Cobra have just proved that there is no line they're unwilling to cross - not even the line between living and dead! With the insidious Compound Z, the terrorist organization hopes to unleash absolute chaos on the world in the form of relentless, remorseless undead hordes that stalk the streets looking to turn anyone they find into more mindless fodder for Cobra's reanimated army. Desperate for a counterploy, G.I. Joe has rushed Flint and the ECO Warriors back into commission. Will their ingenuity save the save? Or will the boots of the marching dead thunder on?