The psychopathic Luthor, whose plans to destroy California failed because of Superman's heroics, vows vengeance against the Man of Steel and contrives a new sinister plot - using the crystals of Krypton to build a continent that will wipe out most of North America! Embedded in the continent's structure is Kryptonite - the lethal substance that is Superman's only weakness. Upon learning of Luthro's sinister scheme, Superman must again race against time to stop the psychopathic Luthor before millions - possibly billions - are killed.