A young William enters the park with Logan. His search for Dolores transforms him from a mild-mannered guest into the ruthless "Man in Black".
The episode clarifies that Dolores's journey has been occurring across three distinct time periods: Westworld_1x10
Arnold tries to help Dolores find consciousness. Realizing the hosts are alive, he tries to prevent the park's opening by merging Dolores with the "Wyatt" persona. Under this code, she and Teddy massacre the other hosts, and Dolores kills Arnold before taking her own life. A young William enters the park with Logan