Richard Anderson

Dr. Paul Mallon

Elaine Edwards

Tina Enright

Adele Mara

Maria Fiorillo

Luis van Rooten

Dr. Carlo Fiorillo

Jan Arvan

Police Insp. Renaldi

Felix Locher

Dr. Emanuel

Gar Moore

Dr. Enricco Ricci

Bob Bryant

Quintillus Aurelius

Morris Ankrum

Narrator (unconfirmed)