Emnu was a member of the Watchers. He opposed Ikor's plan to share their scientific knowledge with other races, but was outvoted when Ikor's son Uatu voted against him.^[1]

After the Prosilicans, a race to whom the Watchers had given knowledge of advanced technology, began to conquer the universe, Emnu created the Ultimate Nullifier to destroy them. However, its firing also destroyed nine tenths of the universe.^[2]

As a member of the Watcher species, he possesses all the powers of his species.