Old Bluelip is supposedly a deadly, blue-lipped giant clam. He first appears in the episode "Clams, in which he is the main antagonist. He also appears in the book Who's Hungry?
Old Bluelip looks similar to all of the other clams in the series. He is a giant, light purple clam with blue lips and a large, pink tongue.
Role in episode
SpongeBob, Squidward, and Mr. Krabs are fishing for clams. SpongeBob accidentally rips Mr. Krabs' one millionth dollar off of his pants and throws it in the lagoon. Old Bluelip then tries to swallow the dollar, but SpongeBob manages to reel it in. However, he jumps up and takes the dollar out of Mr. Krabs' hand.
He appears again at the end of the episode when Mr. Krabs jumps in his mouth to get the dollar. However, Old Bluelip takes Mr. Krabs, and SpongeBob and Squidward think that he got eaten, but it actually turns out that only the lower part of Mr. Krabs' body got eaten so he could get the dollar back.
This character, along with the whole episode, is a reference to the Great White Sharks in the Jaws franchise.
His surname is based on the fact that he is a blue-lipped clam.