The sequel follows Aquaman as he prepares for another battle against Black Manta. Equipped with the deadly Black Trident, Black Manta is determined to avenge his father's death. With no one by his side, Aquaman seeks the help of his brother Orm, hoping to build a strong alliance that can empower him to defeat Black Manta who vows to kill him at all costs. Aquaman must push himself and overlook the differences he has with his brother to save the world from destruction.