Welcome to Aperture Science, where the future is now. Or at least it was until you destroyed the megalomaniac AI that was running the place. This was a little over a hundred years ago and the place has not seen any real love. You start the game being brought out of stasis by Wheatly, the AI that is supposed to be in charge of all the humans. Too bad you are the only one left and the others are "bloody vegetables". So now you two are going to try and escape this place before the management comes down and knocks some heads.