Seeking to rid themselves of their enemies, the brilliant and egotistical Lex Luthor and the sadistic and criminally insane Joker form an uneasy alliance in order to kill both Superman and Batman once and for all, with the Joker secretly planning something that could threaten the entire world. When the threat proves too dire, Batman forms a legion, consisting of the most brave and noble superpowered humans in order to put a stop to both Luthor and Joker's sinister plot once and for all.
