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

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

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

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.

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

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

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.

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

Henry attends Moody Margaret's sleepover.

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

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

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

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.

Margaret demands Ralph to make his own club.

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 goes off to the Brainbox of the Year competition.

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

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.

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

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

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

It's Be Nice to Your Brother Day and Henry's got the chance to win a Class Zero game if he can be nice to Peter all day.