Leon Linden is the main antagonist of the 1988 horror movie, Pin and also a young man displaying traits associated with schizophrenia as well as those of disassociative personality disorder. He is portrayed by British-born Canadian actor, writer, director and voice actor David Hewlett who is best known for his role as Dr. Rodney McKay on the American-Canadian sci-fi series, Stargate SG-1, Stargate Atlantis and Stargate Universe.