David Sheppard
Richard Egan
Joanna Merritt
Constance Dowling
Helen
Marian Richman
Marna
Jean Dean
Engle
William Schallert
Dr. Peter Burden
David Alpert
Senator
Tom Daly
Dr. Van Ness
Herbert Marshall
Dr. Zeitman
John Wengraf
Dr. Pierre Elzevir
Philip Van Zandt
Mme. Elzevir
Valerie Vernon
Dr. Carter
Byron Kane
Maj. Howard
Stephen Roberts
Dr. Hubertus
Michael Fox
Dr. Kirby
Aline Towne
Director
Herbert L. Strock
Screenplay
Tom Taggart
Art Direction
William Ferrari
Additional Dialogue
Richard G. Taylor
Editor
Set Decoration
Victor A. Gangelin
Director of Photography
Lothrop B. Worth
Story
Ivan Tors
Producer
Original Music Composer
Harry Sukman