In a futuristic world, a technologically advanced theme park allows guests to immerse themselves in an Old West fantasy populated by highly sophisticated humanoid robots known as hosts. These hosts, designed to cater to the visitors' every desire and whim, follow intricate storylines crafted by the park's creators. They are periodically wiped clean of memories to ensure fresh narratives. Central to the narrative is Dolores, a rancher's daughter host whose seemingly routine existence is upended as she slowly becomes aware of her true nature and begins to question the reality around her. Meanwhile, park guests indulge in adventures ranging from romantic escapades to violent encounters, fully exploiting the lack of consequences. Bernard, a key park technician, works tirelessly to maintain the park's delicate balance while grappling with his own suspicions that not everything at the park is as it seems.

The plot unfolds through multiple timelines, exploring themes of consciousness, free will, and the ethical ramifications of artificial intelligence. The creators of the park, Dr. Robert Ford and others, wrestle with the potential dangers of their creations gaining autonomy. As hosts begin to experience memories of past events, cracks emerge in the park's seamless façade. The boundaries between reality and artificiality blur, leading to unpredictable outcomes. The underlying tension escalates as different characters pursue their own agendas: some seeking enlightenment, some revenge, and others control over the park's vast potential. Conflicts arise not only between humans and hosts but also within each group as allegiances shift and true intentions are revealed. This exploration challenges the visitors and hosts to confront their identities and what it means to be sentient.