"Blade Runner" is a cyberpunk masterpiece that's at once a gritty, sci-fi crime drama and an exploration of what it means to be human. Harrison Ford stars as Rick Deckard, a jaded ex-police officer who is hired to deactivate replicants who are living on Earth illegally. These replicants look like humans, but they're robots with a limited amount of time to live. Despite being built rather than born, the replicants possess human attributes and memories — and in at least one case, they sometimes have no idea that they're replicants. This complicates Rick's job as he begins to question whether or not he's doing the right thing by deactivating the replicants.