Bikini Bottom gets more than it bargained for when SpongeBob bears his backside at the beach! While SpongeBob's bottom is the butt of a joke, Mr. Krab's splendorous spending spree to secure the smooches of Mrs. Puff is not--and he makes SpongeBob promise to help him pinch his pennies. Later, when it's SpongeBob's turn to be the school hall monitor, he overextends his undersea duties...to the public at large! The marine mayhem doesn't stop there: The evil Plankton schemes to steal the secret of the Krabby Patty!