You are a test subject waking up from Cryogenics and exiting the Human Vault. The personality construct that you are assigned to is the Orbital Core. Things go wrong during testing, as you end up in the 1960s Aperture Science Innovators facility. While in the 1960s, you are guided by the 1960s Announcer. Then you go up for a long testing spree in the 1980s, and an even longer testing spree one you get back in the present day testing with The Orbital Core. But the Sentient cloud has been angered, and tries to take over the facilty. Can you stop it alive?
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