The teaser for the fourth season of Westworld that dropped last month was tonally evocative and visually stunning, but it told us very little about what to expect from the narrative. Now we have the full trailer, and it has made us eager to learn more, as it looks like the show is about to head into some very interesting places.

(Spoilers for prior seasons below.)

As we've reported previously , Westworld 's third season was the first to take place largely outside the tightly controlled environment of the original theme parks. Opening three months after the events of the S2 finale, Dolores (Evan Rachel Woods) had re-created her host body. We learned she was targeting an AI system called Rehoboam, which was developed by a company called Incite. To access the system, Dolores had to take on its creator, Engerraund Serac (Vincent Cassel), and various other adversaries with their own motives for stopping her—including William, aka the Man in Black (Ed Harris), who vowed to destroy any remaining hosts.

HBO dropped the first teaser trailer for the upcoming fourth season of its visionary sci-fi drama, Westworld , and it looks like we're in for another wild, convoluted ride.

(Spoilers for first three seasons of Westworld below.)

As I've written previously , the titular Westworld is one of six immersive theme parks owned and operated by a company called Delos Inc. The park is populated with a "cast" of human-looking androids, called hosts. The park's well-heeled visitors can pretty much do whatever they like to the hosts and don't generally view the hosts as anything more than unfeeling props in their private dramas. But the hosts' creator/co-founder and park director of Westworld, Dr. Robert Ford (Anthony Hopkins), "awakened" a host named Dolores (Evan Rachel Wood) to true sentience. The first season concluded with a bloody massacre, as the reprogrammed hosts rose up to take revenge on the guests.