Westworld is a 1973 American science-fiction Western thriller film written and directed by Michael Crichton. Its plot concerns amusement park androids that malfunction and begin killing visitors. It stars Yul Brynner as an android in a futuristic Western-themed amusement park, and Richard Benjamin and James Brolin as guests of the park.
In the then-future year of 1983, a high-tech, highly realistic adult amusement park called Delos features three themed "worlds": Western World (the American Old West), Medieval World (medieval Europe), and Roman World (the ancient Roman city of Pompeii). The resort's three "worlds" are populated with lifelike androids that are practically indistinguishable from human beings, each programmed in character for their assigned historical environment. For $1,000 per day, guests may indulge in any adventure with the android population of the park, including sexual encounters and a simulated fight to the death. Delos's tagline in its advertising promises "Boy, have we got a vacation for you!"