In the hands of G.I. Joe, the Broadcast Energy Transmitter is a device capable of fulfilling all of the energy needs of Earth. However, in the hands of Cobra and the newly revealed Cobra-La, led by the ancient and otherworldly Golobulus (Burgess Meredith), the B.E.T. could spell the end of human civilization. With Duke critically wounded on the battlefield, it is up to Lieutenant Falcon (Don Johnson) and a new class of G.I. Joe recruits, trained by none other than Sergeant Slaughter, to prevent Golobulus from infecting the entire globe with deadly mutating spores!