Arte

• Alfred Ybarra — art direction

Cámara

• William H. Clothier — director of photography

Dirección

• John Reinhardt — director
• William McGarry — assistant director

Producción

• John Reinhardt — producer
• Frank Parmenter — production manager
• Robert Presnell Sr. — producer

Reparto

• Gene Raymond — Steve Roark
• Sigrid Gurie — Linda Carlsen
• Patricia Morison — Magda Onescu
• Миша Ауэр — Ali Imagu
• John Wengraf — Peter Goltzen
• George Baxter — James Braden
• Charles Rooner — Dr. Stoyan
• Fernando Wagner — Dr. Erik Viertel
• Luz Alba — Ana Sokolova
• Egon Zappert — Marow--Sokolova's Henchman
• Hamil Petroff — Dmitri--Bell Captain
• Peter O'Crotty — Brother Johannes

Sonido

• Raúl Lavista — original music composer

Guion

• Frederick Stephani — writer