Atlas
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Atlas, P-body's short and stout companion, is one of the two bots GLaDOS built for the Cooperative Testing Initiative, which was devised to phase out human testing. GLaDOS created the testing initiative after Chell killed her the first time, during Portal. Along with P-body, the two bots are pitted against a series of tests built by GLaDOS herself, utilizing the many different aspects encountered by Chell in single-player.
During the final phases of testing, GLaDOS reveals that, while the Cooperative Testing Initiative has its uses, she needs human testing for science, not robots. GLaDOS reveals that there are humans locked away, deep within the ancient Aperture facilities. There the bots will be tasked with navigating the old test chambers and unlock the massive vault containing the humans, seemingly kept in place by some form of cryogenic storage. By doing this, they 'save science.'
Trivia
In the pre-release video, "Bot Trust", the prototype Atlas in the Unilateral Force-Induced Isokinetic Breakfast Trials wields the same frying pan found in L4D2.
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