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