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The Oracle Turret is a friendly Sentry Turret that is encountered twice in Portal 2. Though never named in-game, it is known for its cryptic speech of future events and exposition.

Oracle Turret

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Cave Johnson

Cave Johnson is the founder of Aperture Science, which was built from Aperture Science Innovations. He was briefly mentioned in Portal, but makes a more prominent appearance in Portal 2, in the form of tape recordings he leaves behind. His current status and whereabouts are unknown, presumed dead.

Cave Johnson