How many times did you watch that amazing Portal 2 trailer? Enough to catch a glimpse of an old friend?
Take a look behind the busted supports on the right side of the screen.
I say "friend" because while you do form a bit of an attachment to the Companion Cube during the game, the unrelenting over-use of the little box as a meme eventually turned it into something of an enemy for many.
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Let's hope that's exactly why it's there. It's now an Enemy Cube. And you have to hunt it down and tear its little pink hearts out.