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)