Bill, Ben, Rona and David end up as stowaways on a cruise ship after dropping off Ben's sister. Meanwhile, Jenny is stuck at home with Bette and Aunt Pearl, who set about making Christmas dinner.

Rona turns up with an abandoned baby, which crawls under the floorboards. Ben finds a novel way of coping when he starts to feel depressed about his age.

Bill is locked inside a wardrobe wearing only a fur coat. Ben is facing a midlife crisis.

Bill's not keen to agree to owning a family pet because she thinks she'll end up looking after it. Ben suggests they create an imaginary dog for two weeks - but they end up with three real ones.

Ben is bored and missing the football season, while Bill and Rona are also feeling listless. Meanwhile, Jenny's boyfriend sets off to buy a ring...