Cobra: one word that strikes fear in the hearts of both soldiers and politicians. The vision of a fanatic determined to overthrow the United States government. The most deadly, secretive terrorist group ever assembled. The menace G.I. Joe was created to combat. Its influence permeates every level of society: Government...finance...military... And even G.I. Joe? For this is Cobra's hidden weapon, its most insidious success: an agent within the unit meant to take it down. Even as the Joes scramble to contain Cobra's threat, suspicion begins to eat at them from within...and the turncoat is the last among them any would suspect. Snake-Eyes, Scarlett, Hawk, Duke, Stalker, Lady Jaye, Beach Head, Roadblock. One of them is a traitor - and if the Joes don't ferret out the turncoat before he or she destroys the team, Cobra's ultimate victory is assured...