Richard Anderson as Dr. Paul Mallon

Elaine Edwards as Tina Enright

Adele Mara as Maria Fiorillo

Luis van Rooten as Dr. Carlo Fiorillo

Jan Arvan as Police Insp. Renaldi

Felix Locher as Dr. Emanuel

Gar Moore as Dr. Enricco Ricci

Bob Bryant as Quintillus Aurelius

Morris Ankrum as Narrator (unconfirmed)

George Sawaya as Tony

Rudy Germane as Police Officer (uncredited)

Jack Kenney as Police Officer (uncredited)

George Sawaya as Tony (uncredited)

Stephen Soldi as Workman (uncredited)