Black Manta failed in his first attempt to defeat Aquaman. But he is still obsessed with avenging his father's death - and he will stop at nothing to bring down the hated Aquaman once and for all.
This time, Black Manta is more powerful than ever before: he has taken control of the mysterious Black Trident, which is capable of unleashing an ancient and sinister power. To defeat Black Manta, Aquaman turns to his imprisoned brother Orm, the former king of Atlantis, and forms a dangerous alliance with him. The two brothers must resolve their differences in order to protect their kingdom and save Aquaman's family and the world from ultimate destruction.