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Mystery Submarine   1950         N/R, 78 min. Genre: Drama Director: Douglas Sirk   Cast: Macdonald Carey, Marta Toren, Robert Douglas, Carl Esmond, Ludwig Donath, Jacqueline Dalya, Fred Nurney, Katherine Warren, Howard Negley, Bruce Morgan   Brett Young (Macdonald Carey) is an undercover agent with the job of keeping U.S. atomic secrets from falling into the wrong hands. The mysterious Madelein Brenner (Marta Toren) and a renegade submarine that is after atomic secrets become Young's challenge. Weak.