The opening episode of the series, "Fitting Punishment", re-introduces five of the main characters, with the exception of Janey, played by Daniela Denby-Ashe.

They both then get Roger, who allegedly dances "like Fred Astaire", to teach them privately so they can enter a competition at the end of the month.

They are plagued by a group of children (Dani Harmer, Tony Bignell and Hannah Bridges) doing trick or treating, and strange things begin to happen.

Ben also upsets the people in the next house (Henrieta Baines, Christopher Ryan and Cressida Whyte) by accidentally taking indecent photos with his new digital camera.

Roger goes to the Harpers saying that one of his patients had got an infectious disease from Peru called "Ortiz River Fever", so Susan puts the whole house under quarantine.

Meanwhile, Ben manages to escape the house, meets a man called Clarence (Leslie Randall) and then has an epiphany where he does not exist.

Ben, Susan, Nick and Michael are on the tube after doing some Christmas shopping, and due to signalling problems the train cannot move.

Michael gets a girlfriend called Claire (Sydney Stevenson), Nick makes money by selling bottled water and Susan starts decorating the carriage.

Abi, Roger, and an Albanian man (Samuel Gough) are busking as a Romanian folk band, while Nick brings Richard Whiteley to see Ben and Susan.