
Benjamin "Ben" Lockwood, also known as Agent Liberty, is the main antagonist (or one of) of the fourth season of Supergirl. He is the leader of the Children of Liberty, a vastly growing anti-alien extremist organization bent on sabotaging the Alien Amnesty Act and ridding every alien in America. He is portrayed by Sam Witwer, who previously portrayed Jason Teague/Doomsday in Smallville.