"Shortly after moving into a dark, brooding mansion, a psychologist and his co-workers are terrorized by a horrible evil being."
Richard Crenna
as C.J. Arnold
Joanna Pettet
as Dr. Caroline Arnold
Andrew Prine
as Prof. Raymond Guy
Cassie Yates
as Mary Harper
George O'Hanlon, Jr.
as Pete Brooks
Lynne Moody
as Felicia Allen
Mary Louise Weller
as Laurie Belman
Robert Viharo
as Dwight
Victor Buono
as The Devil
Milton Selzer
as The Realtor
Ed Bakey
as Sam the Caretaker
Galen Thompson
as Emilio Vargas
Emory Souza
as The Demon
Gus Trikonis
Director
David Sheldon
Screenstory
Barbara Andrews
Wardrobe Coordinator
Gordon Davidson
Sound Effects Editor
Scott U. Adam
First Assistant Director
Buddy Joe Hooker
Stunts
Co-Producer
Dan Steinbrocker
Second Assistant Director
Robert R. Rutledge
James Alvarez
Wardrobe Assistant
John Fresco
Music Supervisor
Michael Bennett
Property Master
Elizabeth Gallagher
Script Supervisor
Earl Sampson
Boom Operator
Harry Caplan
Production Manager
William B. Kaplan
Sound Mixer
Jack H. Young
Prosthetic Makeup Artist
Jerry Cohen
Music Editor
Johnny Harris
Original Music Composer
Jack Kirschner
Editor
Peter Jamison
Art Direction
Malcolm Levinthal
Executive Producer
Mario DiLeo
Director of Photography
Screenplay
Paul Joseph
Lynne Brooks
Makeup Artist
Roger Corman
Robert W. Sheets
Set Decoration
Ed Carlin
Producer