Aquaman (2018)

In 1985 Maine, lighthouse keeper Thomas Curry rescues Atlanna, the queen of the underwater kingdom of Atlantis, during a storm. They fall in love and have a son named Arthur, who has the power to communicate with sea creatures. When Atlantean soldiers sent by King Orvax arrive to retrieve Atlanna, who fled her arranged marriage in Atlantis, she defeats them but knows the response will only escalate. Forced to leave her family behind to protect them, she promises to return to Thomas one day when safe to do so and returns to Atlantis, entrusting her advisor, Nuidis Vulko, to train Arthur. Becoming a skilled warrior, Arthur rejects Atlantis upon learning that Atlanna was executed by Orvax for loving a human and having a half-breed son.

In the present day, sometime after the defeat of Steppenwolf, Arthur confronts pirates hijacking a Russian Akula-class submarine. Their leader, Jesse Kane, is killed in a failed attempt to kill Arthur, and his son David vows revenge. Orm Marius, Orvax’s son (who is now Atlantis’s new king following his father’s death) and Arthur’s younger half-brother, attempts to convince King Nereus of Xebel to help unite Atlantis and destroy the surface world for polluting the oceans. Nereus notes that if Orm unites all four kingdoms, he will receive the title of Ocean Master, commander of the most powerful force on the planet. A Russian submarine attacks and is destroyed by Orm, convincing Nereus to join forces to defend the oceans.