Blade Runner is a 1982-year movie depicting a gloomy Los Angeles of 2019 where the replicants or genetically engineered robots that are indistinguishable from humans who are produced by Tyrell Corporation have the purpose of holding control over various off-world colonies. A blade runner is the main character of the movie. His name is Rick Deckard, and he is a former policeman whose job was to find and destroy replicants that caused harm to people or malfunctioned.
The dramatic premise of the movie is Deckard being called out of retirement with the sole task to pursue and eliminate four replicants who have committed a mutiny on one of the off-world colonies by capturing and stealing a spaceship in order to return to Earth and find their creator. Although Deckard does not have any job, he does not want to return to work in the blade runner unit. However, he is blackmailed by Bryant, his former police colleague, and must choose between two options, namely either being constantly prosecuted by the police or eliminating the escaped replicants. Thus, Deckard reluctantly accepts the offer to kill the replicants.
As for Deckard’s dramatic need, it changes as the story progresses. First, he simply wants to complete his task as fast as possible and return to his life breaking all the former connections. Then, Deckard meets Rachael who is an assistant of Tyrell, a founder of the corporation that produces replicants. Rachael is a replicant too, but she does not know it. Then, Deckard finds out that Rachael is a unique replicant who is given the possibility to live much more than other replicants. After Rachael saves Deckard’s life and they sleep together, he begins to reconsider his thoughts about all replicants in general and her in particular.
He begins to sympathize with them, which makes killing them far more difficult. Thus, his need changes, and his new goal is still to eliminate the rest of the escaped replicants, as they have killed many people, and save Rachael, as she also has to be eliminated. In the end, Deckard manages to fulfill his dramatic need by destroying the replicants and escaping with Rachael, so that nobody could find them.