Patrick recruits SpongeBob into his club, the Empty Head Society. Before entering, SpongeBob is made to remove his brain and hand it in to check-out; however, while doing destructive “community service” with the group, his brainstem shorts out and severely lowers his intelligence. Patrick helps SpongeBob find his brain again.

Mr. Krabs sneaks away from the Krusty Krab’s annual health check-up, fearing that it will be painful. SpongeBob and Squidward try to give him the check-up without him knowing, and when their attempts do not work, they make Larry the Lobster dress as Mr. Krabs and pass the check-up.

Goo Goo Gas: Plankton plans on making Mr. Krabs helpless by turning him and the rest of the Krusty Krab staff into babies with a gas he created.

Squidward’s clarinet disappears, so he, SpongeBob, and Patrick investigate suspects. The clarinet is revealed to have been stolen by jellyfish, who enjoy Squidward’s music and let him play in their club.