Mr Malachay introduces a rota for pupils needing the toilets, while everyone starts to tire of the smell. Abel is banned from going round to Togger's after school as his coursework is suffering. Andy turns up sporting a moustache, which Togger and Abel are quick to ridicule. Martin realises he was wrong to humiliate Maddie. When she tries worming her way back into his good books, he ticks her off for messing with his head. She slips back to her old ways and refers to Martin as "the Asperger's kid", to everyone's astonishment. Holly realises Maddie is only being friendly with her because she's lost Martin - and wastes no time cutting Maddie down to size.

The school is setting up an Indonesian exchange. Emma tries in vain to drum up interest. She gets chatting to Andy, who reveals he's sick of being put down by Togger. Emma seems more understanding about his moustache. Togger realises the boy's loos stink more than the girls - so he changes the signs around! Malachay coerces Dawn and Kat into doing a DVD about the CLC, ignoring their very clear "no". They come up with a better idea for the enterprise competition - producing wedding videos. Martin's idea evolves into energy renewal. Malachay suggests he sell the idea on Radio Grange Hill, but during the interview he goes off on a tangent and upsets Emma, who walks out. Mr Fox isn't impressed when Martin skips his lesson to work on the project.

Alison gets her own remote-control car. Mooey tries to bait her but Alex scares him off by showing him Alison's eczema. Alison is really upset by this. Alex gets the blame when Mrs Bassinger confiscates their cars. Alex seeks advice from Togger on how to make things right with Alison; when confronted by Mooey for a second time, Alex refuses to parade Alison's scars as directed. He tells her he values their friendship more.

Andy goes into the girls' loos by mistake. He overhears Emma telling Kathy his moustache looks stupid. Holly walks into the path of a reversing dustcart on her way home. Baz leaps to her rescue just in time; after an initial tender moment, things sour when Baz asks for another chance.