Shutting down AEGIS drained cryogenic reserve power, thus waking up Chell and starting the events of Portal 2. Mel incinerates her portal device, and goes up to the surface, saying goodbye to Virgil.

Before shutting down, AEGIS reveals that it was trying to eliminate three targets: Mel, Virgil and GLaDOS. Mel uses turrets to destroy the computers, and shut down AEGIS. Mel and Virgil take an elevator up to Virgil's testing track, through which they can access the computer room for AEGIS. AEGIS begins to flood Aperture with toxic goo. Its name is 'AEGIS', short for 'Aperture Employee Guardian and Intrusion System'. After turning on the power the voice is heard again. Mel later reaches the scrapyard, and then the offices. Later after reaching a seal, Mel takes the lift that comes down after opening the seal. He is actually a core named Virgil, a 'maintenance core' who is stuck in the 'scrapyard' of Aperture, and needs your help. It tells her to pick up an ASHPD to participate in a 'new test.' After a few tests, he decides to stop the act, and reveals he isn't Cave Johnson, and they are in the future and stuck inside of Aperture. Later, far into the future, she is waken up by a voice pretending to be Cave Johnson that is trying to convince her it is 1952, despite the fact that the facility is deserted and filled with items from the 1970s (the voice claims that there was an earthquake that brought items from the future). After going into the vault, something goes wrong, and she is indefinitely put to sleep. Cave Johnson tells her that she will be testing the Short-Term Relaxation Vault, and tells her she will be asleep for a few minutes, or at most an hour. An Aperture Science test subject named Mel arrives at Aperture via train in 1952.

Half life track power