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?

Peter has had enough of Henry's horridness.

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.

Henry proves the director of the movie that his friends have the talent to be in the movie.

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...

Mum's Biscuits are a big hit with Henry, and he's determined to know what the secret recipe is.

Mum wants Henry to not be horrid for a week.

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.

Henry and Dad think that going fishing is better than going shopping.

Henry goes to a Secret Club sleepover at Margaret's house.

Fang is challenged by a Boodle Poodle.

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.

Dad decides to get Henry a Saturday Job cleaning up the Park.

Henry is forced to be in The Happiest Family Contest until he hears that the grand prize is an island getaway.

Great-Aunt Greta babysits Peter and Henry while their parents are out for the weekend. However, Henry is up to something great and horrible.

Henry goes to work with Pimply Paul delivering the milk.

Henry has been brought face-to-face with Margaret.

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

Henry saves Miss Oddbod's Cat, but Peter takes the credit.

When Henry's Dad gets a new job across the country, Henry's family has to move away from Ashton.

Henry and Steve have a plane battle.

Henry and Margaret start a fashion show to sell Henry's old clothes.

Henry's latest prank leads to his entire class getting detention, and on the same day as an important Ashton Juniors football match!