S4·E39 From Hartley High to Hartley Heights (Season finale)

Les is appalled at the school's state of disrepair and demands that the Department takes action. He is shocked however, when instead of renovating, they decide to close Hartley High. Les finds himself without a school and without a job. But most distressing for him is the lack of any regret from his students. All students are moved to Hartley Heights, a neighbouring school. They all react in a different way. Mel tries to find an old student who's life has been changed by Hartley High. Draz and Ryan embitter Bailey's life because they need no longer to be afraid for punishment or suspension. They play a practical joke on Les by staging an accident. Les panics and calls an ambulance, but is furious to find that he has been tricked. He threatens to punish them but they laugh in his face — what can he do... he isn't their principal anymore. However, Les does have the last laugh.