A rogue scientist near a small desert town arouses the suspicion of the town's doctor when his lab assistant is found dead from a case of acromegaly, which took only four days to develop. As the doctor investigates, aided by the scientist's new female assistant, they discover that something is devouring local cattle and humans in increasingly large quantities.
In a nameless European city, a local reporter and his doctor wife try to escape from hordes of blood thirsty zombies, undead people exposed to nuclear radioactivity, while the military leaders fight a losing war of attrition against the relentless atomic zombies.