The iconic film that inspired a race to snap up Philip K. Dick's stories as source material, director Ridley Scott's 1982 film stars Harrison Ford as a retired Los Angeles detective in 2019 tasked with tracking down a quartet of Replicants -- perfect androids practically indistinguishable from humans -- who are illegally on Earth seeking to meet their maker and extend their expiration date. Based on Dick's 1968 novel Do Androids Dream of Electric Sheep.