Three nights have passed since the terrible device known as Von Folgers' Eye was unleashed on Paris, and now its unstoppable course has taken it across Europe and America. The Experts of Justice launch the mighty airship Greta Garbo, but the forces of Big Fire are not content to stand by and watch their masterpiece defeated.

Giant Robo lies in ruins after the magnetic attack on Von Folger's Eye failed. Taiso, meanwhile, confronts his old enemy in an attempt to buy his colleagues more time to escape the doomed city before the Eye activates.