After Perfect Peter loses a tooth and earns a pound from the Tooth Fairy, Horrid Henry grows extremely jealous over the fact that everyone he knows except him has lost a tooth. He decides to trick the Tooth Fairy into giving him a pound. Will he be successful?

It's another ordinary day for Horrid Henry, until he notices one thing: Mr. Kill is missing. Using his detective skills, Henry looks around his house and interrogates people who supposedly have the need for revenge against Henry for all of the bad deeds Henry has committed to them. With no progress, Henry decides to talk with the one person who could possibly have a good revenge against him: Perfect Peter.

Stuck-Up Steve tricks Henry into thinking the attic in his mansion is haunted.

All of the children are collecting Gizmos out of cereal boxes. Gizmos come in different colours. The rarest on e is gold. For a while, none of the children have a gold Gizmo, but eventually, Perfect Peter gets one, and Horrid Henry tries everything he can to get his hands on it...

Henry imagines if his parents were Perfect, but soon regrets it.

When Stuck-Up Steve comes to stay for Christmas, Horrid Henry decides to make sure Santa Claus gives him the right presents...

Henry wants to ask the Queen his lifetime question, but Peter is personally chosen to meet her. Much hilarity ensues with only a slight hint of anti-royalism.

Miss Battle-Axe is acting very weird and Henry and his classmates see if Miss B has been controlled by an evil mastermind.

After not being allowed to go to the funfair for a bad report card at school, Henry decides to be perfect like Peter for a day.

Henry borrows Ralph's phone and it gets confiscated.

Rude Ralph is missing, and Henry is desperate to find out where he's gone.

Henry isn't impressed that it's his birthday again.

A competition between Peter and Henry happens when Henry becomes a recycling ambassador.

Horrid Henry hates sports day. He never wins at a single event. So he is not happy when sports day arrives, and he must compete. However, there is a way for him to win this year, and that is if he cheats...

Henry puts Peter's favourite rabbit toy, Bunny, in the school's time capsule after not being allowed to put his slime in. Henry's now on a mission to retrieve Bunny or his pocket money is history but when he trashes the school gardens his dad tells him he will be having no pocket money for a long time.

Henry cheats on a computer test, and now everyone wants his computer knowledge.

Henry completes a difficult quiz to win Gross Class Zero tickets.

Peter encourages Henry to rewrite the Purple Hand Gang rules to make everyone happy.

Henry gets a Gross Class Zero cushion.

It's Halloween and Horrid Henry prepares to go out trick or treating with Mum and Perfect Peter, who is dressed up as a bunny rabbit. Henry cuts his hair to make him scary and Mum grounds him. However, Henry has a plan; he tricks his Dad and sneaks out into the night, scaring kids from his school and stealing their treats. But the real challenge is Moody Margaret.

After spending some time eating school dinners, Horrid Henry is happy to be going back to having Packed Lunches for dinner time at school. But when he goes back to the Packed Lunch room for the first time in a while, he meets his new enemy - Greasy Greta, the Demon Dinner Lady. She uses the rule of 'No Sweets In School', by eating any sweets the children brought in their packed lunches. The only way to stop her is by playing her at her own game...

Henry must face his worst nightmare: injection day.

Margaret tags along with Henry, Peter and Dad on a trip to the aquarium.

A Math test is coming up, and Henry doesn't know what to do.

Horrid Henry has always had a way of sending any babysitters trying to look after him refuse to look after him again. But when Rabid Rebecca, the toughest teen in town, who every child is afraid of, comes to babysit him, it seems Henry has finally met his match.Henry discovers that his usual tactics just don't work, and he's forced to be even more inventive by teaming up with his brother Perfect Peter.