Rui has learned the truth about his parents' disappearance, but the fight for his family has only just begun. The Joker and Lex Luthor's gambit to harness the magical powers of the ley lines underneath Gotham City is underway, and now they've recruited a new ally to their scheme: Ocean Master! While Batman and the Justice League fight to keep The Joker at bay, Aquaman must go head-to-head with his brother to keep Gotham City from being washed away. But it's Rui and his mother who may hold the key to stopping the mystical plot once and for all--if they can only figure out how!