After defeating three different Jokers with the help of two different variants of the Batfamily, Bruce Wayne and most of his Batfamily must now help the Justice League and Teen Titans defeat The Legion of Doom, a team that has been reborn thanks to now being led by Jack Luthor and Jeremiah Valeska, the fifth ever Joker. But will this conflict end with victory, or will it end in a bloody set of affairs?
