Chrissy and Jo throw a farewell party for their flatmate, who's getting engaged and moving out. Next morning, they find Robin asleep in their bath. They're looking for a new flatmate and he is looking for somewhere to live, so the girls ask him to stay, but will their landlords, the Ropers, agree to the new arrangement ?

Chrissy is very nervous when Jo goes away for the weekend and leaves her alone in the flat with Robin. He brings a woman back, but Chrissy becomes jealous...

Chrissy's mother is about to pay a visit. She doesn't know Robin is living in the flat, so he's told to make himself scarce, but as she's staying the night, where will he sleep ?

Jo's new boyfriend is coming to the flat for a meal. Robin is persuaded to cook, then leave with Chrissy to spend the evening playing monopoly with the Ropers. They learn that Jo's boyfriend is Jewish - and Robin has cooked roast pork for their meal!

The rent is due and the money put aside to pay it has disappeared from the flat. Robin, Chrissy and Jo have to find a way of getting some cash quickly.

Robin acquires a puppy. The lease on the flat says 'no pets', so Roper mustn't find out.

Robin has been picked to play in a college football match. A few days before the game, he goes down with a bad cold. Chrissy and Jo rally round in an attempt to help him to recover in time to play.