One thousand years in the future, a Legion of Super-Heroes comes together to dedicate their lives to recapturing the great age of heroes of the 21st century. When the heroes discover that reality is falling to a great darkness in both times simultaneously, the Justice League and the Legion of Super-Heroes must team up to stop it all. But what is the connection between the secrets of the new Gold Lanterns and the coming of the Great Darkness? A monumental DC epic event miniseries!