As Scout swings his backpack to put the banana peel in the garbage, he knocks a kid off his bike, setting off a chain reaction that ends with a plastic squirrel the bike crashed into hitting a truck full of giant frozen tuna, which slide on the road and eat the last member of the safety patrol, "Joe Lobes" Lobenick, leaving him severely traumatized, and deleting the list of safety patrol until he recovers.

Scout also meets a kid named T'Boo, who introduces him to Lefty (who is right-handed), Red, Walt Whitman, Lucky, and Hannah Zapruder, who is one of the cheerleaders.

When Mrs. Marlowe, the principal, becomes aware that a safety patrol member is involved in the thefts, Kent, Mrs. Day, and Mr. Miller look for a scapegoat to put the blame on, and so they employ Scout as a member of the safety patrol, as Mr. Miller and Kent have a mutual disliking for him.

At a ceremony, in which Hannah is valedictorian, Kent gives a lighter and the key to Mrs. Marlowe's office to Mr. Miller and Mrs. Day, who then sneak them into Scout's pocket.

Scout, Hannah, T'Boo, and the others soon discover Mr. Miller and Mrs. Day's actual identities, mother-and-son thieves Georgina and Tim Bartlett, and that they are responsible for the thefts in the school.

Scout is put back on safety patrol, and is ultimately named captain by his personal hero John Walsh.

Grandpa Bozell makes a full recovery, though soon after is knocked out when he is sent crashing through a door by a waxer that, earlier in the film, seems to have come to life after being plugged in by Scout.