With Abby having been gone for about six months, Don and Eddie both want different women to move into the spare room.

Don starts dating an older woman but can't handle the grown up world she lives in. Sam has befriended a male friend from university who Don catches rifling through her underwear drawer.

Sam is dating cool singer-songwriter Jackson, reawakening Don's hitherto unspoken ambition to be a musician.

Don's lodger, Sam, invites her brother, Jamie, over for the weekend. Dan starts to wonder if he is gay.

Don joins a gym to prove to Sam and Eddie that he's fit and healthy, but he fails to get beyond the running machine without passing out. He soon gives up on the gym and decides to go for a colonic irrigation, instead, where he ends up agreeing to go on a date with the therapist.

Don is asked to be the best man at his old school friend's wedding. But finding someone to pretend to be his wife for the day is far from his only challenge.