Follows the school activities of second-graders, Harry and Doug, as they participate in a secret mission to celebrate "Charlotte's Web, " learn how to make green slime, and put on a skit warning about the dangers of smoking.

Horrible Harry falls in love with Song Lee, and Harry's best friend, Doug, can't stand all the mush.

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

Horrible Harry, the class clown of Room 2B, returns to the spotlight with the Purple People, mysterious beings that only he can see.

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

Third grade brings lots of surprises, but one thing hasn't changed a bit—Harry and Sidney are still sworn enemies. And their relationship only gets worse when Sidney accidentally kills Harry's pet spider. But Harry comes up with a horribly funny way to get revenge during a class trip to a creepy copper mine.

Working on a dragon project in Room 3B leads to a war between two good friends--Harry and Song Lee.

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

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.

Horrible Harry must defend his reputation as a detective by cracking the secret code of Mrs. Funderburke's lunch prizes.