To everyone's surprise, not least Nathan who was hoping to impress him, Byron has been replaced by the dynamic Mr Bell, who promptly announces that the school is to become an academy.

Nathan finally decides to ask Miss Poppy out, but it's on the day that Mr Bell is to select a head of year and Josh is determined that Nathan gets the post instead of Thorne.

A heartbroken Nathan leaves Elmsbury to take up a post in Scotland, so Dexter enthusiastically steps up to run the 4 O'Clock Club. But when Josh discovers that Dexter is also his mum's new lodger, he makes it his mission to take Dexter down.

Bell initiates a big clamp-down on security and truancy in school, meaning no more visits to the ice cream van just outside the front gates. But worse for Josh, there's a game he wants to buy in a shop that is shut out of school hours.

Bell has organised a tour of the school by visiting headteachers, including Dexter's dad. But Dexter has exaggerated his role at the school and has to get Josh's help to maintain his lie.

Bell starts a scheme where good behaviour is rewarded with points that can be converted into prizes. Josh realises that with enough points he can buy his dream tablet.

Josh needs Dexter's help to finish off some new tracks, but doesn't want to look uncool by hanging out with a teacher. But Dexter has other ideas and plans to take this beautiful new musical partnership public.

Dexter takes the 4 O'Clock regulars on a half-term camping trip. But due to a mix-up they have to turn back and head home. To salvage something from the trip, Josh comes up with a bold idea for where they can camp instead.

Josh is suspended for a day. Unfortunately it's on school careers day, and a record label guy Josh is keen to impress will be there. Can Josh get in to meet him without getting caught?

Bell brings out a new code of conduct outlining the rights and responsibilities of each pupil. Dexter encourages the 4 O'Clockers to make a film about the new scheme. But Josh has other ideas and wants to use the camera to shoot his new rap video.

Josh has written his best track ever and decides he is going to sell CDs of it in school. But when he realises he has sampled a famous track without permission, he has to get all the CDs back before he is caught.

When Dexter enforces the no-phones rule in the 4 O'Clock Club, Josh rebels and decides to test once and for all just who is in charge in detentions, the teachers or the pupils.

Dexter finds himself fronting Bell's new plan for Elmsbury - Project Zenith. But the plan has big, bad implications for the 4 O'Clock Club. Josh sets out to defeat the scheme, with a little help from his friends and family.