After single-handedly capturing Superman's perennial nemesis Lex Luthor, the bionic Cyborg is invited to join the Justice League of America—but surprisingly turns down the offer. Anxious to have someone his own age as a fellow Team member, the nuclear-powered Firestorm seeks out Cyborg to learn the reason for his reticence. But it will take the intervention of Darkseid and his Parademons, to say nothing of some horrific-looking sea pods, to make Cyborg change his mind.