Upon their defeat by Francis Drake, a ship's crew which served in the Spanish Armada anchors near a small coastal village in England to make repairs on their vessel. While there, the cuthroat Captain Robeles (Christopher Lee) leads his men to take control of the town in an opportunistic move, claiming to have won a naval battle. Fortunately for the villagers, they are not without means defending themselves -- especially as one crewman decides to jump ship to help them. Screenwriter Jimmy Sangster, known mostly for his horror tales, contributed yet another character for Lee as he did previously in Curse of Frankenstein, Horror of Dracula, The Mummy, and Scream of Fear.