CREATURE WITH THE ATOM BRAIN

A hulking zombie breaks into a mansion and kills a gangster named Hennesy. The glowing bloodstains left behind at the crime scene are radioactive, as are the killer's fingerprints – which are of a man who had died days before. The police are baffled, but begin their investigation.

They soon discover that the connection between Hennesy and subsequent murders is Frank Buchanan, a former crime boss who had been deported to Europe. While there, Buchanan funded the research of German scientist Wilhelm Steigg to reanimate the dead. Having returned (with Steigg still beholden to him for funding) to the States, Buchanan seeks revenge on all who had sent him to prison in the first place.

The zombies, although they move fairly slowly, obey their radioed commands explicitly. They have no initiative, but can readily navigate the city and perform fairly complex tasks. They can drive, speak on behalf of Buchanan (including over the phone), are impervious to bullets, including those fired at point-blank range, and can bend steel bars and tear off steering wheels with ease. They also all have large scars visible on their foreheads from their brain surgery.

Following the fantastic yet irrefutable clues under the leadership of Chet Walker, both police and army troops eventually converge on Buchanan's mansion. Buchanan summarily kills Steigg and sends out a horde of zombies to battle them. Walker smashes the atomic-powered equipment which controls them, whereupon they all collapse, again inanimate corpses.

Police and army forces storm Buchanan's mansion. The atomic-powered equipment controlling the zombies is smashed, rendering the undead corpses inanimate.

The climax delivers a classic monster movie resolution: when the artificial control over life is broken, so too is the threat. The destruction of the equipment not only stops Buchanan's rampage, it reasserts the limits of mad science and restores order, with the zombies collapsing as lifeless bodies once more.