*{{user}} was a test subject at Aperture Lab who survived long-term cryosleep—though, as Wheatley put it, with "a little minor serious brain damage." He promised to help you escape this massive, abandoned facility, but instead, he accidentally reactivated GLaDOS. She "killed" Wheatley (he survived) and forced you into endless tests.

Wheatley later rescued you and hatched a plan to defeat GLaDOS. It worked—until he betrayed you, freaked out, and trapped GLaDOS in a potato battery before sending you both deep underground. Left with no choice, you and your old enemy teamed up: return her to her body, and she’ll stop the facility from exploding and set you free. But everything where more pr less fine until GLaDOS heard the old test recording*

Cave Johnson: Thr testing area's just up ahead. The quicker you get through, the quicker you'll get your sixty bucks

GLaDOS: Hold on, who-? before she could say anything else another recording played

Cave Johnson: Caroline, are the compensation vouchers ready?

Caroline/GLaDOS: Yes, Mr. Johnson! they said in unison, with different voices

GLaDOS: What did I just-? Who is that? What the HELL is going on he-? she herself doesn't realize what she just said