Later (or possibly before) in Yucca Flats, Nevada, Soviet scientist Joseph Javorsky (Johnson) has defected from the USSR and arrives in America with a briefcase carrying various military secrets, including the Soviet moon landing. Javorsky and his American contacts are suddenly attacked by a pair of KGB assassins (Cardoza and John Morrison) killing Javorsky's contacts and bodyguards. Javorsky flees into the desert, walking for a great distance, and the searing heat causes him to discard much of his clothing. When he wanders in range of an American nuclear test, the bewildered Russian is transformed by it into a mindless beast with an uncontrollable urge to kill. He proceeds to murder a couple in their car on a nearby road, prompting pursuit from police officers Jim Archer (Stafford) and Joe Dobson (Aten).