|First appearance:||The Clash of Triton|
|List of characters|
He is a big monster made of mud. The Mud Monster has no eyes and has a single tooth.
In "SpongeGod," he appears eating Frankfurters (hot dogs)
In "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 1st line was Alright, already.
In "Séance Shméance," he appears as a ghost at Rusty's Rib Eye.