grey's Anatomy, Riverdale) is joining the cast in a recurring role as Otis Graves, Mercy's brother.
Based on the iconic DC character, Mercy Graves (Mitra) is an ex-CADMUS agent who has always believed in human exceptionalism. But with both Lex and Lillian in prison, Mercy is stepping out of the Luthor shadow and running her own show. With her biting wit and lethal brawn, Mercy steadily becomes a key figure in National City’s growing “human-first” movement.
Baker’s Otis Graves is Mercy’s de facto right-hand man. What he lacks in brains, he makes up for with his savant-like abilities to assassinate aliens. Otis is a character from the Superman movies with Christopher Reeve and has not been featured in comic books.
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