Mechagodzilla®, the superior-armed, state-of-the-art, all-robot version of Godzilla®, is undergoing repairs after his devastating battle against the world's monsters. A pair of psychic fairies appear and warn scientists to stop rebuilding Mechagodzilla® - but their warning goes unheeded. As the great robot nears completion, a series of mysterious incidents rock the world and awaken Godzilla®, who unleashes a reign of terror against Tokyo. Mothra® joins him and Japan's desperate Prime Minister has no choice but to launch the unfinished Mechagodzilla® against Mothra® and Godzilla®. But who will fight for whom? And in the end -- will the survivor be monster, robot or man?