after saving chell, glados speaks kindly to her, explaining that when she was created, she was given part of caroline's personality. she thanks chell for helping her find where caroline's personality is in her "brain", then deletes it. returning to her former self, glados tells chell that she is too difficult to kill so she will stop trying and release her instead. chell is sent to the surface by an elevator while the turrets sing opera. once she makes it out, the companion cube is thrown at her, and she is free to go. as the credits roll, glados sings the song "want you gone".