As he barely recovered from the loss of his fortune, Batman reinvested a new headquarters, backed by his new aide-de-camp, Julia Pennyworth. This is the moment the League of Justice chooses to attack Gotham! The Black Knight's allies are actually manipulated by a gas attack on their minds and distorting their faces into a grim smile... The Joker thus makes his great return to the hero's life... and this time no Gotham resident will be spared!