Superman has left earth and taken residence on the planet of New Krypton along with 100,000 Kryptonians freed from the bottle city of Kandor to prevent a war between Earth and New Krypton. Chaos erupts on New Krypton after a Kryptonian is shot and The Man of Steel will stop at nothing to find the culprit. When the shooter flees to Earth, it"s up to Superman and Supergirl stop the assassin in time to prevent further hostilities between earth and New Krypton. Will their actions cause more harm than good and lead to a war of the worlds?