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.

Directed by: Douglas Sirk
Written by: George F. Slavin
Runtime: 78 minutes
Tagline: Undersea Raider at Large!
Cast:
Macdonald Carey Macdonald Carey
Brett Young 
Märta Torén Märta Torén
Madeline Brenner (as Marta Toren) 
Robert Douglas Robert Douglas
Commander von Molter 
Carl Esmond Carl Esmond
Heldman 
Ludwig Donath Ludwig Donath
Dr. Adolph Guernitz 
Jacqueline Dalya Jacqueline Dalya
Carla (as Jacqueline Dalya Hilliard)