It’s the hosts versus humanity in tantalizing Westworld S4 trailer

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.