He has the appearance of a giant, mutant, one-eyed monster, with a long enormous tail. He is lime green with a giant light green stomach and light purple lips.
Role in series
"20,000 Patties Under the Sea"
When SpongeBob and Patrick fall into the abyss with the mobile Krusty Krab, they fall on top of the sea monster at the bottom. The monster says that he has been asleep for 79 years, and as a result, he is hungry. He buys a lot of Krabby Patties and gives SpongeBob and Patrick a ridiculous amount of money. Plankton tries to destroy the mobile Krusty Krab, but his chum charges only end up helping the two, as the sea monster likes Chum Patties even more.
Plankton tries to tell the monster that they stole his idea, but he falls on the ground and is covered in mud. The monster thinks he is a chocolate eclair and chases him.
"The Legend of SpongeBob"
SpongeBob throws a spatula into the sea monster's eye, making him cry.