Do Androids Dream of Electric Sheep? (retrospectively titled Blade Runner: Do Androids Dream of Electric Sheep? in some later printings) is a 1968 dystopian science fiction novel by American writer Philip K. Dick. It is set in a post-apocalyptic San Francisco, where Earth's life has been greatly damaged by a nuclear global war. The main plot follows Rick Deckard, a bounty hunter who has to "retire" (a euphemism for kill) six escaped Nexus-6 model androids, while a secondary plot follows John Isidore, a man of low IQ who aids the fugitive androids. The book served as the basis for the 1982 film Blade Runner and, even though some aspects of the novel were changed, many elements and themes from it were used in the film's 2017 sequel Blade Runner 2049.