This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Henry learns that data can be dangerous when Peter becomes Chief Secretary of the Purple Hand Gang. Henry is forced to be in The Happiest Family Contest until he hears that the grand prize is an island getaway. In the book, the attic has pink and blue flowered wallpaper and carpet. In the episode, it is undecorated, with wooden support beams and no carpet. Peter has had enough of Henry, so he plots his revenge on him by sending Moody Margaret a love letter.

NOTE: This episode takes place during the events of Horrid Henry and the Terrific Teenager, Horrid Henry and the Measly Mascot and Horrid Henry: The Great Escape, except focusing on Henry. Henry cheats his way through a book-reading contest to win a prize, but it isn't what he hoped for. Henry is worried that his friends Rude Ralph, Aerobic Al and Beefy Bert will see him wear pink underpants. NOTE: This episode takes place during the events of Horrid Henry Wins the Cup, Horrid Henry: The Great Escape and Horrid Henry and the Measly Mascot, except focusing on Peter and in some cases, Fang and Fluffy at home.Henry completes a challenge and a part of it includes being horrid. This may not sound anything like breakfasts, but it will become clear when it comes to the show! NOTE: This episode takes place during the events of Horrid Henry Wins the Cup, Horrid Henry Reads a book, Horrid Henry and the Terrific Teenager and Horrid Henry: The Great Escape, except focusing on Henry with Peter narrating the majority of the episode. Margaret unveils her multiple YouGroove channels, one of which is poking fun at Henry. He then tries to convince Margaret to take them down. Henry's idea of what a job is like isn't right to him. Bossy Bill, the son of Henry's dad's boss, Bossy Bob, keeps getting him in trouble.

Henry and Peter go with Prissy Polly, Pimply Paul and Vomiting Vera to see The Happy Hippos movie in the Cinema.

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The new dinner lady is stealing treats from everyone's lunchboxes and Henry must stop her from ruining his lunch. Mr. Soggington makes up a 'Detention Club' on the weekend for people who need detention. It then becomes fun with a good story. Henry's weekend gets in grave danger when Moody Margaret stays at his house while her parents go on holiday.