Mr. Krabs sends SpongeBob, Patrick and Squidward to dig up mustard at the Mustard Mines. The three eventually find mustard, but are confronted by an old prospector who tries to keep it for himself.

Mr. Krabs gets a craving for chum, and when the only other place in town that sells chum shuts down, he is forced to sell the secret formula to Plankton to get more.

SpongeBob is nervous about giving an oral report for boating school.

SpongeBob is obsessed with media sensation Kenny the Cat, who can hold his breath underwater for long periods of time. When Kenny visits Bikini Bottom, Sandy is skeptical. SpongeBob finds that Kenny is a fraud and uses an oxygen mask in private, but is convinced by Kenny not to tell anyone and ruin his popularity.

When the health inspector puts the Krusty Krab under quarantine, SpongeBob, Patrick, Squidward, Mr. Krabs, Pearl, and Mrs. Puff go crazy trying to figure out who has the illness.