Patrick keeps a small box everywhere he goes, and refuses to tell SpongeBob what's in it. Curiosity eventually gets the better of our spongy hero, as he decides to try and sneak a peek while Patrick is sleeping. Squidward enlists the aid of SpongeBob and the rest of Bikini Bottom to form a marching band to impress Squidward's old high school rival, Squilliam Fancyson.