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Clark (George Reeves), Lois (Noel Neill) and Jimmy (Jack Larson) investigate a supposedly deserted island that is slated to be used as target practice by the US Navy. Unfortunately, the island isn't deserted at all, but instead is populated by the descendants of a 17th century pirate band. These latter-day buccaneers not only refuse to believe that they're in danger, but they also kidnap Clark, Lois and Jimmy and leave them tied up in the middle of the island! The pyrotechnic climax of this episode features the notorious scene in which a stock "flying" sequence is reversed, revealing a backward "S" on Superman's costume.