As the wedding of Green Arrow and Black Canary approaches, the League’s enemies – once more lead by Lex Luthor and the Joker – form the Injustice League.At late notice, Arrow’s bachelor party is moved from a hotel to the Hall of Justice where John Stewart is asked by Hal Jordan to take over as the League’s resident Green Arrow.In Manhattan, Firestorm – searching for Martin Stein – flies into a trap laid by Killer Frost. As he overcomes her, Luthor, Joker and the Cheetah arrive and make short work of him before enlisting Killer Frost and taking her to their new headquarters.At Black Canary’s bachelorette party, Wonder Woman and Hawkgirl get word that Firestorm has been taken to hospital while Batman learns the same thing and takes Red Arrow to the crime scene. They are attacked by members of the Injustice League in both locations with Hawkgirl managing to get to the Hall of Justice to alert the other heroes.