Arthur’s brother
When Atlanna returned to the ocean, she married the man she was supposed to and had a son, Orm (Patrick Wilson). Orm despises his older half-brother, whom he has never met, and begins a plan to unite all the kingdoms of the sea to take over the surface. It’s this development that finally brings Arthur back to Atlantis.
The two fight and—after proving he’s the true heir to the throne—Arthur triumphs and Orm is arrested.
