Justice League Unlimited: Destroyer

"Destroyer" is the thirteenth episode of season three of the animated superhero series Justice League Unlimited and the thirty-ninth episode of the series overall. Combining the totals from both Justice League Unlimited and Justice League, it is the ninety-first episode of the series. It is the second part of a storyline that began in "Alive!". The episode was directed by Joaquim Dos Santos and written by Dwayne McDuffie. It first aired on Cartoon Network on May 13th, 2006. In this episode, Lex Luthor's Legion of Doom returns to Earth where they are forced to team up with the Justice League to fight the threat of the alien invader Darkseid.