Westworld is an American dystopian science fiction Western drama television series. It is based upon the 1973 film of the same name written and directed by Michael Crichton and loosely upon its 1976 sequel, Futureworld. The story begins in Westworld, a fictional, technologically advanced amusement park populated by android "hosts" The first season was the most-watched first season of any HBO original series, until The Last of Us debuted in 2023. HBO canceled the series in November 2022.