Hit tower defense game Defense Grid is set to receive some Portal themed DLC. Defense Grid: You Monster is a full story expansion featuring GLaDOS, the menacing AI from Valve’s awesome Portal franchise. This time players will battle not only alien hordes, but the deviousness of GLaDOS as she tests your skills and changes all the rules. The DLC adds 8 new maps, 35 challenge missions, new achievements and over 15 hours of additional game play. Defense Grid: You Monster will be available December 7 for 400 MSP.

And there’s more! You might want to check out the latest update for the game, for this week a free update was released that gives your existing Defense Grid some UI updates, a few new game modes and over 30 new challenge missions so you have something to play “right now” while you wait for Wednesday to come. Don’t expect any cake though…