It's World Book Day and the Dockbridge High staff are very excited about showing off their costumes. Mrs Mark, Mr Capp, and Joy all share their favourite books whilst Mr Christopher celebrates the greatest book of all time - his autobiography!

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.