The world falls into darkness when the villainous terrorist organization Cobra launches a devastating assault on the aircraft carrier USS Flagg and unleashes a fearsome device called the Blackout Sphere. In an instant, the weapon knocks out all electrical equipment across the entire globe, plunging civilization into chaos and handing Cobra total victory on a day they triumphantly proclaim "C-Day." With the world now under Cobra's iron grip, the elite special forces unit known as the G.I. Joe team finds itself hunted and scattered. To have any hope of turning the tide, the surviving Joes must discover where their captured leader Duke is being held, track down and reunite their separated teammates, and mount a daring resistance. Against overwhelming odds, the heroes set out to shatter Cobra's stranglehold and reclaim the world.