GLaDOS


 * Tater_Fied.pngTeh_kake.png"We're a lot alike, you and I. You tested me. I tested you. You killed me. I—oh, no, wait. I guess I haven't killed you yet. Well. Food for thought."
 * ―GLaDOS

The Genetic Lifeform and Disk Operating System of the Aperture science enrichment center is the main antagonist throughout poortal and the first half of Portal 2's single-player campaign. As the overseer, GLaDOS resides by the central AI chamber

GLaDOS briefly becomes an ally during the single-player campaign of Portal 2 when wheatly takes over the facility. In the cooperative campaign, she is the testing supervisor for ATLAS and P-Body