After four seasons, HBO has cancelled their once hugely popular sci-fi series Westworld, Deadline reports. The fourth and last season aired this past summer.

The story began in 2016 in Westworld, a technologically advanced Wild-West-themed amusement park populated by android hosts. The park caters to high-paying guests who may indulge their wildest fantasies within the park without fear of retaliation or consequences from the hosts, who are prevented by their programming from harming humans. Later on, the series’ setting expands to the real world, in the mid-21st century, where people’s lives are driven and controlled by a powerful artificial intelligence named Rehoboam.

HBO said in their statement: “Over the past four seasons, Lisa and Jonah have taken viewers on a mind-bending odyssey, raising the bar at every step. We are tremendously grateful to them, along with their immensely talented cast, producers and crew, and all of our partners at Kilter Films, Bad Robot and Warner Bros. Television. It’s been a thrill to join them on this journey.”

Kilter Films added, “Making Westworld has been one of the highlights of our careers. We are deeply grateful to our extraordinary cast and crew for creating these indelible characters and brilliant worlds. We’ve been privileged to tell these stories about the future of consciousness – both human and beyond – in the brief window of time before our AI overlords forbid us from doing so.”

The sci-fi series starred Evan Rachel Wood, Thandiwe Newton, Ed Harris, Jeffrey Wright, Tessa Thompson, Luke Hemsworth, Angela Sarafyan, Aaron Paul, and Ariana Debose.