Mr Church and Miss Postern are sharing the chemistry lab.
Mr Barber has been sleeping at school, Ms Baron is putting a stop to it.
Mr Martin and Miss Postern show Dean how to channel his anger... using rap.
Mr Church gives his class a very special chemistry lesson.
Ms Baron calls the teachers together to discuss parents' evening.
From Series 2, Episode 3. Featuring: David Walliams (Mr Church), Catherine Tate (Miss Postern), Philip Glenister (Mr Gunn), Frances de la Tour (Ms Baron), Joanna Scanlan (Mrs Klebb), Daniel Rigby (Mr Martin).