Megalomaniac and would-be world dominator Roxor has kidnaped Robert Regent| along with his death ray invention| in hopes of using it to degenerate humanity intomindless brutes| leaving himself as Earth's supreme intelligence. Faced with revealing the machine's secrets or allowing his family to die a horrible death at thehands of Roxor| Regent's only hope lies with the intervention of his brother-in-law| the be-turbaned yogi and magician Chandu| who has the power to make men see whatis not there 'even unto a gathering of twelve times twelve'.