Otto Kruger
Dr. Stendahl
Vicky Lane
Paula Dupree - the Ape Woman
Amelita Ward
Ann Forrester
Phil Brown
Don Young
Jerome Cowan
Detective W.L. Harrigan
Rondo Hatton
Moloch the Brute
Eddie Acuff
Bill
Ernie Adams
Jim
Charles Wagenheim
Fred
Eddy Chandler
Motorcycle Cop
Jack Overman
Detective - George
Pat Gleason
Tom - Second Morgue Attendant (uncredited)
William Murphy
Johnny - Errand Boy (uncredited)
Bob Pepper
Policeman at Morgue (uncredited)