Moth is the arch-nemesis that Mermaid Man was tracking down for 57 years. His only appearence was in Night Light.

The Moth is an underwater, miniature insect that wears a typical super hero suit. But unfortunately he is a villainous bug. He was attracted to all the light given off at Spongebob's house, especially the lighthouse. Spongebob trapped him inside the lighthouse, but escaped by carrying it inside the cage. He flew away, and has not appeared since. He is possibly a parody of Batman's villain Killer Moth.

He is voiced by Mark Hamill who is most famous for playing Luke Skywalker in the Star Wars original trilogy and sequel trilogy, as well as Darth Bane in the same universe, the Joker, Kavaxas, and Fire Lord Ozai.