While he sits on the throne of Atlantis, it is his goal to unite the seven kingdoms, and will do so by any means necessary — particularly because of his antagonism towards the human race.
Unfortunately for him, the big step is acquiring the King’s Trident, and recognizing the potential danger Orm represents to the surface world, Aquaman teams up with Mera (Amber Heard) to stop him.
The character will be introduced in live-action for the first time in Aquaman, played by Patrick Wilson, and when we first meet him in the story he will have a very specific mission.
Comic book fans probably perked up at the mention of Ocean Master at the end there, given that is the supervillain moniker taken on by Orm in the pages of DC Comics.