A scientist takes the brain of dead man and revives it via electrodes as it lays suspended in a tank of liquid. Soon, the brain grows to possess enormous psychic powers and inflicts its personality upon the doctor who saved it, creating a "Jekyll and Hyde" paradigm.

Lew Ayres
as Dr. Patrick J. Cory

Nancy Reagan
as Janice Cory

Gene Evans
as Dr. Frank Schratt

Steve Brodie
as Herbie Yocum

Tom Powers
as Donovan's Washington Advisor

Lisa Howard
as Chloe Donovan

James Anderson
as Chief Tuttle

Victor Sutherland
as Nathaniel Fuller

Michael Colgan
as Tom Donovan

Peter Adams
as Mr. Webster