The Infinitus Saga

The Infinitus Saga is a Justice League United storyline running through issues #6-10 and Annual #1 (2014-2015). The Legion of Super-Heroes travels back from the 31st century after discovering their era has been destroyed by an entity called Infinitus. Brainiac 5 determines that Infinitus' energy signature matches Ultra the Multi-Alien, who is still a young innocent in the present day. The Legion attempts to kill the child to prevent the apocalyptic future, forcing the Justice League United to protect him. Meanwhile, the villain Byth Rok uses Ultra to open a rift in reality, summoning Infinity Wraiths and accelerating the very transformation the Legion sought to prevent.