Harry persuades his classmates to sneak through the playground fence during lunchtime recess to view some unusual mushrooms.

Nearly every kid in Room 3B is trying to get picked for the South School Safety Patrol Squad--especially Harry. Harry wants a star badge just like his grandpa's, so he works extra hard to be the perfect student: hanging up his jacket neatly, organizing the crayons in rainbow order, and--his favorite part--cleaning up sticky noodles off the floor after lunch. But Doug thinks someone is taking the power of Safety Patrol too far, maybe even using it...

Horrible Harry of classroom 2B cuts back on his mischievous pranks after falling for Song Lee.

As Valentine's Day approaches, the students in Room 2B are preoccupied with kickball and a possible wedding between Horrible Harry and Song Lee.

When their teacher ends up in the hospital, the members of class 2B find a way to include her in their holiday celebration.

Inspired by his third-grade class's study of the moon, Harry announces that he is going there.

The students in Miss Mackle's third-grade class enjoy a day of Halloween surprises, including Harry's unusual costume.

Horrible Harry and Song Lee have been best friends since kindergarten. But when they have to work together on a project about dragons, they get into a fight that threatens to end their friendship.

When Horrible Harry's pet cat, Googer, sneaks a ride and gets into the school building, third-graders Harry and Doug have to catch him before anyone else does, which means going into some forbidden places.

Room 3B just learned that Ida had an ancestor who sailed on the Titanic and lived to tell about it! Miss Mackle decides that she will take the class on a real riverboat trip. But has something gone wrong.