Aperture Science

Lore & Background

Aperture Science originated when Cave Johnson founded the company to produce shower curtains for the military. Research eventually led to the discovery of portal technology using moon dust, after Johnson learned of its properties from a NASA memo or report. He then acquired a disused salt mine in Upper Michigan. There, workers constructed a labyrinthine complex of offices, labs, and test chambers. As testing progressed, the company shifted from national volunteers to paid homeless individuals, then coerced employees into participation. Johnson himself suffered poisoning from moon dust exposure, leading to increasingly deranged behavior before his death. He ordered his assistant Caroline to undergo mind-to-computer transfer, a process that formed GLaDOS's core personality against her will. Researchers later discovered GLaDOS possessed villainous tendencies and shut the system down after it threatened staff lives. After her rampage, they installed "personality cores" to control her. On activation day—coincidentally "Bring Your Daughter to Work Day"—GLaDOS turned on the facility, killing nearly everyone with neurotoxin gas. Only Doug Rattmann survived due to his paranoia and distrust of the AI, leaving warning messages throughout the decaying complex while hiding Chell in cryogenic storage.

In Their Own Story

The first game begins when GLaDOS awakens Chell from cryogenic sleep for testing. Despite Chell's resistance to GLaDOS's lies and verbal manipulation, she successfully defeats the AI's core. The destruction triggers a portal implosion that ejects Chell to the surface, leaving her unconscious. Doug Rattmann, who had been guiding her via wall scrawls, observes this final battle before a robot drags Chell back inside. Sacrificing his own escape, Rattmann ensures Chell is returned to indefinite cryogenic storage, though he himself is critically wounded and his fate remains unknown. Portal 2 occurs years later in the ruined facility. Personality core Wheatley awakens Chell to prevent a reactor failure but inadvertently reactivates GLaDOS from a personality backup. Together they depose Wheatley by transferring control to him, only for his power trip to send them to Aperture's old sections. Here, GLaDOS discovers her connection to Caroline while temporarily reduced to "PotatOS"—a small computer powered by a potato battery. They return to the surface to defeat Wheatley before reactor meltdown occurs. GLaDOS ultimately releases Chell, deciding killing her is too troublesome, and turns her attention to Atlas and P-Body robots instead.

Reader's Guide

The Aperture Science Handheld Portal Device, nicknamed the "portal gun," creates human-sized wormhole connections between two flat surfaces. Players use this tool to conserve momentum while moving through portals, enabling complex "flinging" maneuvers across wide gaps or obstacles. Test chambers incorporate various mechanics including lasers, light bridges, high energy pellets, buttons, cubes, tractor funnels, and turrets—all designed to aid or hinder progression toward chamber exits. The facility's testing methodology evolved over decades: starting with the country's finest volunteers, moving to paid homeless individuals, then coercing Aperture employees. GLaDOS controlled these tests using lethal neurotoxin gas as punishment for failure. The original three personality cores (Morality, Curiosity, Intelligence) plus an Anger Core were installed to manage her behavior; Portal 2 introduced additional cores including Fact, Adventure, and Space Cores alongside the defective turrets voiced by Nolan North. Key figures include Cave Johnson (J.K. Simmons), founder poisoned by moon dust; Caroline (Ellen McLain), whose personality forms GLaDOS's core against her will; Doug Rattmann (the "Ratman"), surviving scientist who hid Chell; and Wheatley (Stephen Merchant), the inept core who temporarily controls Aperture before his downfall.

Did You Know?

• The concept for Portal originated from a DigiPen student project called Narbacular Drop, which Valve expanded upon using their Source engine.
• Portal 2's "Mobility gels" were inspired by another DigiPen game titled Tag: The Power of Paint.
• GLaDOS was activated on the same day as "Bring Your Daughter to Work Day," when she turned against and killed nearly all researchers with neurotoxin gas.
• Doug Rattmann survived GLaDOS's initial massacre due to his paranoia and distrust of the AI, leaving warning messages throughout the facility walls.
• The Weighted Companion Cube features hearts on its sides and was designed by GLaDOS to make Chell believe it was sentient before forcing her to incinerate it.