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.

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Mum accidentally throws away an object Henry is sure that gives good luck.

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Sharing is something that Henry and Peter dislike doing, but is there anything they can do about it?

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A magic wand can do anything, which Henry and his friends aren't suspecting.

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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.

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Henry loans a 3D printer from Brian, and they become inventors.

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Henry runs for School Council, but finds an unsuspecting rival along the way.

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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.

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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.

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Henry is told about a pet show that he is not interested in. However, Fang wants to participate.

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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.

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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.

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Henry sees what the world would be like if he didn’t age. He finds some unexpected paths in the student’s lives.

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Henry has to be good to get a special treat.

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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.

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Henry gets stunned when he thinks that Peter can read his mind.

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Margaret demands Ralph to make his own club.

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Henry creates a new delivery service.

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Mum and Dad go to Henry's Parents Evening, but find a nasty surprise along the way.

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Mum and Dad go out to Peter's Parents Evening, but find themselves talking about Henry instead.

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Margaret introduces Henry to the art of "Girl Talk".

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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.

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Henry's life stories are stolen by an author, so he takes revenge.

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Henry has a rival on his hands in the form of Perfect Peter, who wants to be horrid.

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Henry learns how to play the cello, and Peter reveals that he has been practising air guitar in secret.

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Henry makes up a new improved version of a popular game, but not the way he wanted.

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Margaret unveils her multiple YouGroove channels, one of which is poking fun at Henry. He then tries to convince Margaret to take them down.

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Peter's new Sat-Nav takes the family on a crazy road trip.

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Are the birds sitting near the Purple Hand Fort a source of good luck or bad luck?

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Henry rewrites membership rules for the Purple Hand Gang, but gets more than he bargained for.

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Mum books a dentist after a prank call caused by Margaret.

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Henry sits on a worm that he couldn't see, so he gets into an inescapable situation.

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Henry has a dream where he gets a clone of himself.

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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.

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Margaret plans to build an improved Secret Club Treehouse.

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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.

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Henry attends Moody Margaret's sleepover.

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Henry creates a hotel at his house and gains an unsuspected visitor.

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Henry goes off to the Brainbox of the Year competition.

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Mum and Dad go for a romantic weekend out of town, but it is not the kind they wanted.

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Peter goes to Great-Aunt Greta's house for the weekend, to which she is still concerned that Peter is a teenager.

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Peter narrates Henry's trip to the "Brain Box of the Year" competition.

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