After failing to defeat Aquaman (Jason Momoa) last time, Black Manta (Yahya Abdul-Mateen II) is still unwilling to give up on revenge for his father and vows to destroy Aquaman. This time, he found the legendary Dark Trident, unleashing an ancient evil more fierce than ever. To fight it, Aquaman turns to his imprisoned brother Orm (Patrick Wilson, also the former King of Atlantis) for help, forming an unexpected alliance. The two must put aside their past grudges and fight side by side to defend the kingdom, save their families, and save the world from the impending disaster.