

Metropolis is the center of power, ruled with justice by Big Brother. But the Brother of the Night, Lord Graal, exiled on Noxon, is meditating revenge. He is supported by Lady Agatha and the scientist Kraspin, as well as a group of Nurek warriors. Krapin's plan is to take possession of the Kappatron, a force capable of transforming human beings into "humanoids", that is, into indestructible monsters with which to exterminate all rivals of the tyrannical Brother of the Night.