Delos is a futuristic amusement park that features themed worlds—ancient Rome, Medieval times and the Old West—populated by human-like androids. After two patrons have a run-in with a menacing gunslinger in West World, the androids at Delos all begin to malfunction, causing havoc throughout the park.

A novice con man teams up with an acknowledged master to avenge the murder of a mutual friend by pulling off the ultimate big con and swindling a fortune from a big-time mobster.