Summary

After crafting a monumentally over-the-top plan to take over the world by expanding the polar ice caps, mastermind Lex Luthor is missing and widely presumed dead. One thousand years later, Luthor is discovered and memorialized in the Legion of Super Heroes’ museum, where the teenage super hero, Karate Kid, accidentally releases him. The museum contains both the knowledge of Superman’s secret identity and a way to time travel, in the form of the mysterious Time Trapper. Once Lex Luthor is free, he quickly sets out on a mission to permanently erase Superman from the time stream.   For the Justice League – Superman, Batman, Wonder Woman, The Flash, Cyborg and Aquaman – along with Robin and teen super heroes Karate Kid and Dawnstar, the stakes have never been higher. Facing the deadliest rescue mission to date, the future lies in the hands of the Justice League as it struggles to confront its most critical challenge: the threat of having never existed!