Mr. Krabs's arch-rival "Sheldon" Plankton is a little microbe with a big attitude problem. Owner of the rival restaurant, The Chum Bucket, Plankton's only objective in life is to steal Krabs's secret Krabby Patty recipe. Then he can steal away The Krusty Krabs's customers as well. Plankton knows nothing about preparing food and as a result The Chum Bucket's menu (consisting mostly of chum products) is horrible. Plankton rarely has a customer, but he's a nasty little fellow who never gives up. Plankton's companion is his computer wife: K.A.R.E.N. Karen tries to assist Plankton in his dastardly schemes to get the secret formula, but Plankton's ego never allows him to succeed. It kind of makes you feel sorry for the little guy, until you remember he's pure hot gas.