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. Peter goes to Great-Aunt Greta's house for the weekend, to which she is still concerned that Peter is a teenager. At first, Henry has to deliver a message to Miss Oddbod from Soggy Sid. Trouble ensures when everything gets all mixed up! In the attic, Henry is laughing when he accidentally snaps a piece on the bedpost and opens up a secret passageway, revealing a dark tunnel. As Henry goes inside, the door slams shut and he slides down the path, into Steve's room where Aunt Ruby assures Steve that there are no such things as monsters. Suddenly, the wall opens up and Henry emerges, covered in dust and cobwebs. He is unrecognizable and Aunt Ruby and Steve run away, thinking that he is a monster. Henry sees the shelves of Steve's toys and he starts to play with them then laughs as the end credits roll.

Peter is distraught when Fluffy the cat runs away. Henry is the main suspect and it's up to him to find her. Henry accidentally spills Mum's perfume on the night before her wedding anniversary, so he and Peter must make a batch before she finds out. In the episode at dinnertime, during a power cut, Aunt Ruby and Steve tell Henry the story of the ghost of the rich old man who previously owned the house. This scene isn't shown in the book, with the supposed ghost's origin not discussed. However, it is mentioned that the meal was dreadful and Steve was bragging about his expensive new clothes, toys and trainers. 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's latest prank leads to his entire class getting detention, and on the same day as an important Ashton Juniors football match!

Henry is worried that his friends Rude Ralph, Aerobic Al and Beefy Bert will see him wear pink underpants. Henry and Margaret have a competition to see whose club is better - The Purple Hand Gang or The Secret Club. 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 and Peter are tasked to keep quiet so Mum can focus. Henry is eventually motivated to keep quiet when Dad offers to buy a pizza if they remain quiet. While waiting for ballet class to start, Henry catches Miss Battle-Axe and Soggy Sid at a really embarrassing sight - Ballroom Dancing.

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Mr. Soggington makes up a 'Detention Club' on the weekend for people who need detention. It then becomes fun with a good story. Henry wants a new drone after seeing that Ralph has it and that he gets to miss school. The teachers also don't seem to know that Ralph is controlling a drone. When Mum goes out of the house, Henry takes advantage of his babysitter Mad Martin's obliviousness and watches the Gross Class Zero marathon. However, when the show comes to life within Henry and Peter's eyes, they are now on a mission with the Gross Class Zero crew to defeat the Evil Emperor - Darius Drek, and his children; Drusilla Drek and Damian Drek, and save the universe before it's too late. When Prissy Polly and Vomiting Vera come to visit, Henry ends up in a situation in having to change Vera's stinky nappy.