[Spoiler alert for Aquaman and the Lost Kingdom.] Four years after Arthur Curry (Jason Momoa) dethroned his half-brother Orm (Patrick Wilson) as the king of Atlantis, Aquaman sired a son with Mera (Amber Heard): Arthur Jr. The half-Atlantean/Xebelian, half-human prince is heir to the throne of Atlantis and the distant descendant of Atlantis' first ruler, King Atlan (Vincent Regan) — a royal bloodline that the vengeful Black Manta (Yahya Abdul-Mateen II) seeks to end in Aquaman and the Lost Kingdom.