It's parents' evening, and Alfie is under pressure from deputy headmistress Miss Pickwell to mark his mock exam papers, or she will fail his whole class.
Parents are worried about the impending arrival of the French exchange students, but this time Fraser is determined to prove that he has got everything under control.
A new computer game craze hits Abbey Grove School. Fraser buys a copy to see what all the fuss is about but inadvertently turns his staff into addicts.
It is the day of the Abbey Grove school field trips, and Alfie and Miss Gulliver escort their pupils to a petting zoo and ink museum, but things don't go as planned.
It is the biggest football match of the year as Abbey Grove take on the local public school. Unfortunately, Alfie has to step in and coach the Abbey Grove team.
It is school election time and Gulliver implies Alfie's class are all 'unelectable'. Pickwell has her sights on Fraser's job after he is suspended.
Abbey Grove's new term kicks off with the annual swimming gala, and Alfie bribes his class to take part with the promise of a trip to a restaurant.
Alfie is shocked by the arrival of new teacher Mr Schwimer at Abbey Grove and even more shocked to learn that he will be taking over Alfie's class.
Alfie is wracked with guilt when Miss Pickwell's suicide note lays the finger of blame on him after one of his class's pranks pushes her over the edge.
It is Valentine's Day and headmaster Mr Fraser has planned a special Abbey Grove Take Me Out to help the shy kids find love.
Mr Fraser organises a guest speaker for Drugs Awareness Day to Miss Gulliver's annoyance. Can Alfie persuade Stephen's parents to let him stay in school?
When Abbey Grove is plunged into financial ruin, can Alfie come up with a plan to save it? And can he also stop Miss Gulliver from leaving?
It is time for the Abbey Grove Christmas play, and with Miss Pickwell no longer around, Mr Fraser decides Alfie is the obvious replacement to direct.
Alfie must stand by his girlfriend Miss Gulliver when she leads the teachers on strike or sacrifice himself to save his class from failing their exams.
Will Alfie be able to attend Gulliver's book group, Fraser's LARPing club and Mitchell's leaving party all at the same time?
It is Abbey Grove's sports day and Fraser has hired the most inappropriate new sports teacher to oversee events - Preet.
When Martin and Alfie accidentally run over the school caretaker, Alfie and his class start fundraising for the caretaker's urgent surgery.
Fraser discovers that Alfie never passed his biology GCSE, so Alfie must be taught by Gulliver and sit the exam with his own class.
It is careers advice day for Form K, but Alfie makes a big decision when he realises he cannot go on teaching without his beloved class and quits.
Class K are back for a careers day and a reunion that descends into mayhem. Meanwhile, Alfie has a decision to make – will he finally leave the school forever to be with Gulliver?
Stephen and Mitchell are told one of them will be fired so go to extreme lengths to save their jobs. Meanwhile, Fraser has accidentally started printing the entire internet.
Stephen is determined to find out who snitched on him about Class K’s trip to a drag brunch. Meanwhile, Fraser mistakes an Ofsted inspector for a Task Rabbit.
Hoburn tries a prison experience programme at the school to teach the kids discipline. Class K end up incarcerated with Stephen, who’s prepping an audition as a hardened criminal.
After Class K make Stephen feel old and irrelevant on his birthday, he goes to ridiculous lengths to prove he is still a trailblazer.
Stephen is desperate to get rid of Mitchell, who has moved in after his girlfriend threw him out. So Class K and Stephen give Mitchell a glow-up in the hope she will take him back.
Stephen wants to turn the school play into a showcase for his talents to impress an agent, but Hoburn has more sinister plans to use it as a way of closing the school down.
With the help of ghostly friends past, present and future, Stephen makes an important decision about his career at Abbey Grove. Mitchell takes his Die Hard obsession to the limit.
After spending their life savings on a wedding venue mix-up, Mitchell risks losing Kayleigh. Class K come to the rescue, promoting a boxing match at Abbey Grove with dramatic consequences for Warren.
When Mitchell gets a bit part in a gangster film, it goes to his head. Swayed by the hype, Hoburn instructs him and Stephen to swap jobs - but with the school drama competition looming, Class K aren't keen on the changes.
Hoburn enlists fitness guru Mo Dix to get the school back in shape. While Class K protest under Mo's regime, Stephen falls for him, going to great lengths to get rid of Mitchell so Mo can replace him as the new PE teacher.
The recovery of Stephen and Mitchell’s old time capsule prompts an overnight break-in and some ghostly encounters and revelations for Class K. Hoburn is desperate to keep the identity of the new art teacher a secret.
When Jinx abandons her studies to spend more time with Mitchell, Class K struggle with their exam prep and ask Fraser to help, leading to an unusual interpretation of Pygmalion - involving an actual pig.
Class K's camping trip spirals into chaos after Mitchell takes his pranks a step too far. Stephen goes missing when he encounters an old drama school rival. Warren reveals he has a secret crush on someone.
Mr Wickers and his class go on one final school trip after they finish their GCSEs.
