Beneath the ocean waves, the lost continent of Atlantis simmers with brewing unrest. Queen Atlanna’s eldest son, Orm, harbors a burning hatred for the surface world, blaming humanity for centuries of pollution and warfare. Believing that Atlantis must strike first to claim total global supremacy, Orm orchestrates a devastating submarine attack, intentionally triggering a war-like provocation against the surface dwellers. To execute his treasonous coup, Orm allies with the ruthless mercenary Black Manta, assassinating his own mother and framing humanity to manipulate his younger, half-human brother, Arthur Curry, into claiming the throne or joining the impending carnage.Meanwhile, on land, the newly formed
Justice League—consisting of Superman, Batman, Wonder Woman, Green Lantern, the Flash, Cyborg, and Shazam—struggles to gel as a cohesive unit. When the casualties from the Atlantean strikes begin mounting, Cyborg discovers the sophisticated technology used in the attack originates from the ocean depths. Sensing an imminent global crisis, the heroes mobilize, unknowingly walking straight into Orm’s meticulously laid trap.Arthur Curry, a rough-around-the-edges barman living in Maine who is unaware of his royal heritage, suddenly finds himself hunted by Atlantean commando squads sent by Orm. During a brutal coastal clash, Arthur is rescued by Mera, an Atlantean warrior loyal to the late Queen Atlanna. Mera reveals Arthur’s true lineage, explaining that he is the rightful heir to the Atlantean throne and the only one capable of stopping Orm. Initially reluctant, Arthur agrees to journey to Atlantis to uncover the truth, where he learns of his mother's murder and Orm’s twisted ambition to crown himself the "Ocean Master."Back on the surface, Ocean Master unleashes a monstrous tidal wave and an army of mutated sea-beasts upon Metropolis, aiming to crush humanity's spirit completely. The
Justice League engages in a desperate, sprawling battle against the overwhelming aquatic horde, struggling to hold the line against the sheer devastation.Just as despair threatens to consume the heroes, Arthur arrives, fully embracing his destiny as Aquaman. He leads the charge, confronting his treacherous brother in a brutal, city-leveling showdown. With the Justice League neutralizing Orm’s forces, Aquaman ultimately defeats Ocean Master in single combat, shattering his ambitions of conquest and exposing his patricide to the surviving Atlantean soldiers. With the crisis averted and peace restored between land and sea, Arthur ascends the throne as king, uniting two worlds and earning his rightful place among Earth's greatest protectors, while the Justice League solidifies its enduring legacy.