Posing as an ex-German medical officer, a U. S. Navy Intelligence Officer sets out to rescue a kidnapped scientist, and sink a Nazi submarine, hiding off the coast of South America.
Macdonald Carey
as Brett Young
Märta Torén
as Madeline Brenner (as Marta Toren)
Robert Douglas
as Commander von Molter
Carl Esmond
as Heldman
Ludwig Donath
as Dr. Adolph Guernitz
Jacqueline Dalya
as Carla (as Jacqueline Dalya Hilliard)
Fred Nurney
as Bruno
Katherine Warren
as Mrs. Weber (as Katharine Warren)
Howard Negley
as Captain Elliott
Bruce Morgan
as Kramer
Ralph Brooks
as Stefan (as Ralph Brooke)
Paul Hoffman
as Hartwig
