David opts to stay home and take care of his son rather than get a new job. Rachel comes back without a baby. Pete learns that Jenny no longer loves him.

Rachel returns to her old job and starts dating a younger man. Pete and Amy find solace together. Jenny convinces Adam to reply to a lonely hearts ad.

Karen has a midlife crisis, smoking dope, getting a tattoo, and shocking David's friends in the process. Jenny finds out about Pete's affair with Amy.

David's younger brother Nick visits and has a fling with Rachel. Adam discovers that he has testicular cancer which prompts Jenny and Pete to give their marriage another go. Rachel tells Adam how she really feels about him.

The three couples spend the millennium on Holy Island. David is upset to find that no-one likes him. Adam and Rachel plan their future.