On screen
Cast
18 credited performers
Paul Stevens
Doctor Allan Barnes
Claudette Nevins
Pam Albright
Anne Collings
Miss Goodrich
Artwork unavailable
Bill Walker
Lieutenant Martin
Martin Lavut
Michael Radin
Leo Leyden
Doctor Soames
Artwork unavailable
Norman Ettlinger
Professor Quincey
Artwork unavailable
W.B. Brydon
Anderson (as Bill Bryden)
Artwork unavailable
Jim Moran
Jim Moran
Artwork unavailable
Eleanor Beecroft
Mrs. Kelly
Artwork unavailable
Ray Lawlor
Lab Technician
Artwork unavailable
Rudi Linschoten
Mime in Nightmare
Artwork unavailable
Stephen Ker Appleby
Museum Guide (as Steven Appleby)
Artwork unavailable
Alfie Scopp
Character not listed
Artwork unavailable
Paul Elsom
Character not listed
Artwork unavailable
Harry Blackstone
Self (in introduction added to video version) (uncredited)
Artwork unavailable
Nancy Island
Girl Who Is Killed (uncredited)
Artwork unavailable
Paul Nevens
Demon of the Mask (uncredited)