In "Aquaman," Arthur Curry, the rightful heir to the throne of Atlantis, must confront his half-brother Ocean Master, who seeks to usurp the throne and declare war on the surface world. With the help of his allies, including Mera and Vulko, Arthur embarks on a journey to reclaim his birthright and unite the seven seas. Along the way, he discovers the true depth of his powers and embraces his destiny as the King of Atlantis.