Legion of Super-Heroes: Season 3

Legion of Super Heroes is an American animated television series produced by Warner Bros. Animation, adapted from the DC Comics series of the same name. Season 3 takes place a year after the finale, with Brainiac 5 leaving the legion after he became human. Superman later goes back to his timeline to form the Justice League while his cousin Kara goes to the future.

Episodes

 * 1) Maid of Might, Part 1 - A year after the events from Dark Victory, The Legion gets hit by an unknown force named Requiem, who has enhanced strength, speed and can fly. Requiem manages to beat every legionnaire as he warns them of a powerful force coming to destroy the world. He then uses his Infinity Blade to destroy most of the city. After the battle, the team decides to recruit Superman's cousin, Kara aka Supergirl.
 * 2) Maid of Might, Part 2 - The Legionnaires get Kara up to speed about Requiem as they try to locate him. Requiem later releases a powerful creature from the Phantom Zone and sets him loose on the legionnaires. The episode ends with Brainiac 6 encountering Brainiac 5.