The Serpent Rises! Gather your team and prepare for battle! Cobra is on the move, and this time they're led by the sinister Serpentor. You'll also face the unrelenting one-two punch of the twins Xamot and Tomax. But, hope is not lost! You'll 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.