David Harewood is an English actor. He started his acting career in the early 1990s. During his beginnings, he had roles in the films The Hawk and Mad Dogs and Englishmen. He also appeared on the shows The Bill and Casualty. He then starred in the TV movies Harnessing Peacocks, Great Moments in Aviation, and Bermuda Grace. His first main role on the small screen was as Dr. Mike Gregson in Always and Everyone. He also became known for playing Sgt./D.I. Joe Robinson in The Vice. In the 2010s, he became known for his role as David Estes in Homeland. As of 2015, he plays J’onn J’onzz/Martian Manhunter / Hank Henshaw/Cyborg Superman in Supergirl.