William Girdler Director, Screenwriter, Producer Tony Curtis Harry Erskine Actor Susan Strasberg Karen Tandy Actor Michael Ansara John Singing Rock Actor Stella Stevens Amelia Crusoe Actor Jon Cedar Dr. Jack Hughes Actor, Screenwriter Ann Sothern Mrs. Karmann Actor Burgess Meredith Dr. Snow Actor Paul Mantee Dr. McEvoy Actor Jeanette Nolan Mrs. Winconis Actor Lurene Tuttle Mrs. Herz Actor Ann Newman-Mantee 10th-Floor Nurse Actor Hugh Corcoran MacArthur Actor Carole Hemingway Neighbor Actor Thomas Pope Screenwriter David Sheldon Executive Producer Melvin G. Gordy Executive Producer Michel Hugo Cinematographer Bub Asman Film Editing Lalo Schifrin Original Music Walter Scott Herndon Production Design Cheryal Kearney Set Decoration