After the events of Superman Unbound, Superman and Supergirl had restored the kryptonian city Kandor in a lonely planet with a red sun, now the kryptonians are reborn in all its glory inside the universe, but no good deed goes unpunished, Superman's arch-nemesis Lex Luthor decides to create a plan to get revenge on Superman and destroy the renewed Kryptonian society in the name of humankind existence, the same time General Zod and his army is released from the Phantom Zone by Luthor to aid him in his war against the old kryptonian goverment and the House of El, which would later create a great kryptonian conflict not just against the humans but also against the Justice League, the United Planets and the Green Lantern Corps; Superman and Supergirl must decide in what big responsabilities should they hold on Earth or on Krypton.
