<p>It's an explosive adventure for the Man of Steel as he tries to thwart a plot by foreign spies. This adventure originally aired between April 21 and May 9, 1941. </p>

It's an explosive adventure for the Man of Steel as he tries to thwart a plot by foreign spies. This adventure originally aired between April 21 and May 9, 1941.

BONUS - Superman Summer: The Nitrate Shipment

Presenting the best detectives from the Golden Age of Radio.  Each week, we'll bring you an episode starring one of Old Time Radio's greatest detectives and the story behind the show.  Join us for adventures of Philip Marlowe, Sam Spade, Johnny Dollar, and many more.

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Presenting the best detectives from the Golden Age of Radio. Each week, we'll bring you an episode starring one of Old Time Radio's greatest detectives and the story behind the show. Join us for adventures of Philip Marlowe, Sam Spade, Johnny Dollar, and many more.

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BONUS - Superman Summer: The Nitrate Shipment

BONUS - Superman Summer: The Nitrate Shipment

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