Paul Stevens as Doctor Allan Barnes

Claudette Nevins as Pam Albright

Anne Collings as Miss Goodrich

Bill Walker as Lieutenant Martin

Martin Lavut as Michael Radin

Leo Leyden as Doctor Soames

Norman Ettlinger as Professor Quincey

W.B. Brydon as Anderson (as Bill Bryden)

Jim Moran as Jim Moran

Eleanor Beecroft as Mrs. Kelly

Ray Lawlor as Lab Technician

Rudi Linschoten as Mime in Nightmare

Stephen Ker Appleby as Museum Guide (as Steven Appleby)

Alfie Scopp as

Paul Elsom as

Harry Blackstone as Self (in introduction added to video version) (uncredited)

Nancy Island as Girl Who Is Killed (uncredited)

Paul Nevens as Demon of the Mask (uncredited)