Blade Runner is a 1982 science fiction film directed by Ridley Scott, starring Harrison Ford. It is set in a dystopian future of 2019 where human-like replicants have been created by the Tyrell Corporation to work on off-world colonies. Replicants are considered dangerous by humans if they disobey or live longer than their predetermined lifespan of 4 years. Special police officers called "Blade Runners" hunt down replicants that escape. The film questions what it means to be human when the distinction between humans and replicants becomes unclear. It also depicts a postmodern vision of a dystopian Los Angeles future where advertising dominates and people escape to more virtual realities.