Mitra is best known for her work on Cinemax’s Strike Back, TNT’s The Last Ship and for her recurring role on the final season of FX’s The Strain.
Though Graves initially debuted on Superman: The Animated Series in 1996, she made her comic debut the same year, whereas Otis only appeared in the Christopher Reeves films.
New to the cast for the fourth season is Sam Witwer as hero Agent Liberty.
Baker is most notable for his roles in ABC’s Grey’s Anatomy and Netflix’s Santa Clarita Diet.