oceam master was aquaman's fully human half-brother, the son of tom curry (aquaman's father) and a woman named mary o'sullivan. he becomes a villain because he grows jealous of aquaman and how he becomes king of atlantis. ocean master is full human. he later has amnesia and disappears. several years later, the self-named orm marius reappeared as the ocean master, a high-tech pirate who initially attacked ships but quickly moved on to causing natural disasters in order to hold the world at ransom.