Richard Todd

Character: Charles Cameron/Charles Cameron Sutherland

André Morell

Character: Dr. "Willie" Marshall

Joan Greenwood

Character: Wilhelmina Cameron

Glynis Johns

Character: Katherine Manley

George Cole

Character: John Hannah

James Hayter

Character: Sir Douglas Manley

Ursula Howells

Character: Harriet Marshall

Freda Jackson

Character: Mrs. Hannah

Patrick Macnee

Character: Capt. David Sutherland

Michael Hordern

Character: Webster

Ronald Howard

Character: Purley

Muriel Aked

Character: Mrs Walker

Lily Kann

Character: Sister Maria

Molly Weir

Character: Margaret