Gus Trikonis Director, Screenwriter Richard Crenna C.J. Arnold Actor Joanna Pettet Dr. Caroline Arnold Actor Andrew Prine Prof. Raymond Guy Actor Cassie Yates Mary Harper Actor Lynne Moody Felicia Allen Actor Victor Buono The Devil Actor George O'Hanlon Jr. Pete Brooks Actor Mary Louise Weller Laurie Belman Actor Robert Viharo Dwight Actor Milton Selzer The Realtor Actor Galen Thompson Emilio Vargas Actor, Screenwriter Ed Carlin Producer Roger Corman Executive Producer Paul A. Joseph Executive Producer Malcolm Levinthal Executive Producer Mario Di Leo Cinematographer Jack Kirschner Film Editing Johnny Harris Original Music Robert W. Sheets Set Decoration Peter Jamison Art Director