Henry starts a service that claims to get homework completed. Henry calls on Peter when he ends up with more homework than he initially expected.
Mum accidentally throws away an object Henry is sure that gives good luck.
Sharing is something that Henry and Peter dislike doing, but is there anything they can do about it?
A magic wand can do anything, which Henry and his friends aren't suspecting.
Henry fakes being sick to take the day off school, but Dad lets him stay home. A flatscreen television arrives the same day, and Henry and Dad try to set it up.
Henry loans a 3D printer from Brian, and they become inventors.
Henry runs for School Council, but finds an unsuspecting rival along the way.
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.
Mum starts a system for keeping track of Henry and Peter's behaviour, and Henry is persuaded to be good so he can win tickets to a movie.
Henry is told about a pet show that he is not interested in. However, Fang wants to participate.
Fang goes off to retrieve Henry's snotslimer after it is taken off of him. Fang also finds a cult-like group of hamsters that ran away.
Sweets are being handed out to pupils at school and Henry wants to get one. Henry also has to get given an injection that has a very low chance of being given to a pupil.
Henry sees what the world would be like if he didn’t age. He finds some unexpected paths in the student’s lives.
Henry has to be good to get a special treat.
Henry tricks Peter into convincing him that he has found a planet through his telescope. Peter does not know that the supposed planet is actually a grape.
Henry gets stunned when he thinks that Peter can read his mind.
Margaret demands Ralph to make his own club.
Henry creates a new delivery service.
Mum and Dad go to Henry's Parents Evening, but find a nasty surprise along the way.
Mum and Dad go out to Peter's Parents Evening, but find themselves talking about Henry instead.
Margaret introduces Henry to the art of "Girl Talk".
Henry finds a false family tree chart, that was made to fool Henry’s dad, that claims he is a descendant of King Henry VIII.
Henry's life stories are stolen by an author, so he takes revenge.
Henry has a rival on his hands in the form of Perfect Peter, who wants to be horrid.
Henry learns how to play the cello, and Peter reveals that he has been practising air guitar in secret.
Henry makes up a new improved version of a popular game, but not the way he wanted.
Margaret unveils her multiple YouGroove channels, one of which is poking fun at Henry. He then tries to convince Margaret to take them down.
Peter's new Sat-Nav takes the family on a crazy road trip.
Are the birds sitting near the Purple Hand Fort a source of good luck or bad luck?
Henry rewrites membership rules for the Purple Hand Gang, but gets more than he bargained for.
Mum books a dentist after a prank call caused by Margaret.
Henry sits on a worm that he couldn't see, so he gets into an inescapable situation.
Henry has a dream where he gets a clone of himself.
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.
Margaret plans to build an improved Secret Club Treehouse.
Soggy Sid finds himself in the middle of a crime at the bank, and finds what seems to be a piece of Henry's shirt, so he suspects that Henry is behind it.
Henry attends Moody Margaret's sleepover.
Henry creates a hotel at his house and gains an unsuspected visitor.
Henry goes off to the Brainbox of the Year competition.
Mum and Dad go for a romantic weekend out of town, but it is not the kind they wanted.
Peter goes to Great-Aunt Greta's house for the weekend, to which she is still concerned that Peter is a teenager.
Peter narrates Henry's trip to the "Brain Box of the Year" competition.