Sealed Cargo is a 1951 American war film about a fisherman, played by Dana Andrews, who gets tangled up with Nazis and their U-boats.

Andrews' younger brother, actor Steve Forrest, had a small, uncredited part, one of his earliest screen roles.

In 1943, at the height of the World War II Battle of the Atlantic, Captain Pat Banyon, skipper of the fishing trawler Daniel Webster, unloads his catch in his home port of Gloucester, Massachusetts.

Shorthanded, he hires Danish sailor Konrad, and the Daniel Webster sails for the Grand Banks fishing grounds.

As Banyon knows all the crew well except for Konrad and fellow Dane Holger, he suspects one of them or even Margaret of being a German agent.

Banyon offers to leave one of his two Danish crewmen as a witness, allowing him to rid himself of the spy Holger without arousing suspicion.

In the resulting confusion, they board, overpower or kill the remainder of the crew, and free Margaret, who had been taken as a hostage.