One of the things that director James Wan promised would be an intriguing aspect of Aquaman and the Lost Kingdom is the sub-plot involving Orm. Many remember Patrick Wilson's character as the Ocean Master who betrayed Arthur Curry and got thrown in prison. However, despite Orm working with Black Manta, Aquaman wouldn't kill his brother.
Source：https://www.cbr.com/aquaman-2-improved-thor-loki-arc-mcu/
