With the godlike maniac called the Batman Who Laughs as a secret weapon, criminal mastermind Lex Luthor continues to assemble his Legion of Doom, pulling in Wonder Woman's and Aquaman's archenemies Cheetah and Black Manta. But an even deeper and deadlier threat is on the way. The ancient sea gods called the Ocean Lords have risen, and their grudge against Atlantis and the Amazons threatens to drown the Earth. Arthur, Diana and the rest of the League must stop both the Legion and the Lords--or the secrets now surfacing could drag all hope away in the undertow...