Following the killing of humans in the park by hosts, Dolores leads the robot revolt in Westworld season 3. She enters the “real world” to eliminate Rehoboam, an artificial intelligence software co-created by a highly wealthy and malicious man named Serac. Serac intends to use it to dominate the world by running an algorithm that anticipates what individuals will do.

Caleb, an ex-soldier and construction worker who dabbles in petty criminality, assists her in her objective. They obtain access to Rehoboam’s data and release them, causing havoc. They then travel to Mexico in search of Solomon, Rehoboam’s prior incarnation. Caleb is told by the AI that he is an “outlier,” or someone who could elude the algorithm’s predictions. He was effectively re-trained to seek out other outliers. Those that cannot be reconditioned are placed in cold storage.

Solomon has devised a new strategy for defeating Serac and liberating humanity from Rehoboam’s tales.

Serac vs Charlotte

Charlotte Hale, a host who is a duplicate of Dolores, tries to take over Delos but is stopped by a takeover bid from Serac, who wants the company’s data. She has William committed to a mental institution so that she can utilize his Delos voting rights to defeat the bid.

Serac purchases Delos after her manipulation fails. Charlotte grabs the company’s host data and uploads it to a secret, safe location, knowing she’s soon to be caught. She survives a horrific car accident but vows vengeance on Dolores for leaving her.

Dolores vs. Maeve

Meanwhile, Maeve wakes up at a World War II-themed park after the massacre. She commits suicide to return to Operations, but it turns out to be a ruse. She escapes free and wakes up in Serac’s house in a new body. He enlists her assistance in locating Dolores.

Maeve tracks her down in Mexico, but Dolores and Caleb getaway. She approaches them later, though, and captures Dolores.

Serac connects Dolores to Rehoboam to track down the Delos host data that Charlotte has stolen. When the AI is unable to locate it, it begins to destroy her memories. Caleb arrives to save her, but Maeve intervenes.

Maeve bursts through her behavior inhibitor murders the guards and injures Serac when Dolores begs her to help humanity. Solomon’s program, which gives Caleb authority over Rehoboam, is Dolores’ final recollection. Before leaving with Maeve, he commands Rehoboam to obliterate itself.

William and Bernard

Bernard has been on the run since he was falsely accused of the massacre. Caleb’s identity as an outlier is revealed to him, and he feels he will someday destroy the planet. He frees William from the mental institution with the help of Ashley Stubbs. William declares that all surviving hosts will be destroyed before fleeing.

William later breaks inside a Delos building and runs into Charlotte. It has hundreds of machines that produce hosts. However, a host replica of himself slits his throat before he can accomplish anything.

Bernard, stranded in a motel, realizes Dolores handed him the key to the Sublime (aka Valley Beyond). He decides to enter it, and his body becomes still. Bernard wakes up covered in dust after some time has passed (perhaps months or even years).