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
Harlan Warde
as Treasury Agent Brooke
Shimen Ruskin
as Tailor
