Blade Runner is a 1982 American neo-noir science fiction film directed by Ridley Scott, written by Hampton Fancher and David Peoples, and starring Harrison Ford, Rutger Hauer, Sean Young, and Edward James Olmos. It is a loose adaptation of the 1968 novel Do Androids Dream of Electric Sheep? by Philip K. Dick. The film is set in a dystopian Los Angeles in 2019, and depicts a future in which synthetic humans known as replicants are bioengineered by the powerful Tyrell Corporation to work on off-world colonies. When a fugitive group of replicants led by Roy Batty (Hauer) escape back to Earth, burnt-out cop Rick Deckard (Ford) reluctantly agrees to hunt them down. During his investigations, Deckard meets Rachael (Young), an advanced replicant who causes him to question his work.

Science fiction (often shortened to SF or sci-fi) is a genre of speculative fiction, typically dealing with imaginative concepts such as futuristic science and technology, space travel, time travel, faster than light travel, parallel universes, and extraterrestrial life. Science fiction often explores the potential consequences of scientific and other innovations, and has been called a "literature of ideas". It usually avoids the supernatural, and unlike the related genre of fantasy, historically, science-fiction stories were intended to have a grounding in science-based fact or theory at the time the story was created, but this connection is now limited to hard science fiction.