Plot

Mandrake and Luthor are working the cruise lines and meet Professor Hudson who has developed a radium energy machine, which is much coveted by "The Wasp", who sends his hordes of henchmen in waves to steal the invention, and they blow up a radio station, a power plant and a dam, just to show they mean business.

    Cast

     Warren Hull as Mandrake the Magician
    Doris Weston as Betty Houston
    Al Kikume as Lothar, Mandrake's Assistant
    Rex Downing as Tommy Houston
    Edward Earle as Doctor Andre Bennett
    Forbes Murray as Professor Houston
    Kenneth MacDonald as James Webster
    Don Beddoe as Frank Raymond
    Dick Curtis as Dorgan, a henchman
    John Tyrrell as Dirk, the "spearpoint heavy" (chief henchman)
     ?? as The Wasp

    Chapter titles

     Shadow on the Wall
    Trap of the Wasp
    City of Terror
    The Secret Passage
    The Devil's Playmate
    The Fatal Crash
    Gamble for Life
    Across the Deadline
    Terror Rides the Rails
    The Unseen Monster
    At the Stroke of Eight
    The Reward of Treachery