Stuart Whitman
Dale Nelson / Arthur
Carol Lynley
Cynthia Lee Albright
Roddy McDowall
Martin Ashley
Lauren Bacall
Dr. Edwina Beighley
Olive Deering
Mrs. Mellon
Ossie Davis
Capshaw
Donald Buka
Psychologist
Paulene Myers
Dr. Walden (as Pauline Myers)
?
Evadne Baker
Intern
Robert J. Wilke
Technician Mike Newton (as Robert Wilke)