Blade Runner is a 1982 American science fiction film, directed by Ridley Scott and starring Harrison Ford, Rutger Hauer, and Sean Young. The screenplay, written by Hampton Fancher and David Peoples, is loosely based on the novel Do Androids Dream of Electric Sheep? by Philip K. Dick. The film depicts a dystopian Los Angeles in November 2019 in which genetically manufactured beings called replicants – visually indistinguishable from adult humans – are used for dangerous or menial work on Earth's "off-world colonies". Following a replicant uprising, replicants become illegal on Earth and specialist police called "blade runners" are trained to hunt down and "retire" escaped replicants on Earth. The plot focuses on a brutal and cunning group of recently-escaped replicants hiding in Los Angeles and the semi-retired blade runner, Rick Deckard (Harrison Ford), who reluctantly agrees to take on one more assignment.