Doctor Allan Barnes
Paul Stevens
Pam Albright
Claudette Nevins
Lab Technician
Ray Lawlor
Mime in Nightmare
Rudi Linschoten
Museum Guide (as Steven Appleby)
Stephen Ker Appleby
Alfie Scopp
Paul Elsom
Self (in introduction added to video version) (uncredited)
Harry Blackstone
Girl Who Is Killed (uncredited)
Nancy Island
Demon of the Mask (uncredited)
Paul Nevens
Miss Goodrich
Anne Collings
Lieutenant Martin
Bill Walker
Michael Radin
Martin Lavut
Doctor Soames
Leo Leyden
Professor Quincey
Norman Ettlinger
Anderson (as Bill Bryden)
W.B. Brydon
Jim Moran
Mrs. Kelly
Eleanor Beecroft
Director
Julian Roffman
Producer
Director of Photography
Herbert S. Alpert
Editor
Stephen Timar
Art Direction
David R. Ballou
Nat Taylor
Original Music Composer
Louis Applebaum
Screenplay
Franklin Delessert
Frank Taubes
Sandy Haver
Associate Producer
Assistant Art Director
Hugo Wuethrich
Conductor
Sound Recordist
Dick Vorisek
Yvonne Taylor
Production Manager
William S. Owens
Sound
Willard W. Goodman
Music
Myron Schaeffer
Choreographer
Don Gillies
Production Consultant
Jean S. Lenauer