John Cardos Director, Producer William Devane Roy Warner, Steve Dupree Actor Cathy Lee Crosby Zoe Owens Actor Richard Jaeckel Detective Dave Mooney Actor Keenan Wynn Sherman Moss Actor Warren J. Kemmerling Police Captain Speer Actor Biff Elliot Detective Jack Bresler Actor Jacquelyn Hyde DeRenzy Actor Casey Kasem Police Pathologist Actor Vivian Blaine Courtney Floyd Actor John Bloom The Dark Actor William Derringer Herman Burmeister Actor Jay Lawrence Jim Hampton Actor Russ Marin Dr. Baranoski Actor Roberto Contreras Max Actor Stanford Whitmore Writer Dick Clark Producer Roger Kellaway Original Music Fred Goodich Cinematographer Martin Dreffke Film Editing Marvin Paige Casting Rusty Lipscomb Production Design William Strom Set Decoration Ve Neill Makeup Irwin Cadden Sound Robbie Knott Special Effects Peter Kuran Visual Effects Bobby Clark Stunts