He is a big light brown monster made of mud. The mud monster has no eyes and has a single tooth.
"The Clash of Triton"
He attends King Neptune's birthday party. He was locked in a cage with King Neptune, Queen Amphitrite, the Green Sea Monster, the Purple Hag, Mr. Krabs, and Squidward by Triton. He was rescued by SpongeBob and Patrick after Patrick unlocked the cage. He returns home with Neptune and his family. His first line was "Alright, already."