Characters played by Richard Basehart
Reggie Wilson
Characters played by Mary Murphy
Evelyn Stewart
Characters played by Constance Cummings
Kay Wallace
Characters played by Roger Livesey
Ben Case
Characters played by Faith Brook
Lesley Wilson
Characters played by Mervyn Johns
Ernest Chaple
Characters played by Vernon Greeves
George Mearns
Characters played by André Mikhelson
Steve Vadney
Characters played by David Lodge
Police Sgt. Brown
Characters played by Basil Dignam
Dr. Gray
Characters played by Grace Denbeigh-Russell
Mrs. Lynton