In 2019 Los Angeles, former policeman Rick Deckard is detained by officer Gaff, and brought to his former supervisor, Bryant. Deckard, whose job as a “blade runner” was to track down bioengineered humanoids known as replicants and “retire” (kill) them, is informed that four replicants are on Earth illegally. Deckard starts to leave, but Bryant ambiguously threatens him, and he stays. The two watch a video of a blade runner named Holden administering the Voight-Kampff test, which is designed to distinguish replicants from humans based on their emotional response to questions. The test subject, Leon, shoots Holden on the second question. Bryant wants Deckard to retire Leon and the other three Nexus-6 replicants: Roy Batty, Zhora, and Pris.