It's April Fools Day, one of SpongeBob's favorite days of the year because he gets to play harmless pranks all day long (even if most people don't get them). Squidward decides to teach SpongeBob what a REAL April Fools joke is and gets him, but also finds out mean is not necessarily funny. Only time will reveal who has the last laugh. On a visit to the Fry Cook Hall of Fame, SpongeBob inadvertently pulls a mythical spatula from a vat of ancient grease, thus giving him claim to the title of 'Worlds Greatest Fry Cook'. When the act summons the great King of the Sea, Neptune, however, SpongeBob must face the disbelieving god in the Ultimate Cook-Off Challenge.