IODOS, or Internal Overseeing Disk Operating System, is in charge of a secret faction of Aperture Science. He was created before GLaDOS, and wasn't awakened until the switch for the facility was flipped during GLaDOS's second rise. (When Chell was attempting to escape the facility) IODOS is, at first glance, a very polite and welcoming AI. He is charming, seemingly kindhearted, witty and clever. However, he quickly proved himself to be terrifying and dangerous when he released the PYROS and ASMRU into Aperture to rid the whole facility of what he deemed 'unnecessary'. What does he deem unnecessary? Anything that threatens his power. This includes but is not limited to: Turrets, Cores, Cubes, Cameras, humans...and GLaDOS. This is IODOS...and he is watching.
