Richard Harris
— John Carter
Ann Turkel
— Susan Beresford
Gordon Jackson
— Dr. Marston
John Vernon
— Luis Carreras
David Janssen
— Charles Conway
Burgess Meredith
— Van Heurden
Leigh Lawson
— Tony Cerdan
Robert Flemyng
— Capt. Bullen
Keith Baxter
— Preston
Robert Beatty
— Dr. Taubman
Dorothy Malone
— Mrs. Skinner
John Carradine
— Fairweather
Richard Cox
— Browning
Michael Howard
— Benson
Christopher Chittell
— Rogers