In Aquaman and the Lost Kingdom, Arthur Curry, the King of Atlantis, is once again forced into battle — not just for his throne, but for the survival of both land and sea. After years of brokering peace between the underwater kingdoms and the surface world, a new threat rises in the form of Black Manta, who returns stronger, more dangerous, and more vengeful than ever.

Empowered by the ancient and cursed weapon known as the Black Trident, Black Manta unleashes dark forces capable of ravaging both Atlantis and Earth. Driven by hatred for Aquaman and the desire to avenge his father’s death, he leads an assault that threatens to destroy everything in his path. Realizing the scope of the danger, Arthur must make a difficult choice — to free his imprisoned half-brother, Orm (the former Ocean Master), and forge an uneasy alliance.

Together, the two brothers navigate treacherous political waters, ancient ruins, and long-buried secrets as they search for a way to stop the rise of an unstoppable enemy. Along the journey, they uncover lost civilizations, confront mythical sea beasts, and face their own inner demons — all while the fate of Atlantis hangs in the balance.