‘Supergirl’: Rhona Mitra To Play Mercy Graves On The CW Series, Robert Baker Also Cast

A new villain is rising in National City. Rhona Mitra has been tapped for a recurring role on the CW’s series Supergirl as Mercy Graves, Lex Luthor’s longtime bodyguard. Also cast in a recurring role on the DC series is Robert Baker, who will play Mercy’s brother, Otis Graves...