The new series begins with Kurt explaining his theory of 'Ugly Men'. Kurt then suffers from a crisis as Liz begins to gossip about what happened after the Christmas party, and Lindsay opens Kurt and Brian's eyes about the gender divide.

Brian explores if drinking vodka and tonic, rather than beer, makes a difference to his urinary needs, Lindsay helps Penny understand what makes her annoying. Although Penny is trying to better herself, Liz and her are at loggerheads.

Bob sleeps in the gym and Brian has to address why his lessons are boring. Kurt can't understand Brian's problems as a parent of one of his students shows an interest in him, that is, until she smells his breath.

While Bob moves up the property ladder as he moves a bed and tv into his office, Kurt, Brian, Lindsay and Matt pull straws to see who will address his personal hygiene. Bob takes his relationship with Liz too seriously.

Lindsay struggles to come to terms with her 30th birthday, which she shares with Matt's wife. While Kurt and Brian are convinced Matt's wife is highly attractive, jealous Penny tells them she is disabled. Penny seeks her revenge with Matt.

Clare assigns the remaining staff 'stress partners'; Matt and Lindsay think they've hit gold when they have to work together. Penny is jealous and tells Kurt and Brian that Lindsay is mentally ill.

Kurt and Brian get a surprise when a face from the past returns; Simon finds himself back in the classroom. Simon makes a mistake when he helps Brian chat up the fit dinner lady.

While Simon worries about working with his replacement and wonders why everyone likes him so much, Matt steps up to the mark to fill Bob's shoes. The school has a weapons amnesty which leaves the weapons in dangerous hands.

Morale is at a low when Clare cancels the Christmas party; this is reinforced when Kurt and Brian receive a card addressed to 'Kurt and Bryony'. Simon's meddling causes massive changes and Kurt and Brian search for new best friends.

Carol's baby has an adverse effect on Clare. Bob opens up to his class and shares some of his best kept secrets. Kurt worries whether it's possible for him to be the father of Carol's baby. Lindsay struggles with mixed messages from Clare.

When a race goes wrong, Kurt finds himself with a new job and a whole new list of problems, and Brian has to face up to his responsibilities. Despite Kurt's quick discovery that he is healthy, he continues to blame Brian for everything.

Lindsay and Matt's friendship grows after a drunken kiss. Lindsay tries to put herself off Matt, by talking about his beautiful wife and listening to his tales about his 'multiple shagging disorder', but nothing works.