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Six enemy agents, all under the surveillance of Greek spy Zarkas (Harold J. Stone), have disappeared without a trace. To find out why, American agents Kelly and Scotty set a cleverly baited trap. Though this episode was largely filmed in Greece, the underwater sequences were lensed at Silver Spring, Florida, the site of many a "Tarzan" movie and Sea Hunt episode. Written by Berkley Mather, "The Seventh Captain" first aired on November 13, 1967.