Portal 2 Teaser Trailer is a video which was released by Valve on June 15, 2010 in order to promote Portal 2. The video features a mixture of pre-rendered and in-game footage that showcases the Aperture Science Facility in which Portal 2 is set, and also reveals that GLaDOS will be an integral part of the game.
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| GLaDOS: It's been a long time. How have you been?
[Music plays] GLaDOS: I think we can put our differences behind us. For science. You monster. |