Justice League Unlimited. Time after time

"The Justice League has the best-of-the-best heroes trained for the top of their game--together they can tackle an evil that comes into their world. In this thrilling collection, our heroes jet off into the future where they team up with the Legion of Super-Heroes to try to defeat Kilgore! But the future problems have seeds that were planted in the past. Will the Flash be fast enough to return to his own era and stop his Justice League teammates...