In 1982 Ridley Scott directed Blade Runner, a science – fiction – noir film starring Harrison Ford, Rutger Hauer, Sean Young and Daryl Hannah. It is loosely (lontanamente) based on the novel Do Androids Dream of Electric Sheep? by Philip K. Dick. The story follows Rick Deckard, a retired cop (poliziotto in pensione) in Los Angeles around the year 2019. The city is now a sort of cultural dystopia full of advertising (pubblicità), pollution (inquinamento), flying automobiles, replicants, and androids. Both replicants and androids are built by the Tyrell Corporation to colonize other planets. Deckard was a blade runner, that is to say a detective that captures evil replicants and is called back to hunt (dare la caccia) four replicants led by Roy Batty. They have escaped and are killing human beings. First he meets Eldon Tyrel, creator of the replicants, then starts his duty (dovere). While in mission, Deckard is almost killed, but is saved by Rachael Tyrell’s assistant. She is a replicant, but she does not know her nature. Meanwhile Batty and his replicant lover, Pris, force a dying inventor, J.F. Sebastian, to help them get close (avvicinarsi) to Tyrell and murder him (ucciderlo). Deckard finds the couple and struggle (combatte) with Batty on a skyscraper rooftop (tetto di un grattacielo) high above the city. In 1992, Ridley Scott removed (tolse) Deckard’s narration, added (aggiunse) a dream sequence, and eliminated the happy ending.