Portal Stories: Mel

Portal Stories: Mel is a modification and unofficial prequel to Portal 2.

Story
An Aperture Science test subject named Mel arrives at Aperture via train in 1952. 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. After going into the vault, something goes wrong, and she is indefinitely put to sleep. 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. 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. He is actually a core named Virgil, a 'maintenence core' who is stuck in the 'scrapyard' of Aperture, and needs your help. Later after reaching a seal, Mel takes the lift that comes down after opening the seal. Mel later reaches the scrapyard, and then the offices. After finding Virgil, he tells Mel to turn on the power. After turning on the power the voice is heard again. Its name is 'AEGIS', short for 'Aperture Employee Guardian and Intrusion System'. AEGIS begins to flood Aperture with toxic goo. Mel and Virgil take an elevator up to Virgil's testing track, through which they can access the computer room for AEGIS. Mel uses turrets to destroy the computers, and shut down AEGIS. Before shutting down, AEGIS reveals that it was trying to eliminate three targets: Mel, Virgil and GLaDOS. Mel incinerates her portal device, and goes up to the surface, saying goodbye to Virgil. Shutting down AEGIS drained cryogenic reserve power, thus waking up Chell and starting the events of Portal 2.

Mechanics
Portal Stories: Mel's mechanics work similarly to Portal and Portal 2.
 * New '70s portal gun model
 * Mobster turrets (Unused due to the Source Engine's programming.)
 * Advanced, high-difficulty tests