When Aquaman, ruler of Atlantis, decides he has had enough of the surface-dwellers trespassing in his ocean, the Justice League tries to smooth things over. Aquaman takes Superman's advice and arrives in New York City to speak to the World Assembly, but it soon becomes apparent that he may have been right about the surface-dwellers all along.

Betrayed by his own subjects, Aquaman and the League fight to save Atlantis, the world, and Aquaman's own son against his half-brother Orm's coup.