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The Brown family move to their new home after having to leave their last one because Stanley used it for one of his disgusting experiments. He's promised his mum that there will be no more exploding bogey balls, slug discos or any other revolting experiments but as the new neighbours arrive, there is a rather nasty surprise in store.
Stanley and Steph lock horns as they both want a lift from mum to go out but she cannot take them both. A plate of egg sandwiches proves to be his unlikely saviour.
Mike has an accident while testing Stanley's new invention, the 'Dizzybuster'. Stanley is forced to take Mike's place and become a junior marine; all is fine until General Crawford turns up to put Stanley through his paces. Mum's bad breath and a big juicy pimple help save the day.
Stanley is making the most revolting film ever, but first, he must find a leading lady. Daisy turns out to have unexpected talents although it soon becomes obvious that she isn't actually acting. Steph thinks she should be the leading lady and will stop at nothing to get the part, as far as she's concerned since when has lack of acting ability talent ever been a problem?
Stanley's things keep going missing, but who is the thief? It gets worse when Jess' tarantula also goes missing. The pressure's on to find the culprit and save Jess' spider before Stanley's mum spots it. A ghostly sleepover uncovers the culprit.
Archie is worried Stanley seems to have lost his mojo - he's stopped coming up with revolting experiments! Archie panics and tells a little white lie, resulting in Stanley no longer sleeping, eating and worse of all washing! Meanwhile, Stanley's sister Steph ditches best mate Daisy and starts dressing like a scientist to impress heartthrob Daniel... but Daisy won't be dropped that easily.
Jess is in serious trouble. Stanley and Mike want to help but Jess won't tell them what she's done. Things get more mysterious when she and Steph start becoming best buddies. Mum's arranged a dinner party and Stanley has to make sure it happens without a hitch but why are Jess and Steph so intent on ruining it? Stanley doesn't know what's going on but all he knows is that he's got make sure the dinner party goes ahead!
It's a battle of the scabs - Stanley verses arch-rival Geekboy2000. Stanley needs only one more gruesome scab to finish his ultimate collection and beat his rival to the honour of the best scab collection ever. The only trouble is the scab in question is attached to his sister Steph's arm! Stanley has just one day to retrieve it - the scab hunt is on!
Stanley's mum is launching her new aftershave, 'Demolition - for Men' and she wants everything to be perfect. She gives Stanley a stern warning that nothing can go wrong but Stanley has other things on his mind - he fears his beloved shed is about to be knocked down! As the 'Demolition' men arrive, Stanley, Jess and Mike get prepared for battle and defend the shed!
Love is in the air for Stanley and Mike when a mysterious girl turns up and distracts them from his new exploding volcano invention... but who is she and why has she appeared now? With Stanley and Mike's attention diverted, it is left to Jess to solve the mystery.
Archie keeps ruining Stanley's revolting experiments and something needs to be done about it. When eccentric Aunty Amy, just back from the jungle, makes a surprise visit, Stanley thinks he may have found his solution. At the same time, Steph is trying to impress the most popular girl at school but for once has to turn to Stanley for help... who knew that his earwax could be so useful!
Stanley's neighbour, Jess, claims that she can burp the loudest. Not one to be out-done, Stanley builds a machine (the 'Juicinator') to help him create the loudest burp ever. His plans are interrupted when local news reporter Sarah Stripe arrives looking for 'local hero' Mike.
Archie travels back to the future to graduate from school but must first convince the mysterious headmaster that he has given up time travelling. This is a clip show which looks back on the series.
