- Cary Grant as T. R. Devlin
- Ingrid Bergman as Alicia Huberman
- Claude Rains as Alexander Sebastian
- Leopoldine Konstantin as Madame Anna Sebastian
- Louis Calhern as Captain Paul Prescott, an officer of the U.S. Secret Service
- Reinhold Schünzel as Dr. Anderson, a Nazi conspirator
- Moroni Olsen as Walter Beardsley, another Secret Service officer
- Ivan Triesault as Eric Mathis, a Nazi conspirator
- Alexis Minotis as Joseph, Sebastian's butler (billed as Alex Minotis)
- Wally Brown as Mr. Hopkins
- Sir Charles Mendl as Commodore
- Ricardo Costa as Dr. Julio Barbosa
- Eberhard Krumschmidt as Emil Hupka, a Nazi conspirator
- Fay Baker as Ethel
- Bea Benaderet as File Clerk (uncredited)
- Peter von Zerneck as Wilhelm Rossner, a Nazi conspirator (uncredited)
- Friedrich von Ledebur as Knerr, a Nazi conspirator (uncredited)
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