The morning after a party, Chrissy and Jo find Robin asleep in their bath and ask him to become their third roommate.
Chrissy tries to hide the fact that Robin has moved in when her mother visits.
Robin cooks a pork meal for Jo and her date, not realizing the dinner guest is Jewish.
With Jo gone for the weekend, Chrissy frets over being alone in the flat with Robin.
Robin, Chrissy and Jo think that their rent money has been stolen.
Robin gets sick but has plans to play in a football match.
When Robin acquires a puppy, the roommates must hide it from Mr. Roper.
With the Ropers away, Robin, Chrissy and Jo plan a party.
Robin's manhood is put to the test when he is bullied by a tough guy at the pub.
Chrissy's new boyfriend has a secret that Robin tries to expose.
Invited to dinner at the roommates' flat, Mr. Roper clashes with Robin's German friend.
Chrissy and Robin serve as substitute babysitters as a favor for Jo.
After Robin fails his cooking exams, he plans to move back to Southampton.
Larry stays at the flat, driving everyone crazy before Roper rents him the attic.
Chrissy is upset when Robin begins a relationship with her old friend.
Robin doesn't fit in at Chrissy and Jo's work party.
After the girls spot a mouse, Robin tries to use the situation to his advantage.
Chrissy's secret admirer showers her with gifts.
With Mildred gone for the weekend. George tries to trick Robin, Chrissy and Jo into leaving their flat.
Chrissy replaces Robin in a poker game while he is away getting his tonsils removed. All Chrissy has to do now is learn how to play the game!
Robin borrows Roper's car to take Chrissy to a football match, but it breaks down.
When Robin tries to teach Chrissy to drive, he ends up accused of driving while intoxicated.
Roper's dishonest friend convinces him that the trio's flat is overrun with woodworms.
Robin thinks he has gotten his girlfriend in trouble, but Larry has been using his name.
Robin accompanies Chrissy on a visit to her family in the country.
Mildred learns that George has been falsely claiming a son for tax purposes for the past 19 years.
Chrissy makes home movies but Larry and Robin are more interested in the adult variety.
George sells Robin a piano but cannot move it upstairs.
Robin takes a job as a door-to-door encyclopedia salesman.
Robin tries to negotiate with Chrissy and Jo for exclusive rights to the apartment.
Larry tells Robin and Chrissy that the plant that they found in Roper's garden is cannabis.
Robin and Jo compete for a pair of Frank Sinatra tickets that Chrissy does not want.
After George cancels the trio's party, Mildred leaves him.
When Roper raises the rent, the trio try to find a fourth roommate.
George becomes jealous when Robin escorts Mildred to a dance.
Larry buys Roper's sunlamps and sells them to pasty-white Robin to make a profit.
Robin's seemingly perfect brother visits and takes Chrissy out.
Just before Robin can reveal his true feelings to Chrissy, his brother announces that he is going to marry her.
Chrissy marries Norman, George and Mildred announce they are moving away and Robin plans a new life with his girlfriend.
When an unscrupulous developer wants to flatten the street to make way for new buildings, Chrissy, Jo and Robin rally to save the day.
Short special aired as part of All-Star Comedy Carnival.
