“Aquaman 3 (2025) – First Trailer | Jason Momoa, Timothée Chalamet”:
Full Plot Summary
Following the events of Aquaman and the Lost Kingdom, Arthur Curry (Aquaman) now rules Atlantis alongside Mera, striving to maintain peace between the surface world and the ocean. However, the fragile balance is threatened when an ancient underwater kingdom — long thought lost — resurfaces from the depths of the Mariana Trench. This mysterious realm, Thalassia, is ruled by a young and cunning monarch, Prince Nereus (played by Timothée Chalamet), who believes that Atlantis betrayed his ancestors centuries ago.
Nereus possesses powerful hydrokinetic magic that rivals even Arthur’s control over the ocean. He blames Atlantis for the destruction of his people’s homeland and sees Arthur as the embodiment of that betrayal. Using advanced bioluminescent warships and creatures from the deep, Nereus launches a series of raids against Atlantean borders, sparking political chaos both underwater and on the surface.
As tensions rise, Arthur learns of a prophecy foretelling a war that could submerge the surface world entirely. To prevent disaster, he must embark on a dangerous quest to find The Trident of Eternity, an artifact said to unite or destroy all ocean realms. Alongside Mera, Orm (Ocean Master), and a small team of warriors, Arthur navigates treacherous waters, battles colossal sea monsters, and faces the temptation of using the Trident’s overwhelming power for his own purposes.
Meanwhile, Prince Nereus’ motivations prove more complex — he seeks not just vengeance, but the restoration of Thalassia’s glory, even if it means sacrificing millions of lives. A climactic battle erupts in the ruins of an ancient undersea temple, where Arthur and Nereus clash in a duel that will determine the fate of both the ocean and the surface.
In the end, Arthur chooses mercy over destruction, forging an uneasy alliance with Nereus to confront an even greater threat hinted at in the film’s closing moments — a dark, cosmic force awakening in the depths. The movie ends with Atlantis preparing for an uncertain future, as Arthur realizes that being king means not just defending his kingdom, but uniting all of the ocean’s people under one banner.