He is a lime-green sea monster who appears to resemble a large sea serpent, and has very sharp teeth along with red eyes and lighter green-shaded scales along its body.
Role in episode
The Loch Ness Monster is a legendary monster who lurks in the rivers of Scotland. SpongeBob and Patrick are told to find him by Squidward. The monster dislikes bagpipe music, but he loves to eat them.
SpongeBob and Patrick later bring it home to Squidward and it eats him.