Derec y Ariel logran al fin huir de Robot City. Ambos viajan a la Tierra para buscar la forma de salvar la vida de la muchacha y encontrar las restantes pistas que les permitan averiguar el secreto de Robot City. Derec, enfrentado con la sociedad subterránea de la Tierra, debe decidir si su futuro está en las cavernas de acero o en los confines fantásticos de una improbable metrópolis.
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