Dr Patrick Cory is a scientist who, unable to save W.H. Donovan's life after a plane crash, keeps his brain alive thru an illegal experiment. The story provides an examination of evil impossible to forget. Donovan is more than one of the world's richest men. He's a megalomaniac even before Cory keeps his brain alive in the tank. Once freed of the distractions of flesh, the will to power is all that drives him. It communicates with Cory thru telepathy, but that's only the beginning. It begins to take over the scientist. Possessed by Donovan's mind, Cory finds himself helpless to fight the tycoon's plans. Cory remains aware as he follows orders, becoming more & more like Donovan. His wife is helpless, his assistant is helpless, to stop Donovan's Brain!