Westworld, written and directed by Michael Crichton and released in 1973, was a seminal science fiction movie starring Yul Brynner as a malfunctioning robotic Western movie-style gunslinger in a futuristic amusement park where wealthy patrons vacation to role-play their fantasies. The title refers to the name of one of the three themed parks in the movie. Brynner's character, a relentless, emotionless, uncompromising robot bent on the pursuit and destruction of his target, foreshadows Arnold Schwarzenegger's characters in The Terminator series of movies.

Westworld was followed by a sequel, Futureworld , in 1976, and by a short-lived sequel television series, Beyond Westworld in 1980.