Peter Francis James

as Mason

as Archie Gaines (4 episodes)

as Headmaster Warren (1 episode)

as Dr. Baum

as Henry Lyppiatt

as Bobby O'Neill (2 episodes)

as Jack Eason

as Clyde Rutledge (1 episode)

as Dr. Aldus Boardman (2 episodes)

as Franklin Burnett (1 episode)

as Colin Parker

as Kent

as Titus Bosch (1 episode)

as Neurosurgeon

as Dr. Aldus Boardman (1 episode)

as Marc Forrest

as Fadhil

as Dr. Grosso

as Doctor

as Mackintosh (1 episode)

as Lieutenant General (1 episode)

as James Wolf (1 episode)

as Raymond Parks

as Mr. Richmond (1 episode)

as Alfred Livingston