AEGIS' last action before shutting down completely was to awaken a certain test subject. Mel finally shut down AEGIS, saving the Enrichment Center, allowing Mel to leave, and inadvertently allowing GLaDOS to live as well. After climbing on top of AEGIS' massive chassis, Mel entered the inside of AEGIS, which revealed a computer terminal and a desk littered with notes. After Mel had destroyed most of AEGIS' servers, AEGIS willingly shut down and demanded 'user input' for further instructions. By the time Mel got to AEGIS' core, AEGIS began to pump lethal oxygen supplies into its central chamber in an attempt to suffocate Mel. It eventually settled upon flooding the Enrichment Center with toxic goo from the vitrified testing shafts below.Īfter Mel was awakened by Virgil and slowly began ascending the testing tracks to AEGIS' central AI chamber, AEGIS detected their presence, laying traps for Mel along the way as AEGIS continued to rank Mel and Virgil as bigger threats for every trap they overcame. Having correctly detected that GLaDOS killed every Aperture employee, AEGIS began calculating a way to destroy the now-deactivated GLaDOS permanently. Some time after the events of Portal after the shutdown of GLaDOS, but before the events of Portal 2, AEGIS came online. Despite this, AEGIS is somehow in the upper facility of the modern Aperture Science Enrichment Center, possibly being moved there between the company's migration from the aging Aperture Science Innovators testing shafts. Its design and construction, consisting of 1950's era mainframe parts and sporting a 1960's Aperture Science logo, suggest AEGIS was built even before the GLaDOS project began development of Aperture's AI constructs.

Mel's last name is unknown to the public for unknown reasonsĪlthough AEGIS is an artificial intelligence, it does not display any sort of personality or will, as it functions more as a set of protocols.

AEGIS' responsibility in the Enrichment Center is, as it's name implies, to ensure the safety of all Aperture employees. The Aperture Employee Guardian and Intrusion System or AEGIS is the central security system of the Aperture Science Enrichment Center and the main antagonist of Portal Stories: Mel.

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