Brotherly Love

To help defeat the newly superpowered Black Manta, Arthur recruits his former adversary, and brother, Orm, played by Patrick Wilson. And again, that was the plan from the first film.
“The plan was always going to be that Patrick’s character was going to switch,” Wan said. “I knew that from the get-go in this film. That’s why I didn’t want to kill him at the end of the first movie. He was going to ultimately be like somewhat of a pseudo-antihero in this one. And I wanted to see just the relationship between Jason and Patrick.”