Paul Stevens

Doctor Allan Barnes

Claudette Nevins

Pam Albright

Anne Collings

Miss Goodrich

Bill Walker

Lieutenant Martin

Martin Lavut

Michael Radin

Leo Leyden

Doctor Soames

Leo Leyden

Doctor Soames

Norman Ettlinger

Professor Quincey

W.B. Brydon

Anderson (as Bill Bryden)

Jim Moran

Jim Moran

Eleanor Beecroft

Mrs. Kelly

Ray Lawlor

Lab Technician

Rudi Linschoten

Mime in Nightmare

Stephen Ker Appleby

Museum Guide (as Steven Appleby)

Alfie Scopp

Paul Elsom

Harry Blackstone

Self (in introduction added to video version) (uncredited)

Nancy Island

Girl Who Is Killed (uncredited)

Paul Nevens

Demon of the Mask (uncredited)