There's a leak in the roof above Hilary Head's office so she forces the whole school to get involved in raising money to fix it. Mr Christopher releases a charity single and Mark chooses to do a sponsored silence but finds it harder than expected when Billy embarrasses him in front of Marcella.

The last day of the school year is here at last and it's prom time! Mark finally plucks up the courage to ask Marcella out and Mr Christopher puts his reputation on the line when he tries to prove once and for all that he's the most talented person at Dockbridge High.