The inventor of a new energy-transmitting machine is held captive on an uncharted island by a criminal whose "transformation chair" turns him into a double of his buccaneer ancestor. A criminologist helps the scientist's daughter search for her father, encountering one deathtrap after another. Republic serial stars Richard Bailey, Linda Stirling, and Roy Barcroft as the pirate Captain Mephisto. 15 swashbuckling episodes; 3 2/3 hrs. Standard; Soundtrack: English Dolby Digital stereo.