For years, the whereabouts of Dr. Leon Kravaal (Boris Karloff) -- a scientist who'd been looking into the power of cryogenics -- were a mystery. Written off for dead, the doctor is eventually discovered frozen in ice and is subsequently thawed out by two curious colleagues (Roger Pryor and Jo Ann Sayers). Dying to get back to his life's work, Kravaal decides to use the unlucky duo for his experiments, but they're not having any of it.