Peter Outerbridge (born June 30th, 1966) is a Canadian film and television actor best known for his role as Ari Tasarov in the CW action series Nikita, Dr. David Sandström in the TMN series ReGenesis, Henrik "Hank" Johanssen in Orphan Black, Bob Corbett in Bomb Girls, William Easton in Saw VI, George Brown in the television film John A.: Birth of a Country, and Black Mask in Batwoman. He also played the lead role of Detective William Murdoch in a three-episode mini-series, The Murdoch Mysteries, in its initial run on Canadian television, with two episodes shown in 2004 and a third in 2005.