When SpongeBob tries to impress Sandy Cheeks at Mussel Beach, he accidentally rips his pants. SpongeBob is embarrassed until he realizes the beach crowd thought he jokingly did it on purpose. SpongeBob's ripped pants are the hit of the beach, until he pushes the joke too far.

SpongeBob falls victim to a scheme by the evil Plankton, Mr. Krabs' minuscule arch-rival with the Napoleon complex. Plankton hides out in SpongeBob's head and takes control of his brain. SpongeBob finds he must fight his own body to prevent himself from handing over the secret Krabby Patty recipe to Plankton.