After eliminating General Zod & the other Kryptonian arch-villains, Ursa & Non, Superman(Brandon Routh) leaves Earth to try to find his former home world of Krypton after astronomers have supposedly found it. When he finds nothing but remnants, he returns home to Earth - to find out that Lois Lane(Kate Bosworth) is engaged to a relative of his boss, and that Lex Luthor(Kevin Spacey) is at it again - after swindling an elderly, terminally ill woman. 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 Luthor's sinister scheme, Superman must again race against time to stop the psychopathic Luthor before millions - possibly billions - are killed.