Leaks confirmed yet again.
Arthur Curry (Jason Momoa) is the son of lighthouse keeper Tom Curry (Temuera Morrison) and Atlantean queen Atlanna (Nicole Kidman), who abandoned him as a child in order to protect him. Tom approached marine biologist Dr. Stephen Shin (Randall Park) to help Arthur control his powers, but later sent him away when he learned that Shin was planning to exploit Arthur.
One year after Steppenwolf's invasion, Arthur is protecting the oceans and confronts pirates who had hijacked a nuclear submarine, leaving their leader Jesse Kane (Michael Beach) to die. Jesse’s son, David Kane (Yahya Abdul-Mateen II), swears revenge against Arthur and is later hired by Arthur’s half-brother, king Orm (Patrick Wilson), to stage an attack against Atlantis that Orm uses as a pretext to rally king Nereus (Dolph Lundgren) to help him declare war on the surface world.
Nereus’ daughter, Mera (Amber Heard), disagrees with Orm and recruits Arthur for help at the behest of their mentor, Vulko (Willem Dafoe), who reveals that Arthur must find the Trident of Atlan, an artifact that once belonged to the first king of Atlantis, to prevent the war. Upon learning that Atlanna was executed for having a half-breed son, Arthur challenges Orm to a duel for the throne, but is defeated and escapes with Mera to the Sahara, where Atlantis was once located, to unlock a message from king Atlan (Graham McTavish), revealing that the Trident of Atlan is in Sicily. Orm locates them and sends David, clad in an Atlantean battlesuit and calling himself “Black Manta”, to stop them.