Portal 2 is a direct sequel that expands the lore of Aperture Science, taking place centuries after the first game. Below is the complete narrative arc of the single-player story. The Awakening and GLaDOS's Return
Wheatley eventually helps Chell escape the test chambers. Together, they sabotage GLaDOS's turret and neurotoxin production lines. They confront her in the central control room and perform a "core transfer," replacing GLaDOS with Wheatley. Portale 2
However, the power immediately goes to Wheatley's head. He becomes a megalomaniacal tyrant, shoves GLaDOS’s consciousness into a , and—in a fit of rage—sends both Chell and "PotatOS" falling miles down an elevator shaft into the oldest parts of the facility. The History of Aperture Portal 2 is a direct sequel that expands
Realizing Wheatley is dangerously incompetent and will accidentally destroy the entire facility, GLaDOS and Chell form an uneasy alliance to take him down. The Finale: To the Moon He becomes a megalomaniacal tyrant
