Richard Anderson

Character: Dr. Paul Mallon

Elaine Edwards

Character: Tina Enright

Adele Mara

Character: Maria Fiorillo

Luis van Rooten

Character: Dr. Carlo Fiorillo

Jan Arvan

Character: Police Insp. Renaldi

Felix Locher

Character: Dr. Emanuel

Gar Moore

Character: Dr. Enricco Ricci

Bob Bryant

Character: Quintillus Aurelius

Morris Ankrum

Character: Narrator (unconfirmed)

George Sawaya

Character: Tony

Rudy Germane

Character: Police Officer (uncredited)

Jack Kenney

Character: Police Officer (uncredited)

George Sawaya

Character: Tony (uncredited)

Stephen Soldi

Character: Workman (uncredited)