The double-sized conclusion! The G.I. Joe team and the Autobots face the most bizarre and unbelievable threat they've ever faced! Cobra-La strikes, and with them comes the devourer of worlds -- Unicron! How does Joe Colton fit into all of this? The fate of millions depends on if Cobra-La's insidious plans can be stopped! Plus -- the unrevealed origin of Unicron!