Herbert L. Strock Director, Film Editing Richard Egan Dr. David Sheppard Actor Constance Dowling Joanna Merritt Actor Herbert Marshall Dr. Van Ness Actor John Wengraf Dr. Zeitman Actor Philip Van Zandt Dr. Pierre Elzevir Actor Valerie Vernon Mme. Elzevir Actor, Costume Design Stephen Roberts Maj. Howard Actor Byron Kane Dr. Carter Actor William Schallert Engle Actor Marian Richman Helen Actor Tom Taggart Screenwriter Ivan Tors Producer Lothrop B. Worth Cinematographer Harry Sukman Original Music William Ferrari Art Director Victor A. Gangelin Set Decoration