G.I. JOE: Mission Critical - Cobra Ascendant ExpansionThe Serpent Rises! Gather your team and prepare for battle! Cobra is on the move, and this time theyre led by the sinister Serpentor. Youll also face the unrelenting one two punch of the twins Xamot and Tomax. But, hope is not lost! Youll be joined by the explosive firepower of Bazooka and Rock n Roll, as well as all new vehicles to add to your arsenal. This is an expansion. G. I. JOE Mission Critical is required to play. Features: Play as new Heroes