The main story is also intersected with flashbacks of the period during which GLaDOS was still being built, showing Rattman's involvement in the project. Through the story, he carries a Companion Cube that he hears talking to him and giving him advice. He is having a monologue about reality and how the mind sees it and is shown to be psychotic, forced to take ziaprazidone to curb the effects of his schizophrenia. Part 1 follows Doug Rattman as he is tracking Chell through the Enrichment Center. The Lab Rat comic bridges the gap between Portal and Portal 2, which introduces us to Doug Rattman, a scientist at Aperture Science who survived the Neurotoxin after GLaDOS' first activation at the Bring Your Daughter to Work Day, which made her self-aware and initiated a lockdown on the facility, and killed most of the scientists with neurotoxin. This version of the game is not canon to the story, as it's confirmed by anonymous Valve developers. Portal: Still Alive is an XBOX Live Arcade port of Portal, containing additional content in the form of new advanced chambers, inspired by Portal: The Flash Version, with no additional story material. The MaPatch modified the ending so that Chell is dragged back into the facility by the unseen Party Escort Bot, that is connected to the Portal 2: Lab Rat comic. Chell awakens to find herself above ground in the parking lot of the facility, with the burning remains of GLaDOS surrounding her.
Using the Portal Device, Chell defeats GLaDOS by removing her personality cores and depositing them in a nearby Emergency Intelligence Incinerator, resulting in a large explosion that blows a hole in the roof dragging both Chell and GLaDOS upwards.
GLaDOS now attempts to do the same to Chell. It is revealed that GLaDOS had murdered everyone in the facility using deadly neurotoxin. Eventually, Chell reaches GLaDOS' lair, where she finally comes face to face with the rogue AI. When she realizes her attempts are in vain, GLaDOS resorts to taunting Chell while continuing her efforts to kill her. While Chell is making her way through the facility, GLaDOS attempts to lure her back with promises of cake and a party, and claims the attempted murder of the player was a misunderstanding. Quickly thinking, Chell escapes a fiery fate using the Handheld Portal Device, and she makes her way through the inner facility via maintenance shafts. When Chell is no longer of any use to GLaDOS, she attempts to kill Chell by lowering her into an incinerator. Motivated with the promise of cake at the end of the testing, Chell is put through tests of increasing complexity. Throughout the facility are hidden dens, containing mad scribblings from an unseen person warning others of GLaDOS. As Chell makes her way through test chambers, it becomes clear the facility is devoid of human life and GLaDOS is testing Chell for her own warped definition of 'science'. The player is introduced to the testing process and mechanics, shortly thereafter obtaining the Aperture Science Handheld Portal Device. The game begins with Chell awakening in a Relaxation Vault, where she is briefed by the voice of GLaDOS coming from speakers, before being released through a portal.