The Earth is shown to be in ruins and there is no life of any kind. Three aliens visit the Earth and investigate the ruins of the Hall of Justice reviewing historical records of the Justice League of America's conflicts against the Legion of Doom as well as the Legion's individual origins. When they can no longer review anymore data due to a computer malfunction they find the Hall of Doom to discover that the destruction of Earth was inadvertently caused by Lex Luthor and the Legion of Doom i