Space Marine's free co-op mode, Exterminatus, has been live for all of one week (one day, for 360 owners), and THQ has just announced plans for additional co-op content. The new DLC will include an Exterminatus campaign titled "Chaos Unleashed." It will put players in the mighty boots of the Chaos Marines. You'll face Orks and the Imperial Guard as the Space Marines' evil, and therefore cooler, counterparts. You just know that all of the Chaos Marines are wearing goatees under their helmets and calling each other "Bro."