Justice League: Throne of Atlantis

The film follows Arthur Curry, a half-Atlantean prince, as he discovers his heritage and aids the Justice League in preventing a war between the surface dwellers and the Atlanteans, orchestrated by his half-brother Ocean Master. The Justice League, including Batman, Superman, Wonder Woman, Green Lantern, and Cyborg, team up with Arthur to battle the Trench, monstrous creatures from Atlantis, and Ocean Master, who seeks to take over Atlantis. With the help of Mera, Arthur's Atlantean mother, and the Justice League, Arthur discovers his powers and joins the team as Aquaman, helping to bring balance between the two worlds.