One of the greatest movies of all-time.

Blade Runner is a 1982 American neo-noir science fiction film directed by Ridley Scott, and starring Harrison Ford, Rutger Hauer, Sean Young, and Edward James Olmos. The screenplay, written by Hampton Fancher and David Peoples, is a modified film adaptation of the 1968 novel Do Androids Dream of Electric Sheep? by Philip K. ♥♥♥♥.

The film depicts a dystopian Los Angeles in which genetically engineered replicants, which are visually indistinguishable from adult humans, are manufactured by the powerful Tyrell Corporation. The use of replicants on Earth is banned and they are exclusively utilized for dangerous or menial work on off-world colonies. Replicants who defy the ban and return to Earth are hunted down and killed ("retired") by special police operatives known as "Blade Runners". The plot focuses on a group of recently escaped replicants hiding in L.A. and the burnt-out expert Blade Runner, Rick Deckard (Harrison Ford), who reluctantly agrees to take on one more assignment to hunt them down.

http://www.warnerbros.com/blade-runner
IMDb Blade Runner page[www.imdb.com]
Off-World: The Fan-made Wiki[bladerunner.wikia.com]