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Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.
Character :Lance Reardon
Character :Claire Forrest
Character :Capt. Mephisto
Character :Sidney Brand
Character :Prof. William Forrest
Character :Prof. Harry Hargraves
Character :Edward Armstrong
Character :Frederick "Fred" Braley
Character :Paul Melton
Character :John Raymond
Character :Police Insp. Reed
Character :Ruga
Character :Barker / Ritter / Lewis / Frazier / Sardon
Character :Lyons / Bailey
Character :Spencer Harvey
