- Eleanor Beecroft - Mrs. Kelly
- Ray Lawlor - Lab Technician
- Rudi Linschoten - Mime in Nightmare
- Stephen Ker Appleby - Museum Guide (as Steven Appleby)
- Harry Blackstone - Self (in introduction added to video version) (uncredited)
- Nancy Island - Girl Who Is Killed (uncredited)
- Paul Nevens - Demon of the Mask (uncredited)
-
Howard Hawks
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