Dennis is forced by his mum and dad to go for a haircut at Slasher Brown (Who happpens to be Walter's uncle)'s barber shop, and ends up being chased by the World Federation of Barbers.

After some trouble with Dennis, Mum and Dad join an adult education class to understand children, only to understand the tutor is a bit loopy! Meanwhile Dennis runs his own class among his friends titled "How to Understand Grown-ups".

When the Dog Training School promises Dennis's father that they can turn Gnasher into a perfect pooch, Dennis and the gang go on an undercover mission to rescue him, and discover the school is not what it seems...

It's a race against time! Dad's determined to get Dennis in the bath, but the Ministry of Defence wants Dennis left unwashed, for his smelly socks are their latest secret weapon!

When Dennis and the gang volunteer to do a days work on the SS Rustbucket on a race around the Cape of Good Hope, they find themselves swallowed alive by "Dopey Mick", the daftest whale of the 7 seas.

When the chief of the police fires Slipper for not being able to stop Dennis's trouble-making about town, it looks like it will be the end for Dennis's menacing when the post of Sergeant is replaced by a seemingly unbeatable robot! Has Dennis met his match, or will his new found friend, the loopy female inventor Flossy save the day?

When two wanted criminals see Dennis's amazing ways of making mischief, they trick him into doing his biggest blow yet...robbing the Beanotown bank!

When Gnasher is forced to stay in bed due to a toothache, Dennis cheers him up by telling him a story, but not just any old story...why just read from a book when you can mix them up and make your own special version? We see Dennis & Gnasher going on an adventure in a mystical land, meeting their friends and enemies on the way...

When aliens with the ability to disguise themselves as anything arrive on earth disguised as television sets and seeking help, Dennis and Gnasher are keen to help out, on the understanding that they can help him too, by using their disguises for menacing!

Dennis's dad is to sick to come to work, so Dennis hands in a sick note to find out what Dad's work life is like...only due to a mix-up Dennis & Gnasher find themselves instead at the Secret Agency next door where they are mistaken for Dirk Cool, a secret agent who is a master of disguise dressed as a 10 year old boy and his dog. Next thing the duo know, they are being fired of in a space pod on a mission to stop a crazy dinner lady turn the whole world into 10 year olds unless they eat her rotten dinners! Can Dennis and Gnasher save the day?

Hiding from the wrath of Dad after a chaotic morning (aided by Granny), Dennis comes across what he thinks is his Dad's diary, and realises that in his youth he was far from the respectable young man he claimed to be. Soon, the diary entries make Dad a reluctant celebrity, and with a Hollywood film director making a film based on the book, Dennis discovers that his antics are no longer seen as threatening.

When The Colonel organises an outward bound weekend in the woods, Dennis and Gnasher decide to tag along and cause mayhem for a laugh, but things are not longer a joke when they learn that Genghis Kong, an escaped circus gorilla, is on the loose in the woods and has somehow taken an interest to Dennis's granny.

Eccentric millionaire Sir Fitz-Patrick Flush promises to give a million pound cheque to the citizens of Beanotown if they can live without television for a whole week. Unfortunately, this doesn't go down well with Dennis and pal's plans to watch the week-long marathon of their favourite show Nick Kelly.