Bikini Bottom gets more than it bargained for when SpongeBob bares his backside at the beach! While SpongeBob's bottom is the butt of a joke, Mr. Krab's splendorous spending to secure the smooches of Mrs. Puff isn't, and he makes SpongeBob promise to help him pinch his pennies. The chaos doesn't stop as the evil Plankton schemes to steal the secret of the Krabby Patty and Mrs. Puff's prize pupil pushes his hall monitor duties onto the public at large!