In Aquaman 3 (2025), Arthur Curry faces his greatest challenge yet, one that threatens not only Atlantis but the entire surface world. After years of maintaining a fragile peace between land and sea, a new threat emerges from the deepest, uncharted trench — an ancient civilization long believed to be extinct. These undersea warriors, known as the Abyssal Dominion, wield powers even the Atlanteans have never encountered, and they are determined to reclaim the oceans from all who dwell above them.

The crisis begins when a series of cataclysmic tidal waves strike coastal cities around the globe. Arthur discovers that the Abyssal Dominion has awakened a colossal leviathan to devastate the surface, believing humanity’s pollution and exploitation of the seas are unforgivable crimes. As king of Atlantis, Arthur must rally his people, but political divisions threaten unity. Some Atlantean factions see the Dominion’s cause as just, while others fear the destruction it will bring.

Seeking guidance, Arthur reunites with Mera, whose diplomatic skill is crucial in trying to build an alliance. Alongside them are Orm, Arthur’s half-brother, whose loyalty remains uncertain, and a new ally, Naida, a warrior-scholar from a hidden ocean realm with knowledge of the Dominion’s ancient magic. Their journey takes them through perilous underwater landscapes, from glowing coral labyrinths to the crushing depths of the hadal zone, each guarded by deadly creatures.

As the team ventures deeper, they uncover the Dominion’s true leader, Queen Thalyra, a charismatic yet ruthless ruler who blames Atlantis for abandoning their kin centuries ago. Thalyra offers Arthur a grim ultimatum: surrender Atlantis and withdraw from the surface world, or watch both realms be torn apart. Torn between his duty as a king and his role as a protector of all life, Arthur struggles with a decision that could define his legacy.

The final battle erupts beneath the polar ice caps, where the leviathan’s power is amplified by the Dominion’s ancient storm-forging weapon. Arthur, wielding the Trident of Atlan infused with new elemental energy, faces Thalyra in a clash of strength and ideals. Meanwhile, Mera and Orm lead a desperate fight to disable the weapon before the ice shelves collapse, triggering a global flood.

In the aftermath, the Dominion retreats, but the cost is heavy — alliances are strained, and Arthur realizes peace will require more than victory in battle. As Atlantis rebuilds, Arthur contemplates a future where unity between realms must be forged through trust, not fear. Aquaman 3 delivers breathtaking visuals, intense underwater warfare, and a powerful story of leadership, sacrifice, and the enduring fight for balance between worlds.