Lon Chaney Jr.
Alex Gregor, aka Gregor the Great
Tala Birell
Mme. Monet
Arthur Hohl
The Drunk in the Audience
Martin Kosleck
Rudi
Evelyn Ankers
Maura Daniel
Leyland Hodgson
Doctor in audience (uncredited)
Dennis Moore
Radio Announcer (uncredited)
Douglass Dumbrille
Inspector Brant
Milburn Stone
George Keene
Elena Verdugo
Nina Coudreau