Harry Joseph Lennix III[ (born November 16, 1964) is an American actor. He is best known for his roles as Terrence "Dresser" Williams in the Robert Townsend film The Five Heartbeats (1991) and as Boyd Langton in the science-fiction series Dollhouse. Lennix currently co-stars as Harold Cooper, Assistant Director of the FBI Counterterrorism Division, on the NBC drama The Blacklist. Lennix played General and then Secretary of Defense Calvin Swanwick / J'onn J'onzz / Martian Manhunter in the DC Extended Universe.