On her hen night, as she watches Louise stage dive into a crowded dance floor and Karen recreate the Bacardi ad on the club bar, Donna realises with absolute drunken clarity that single girls have more fun. In this state of inebriation she declares the wedding off. Karl responds by running into the kitchen wall and begging Donna not to leave him. Donna moves in with Karen, and so life begins.

Karl tries to kill himself but changes his mind at the last minute. Donna discovers him hanging by a noose and saves him. At a party, Karen is being stalked by Mark, who she really cannot stand. The girls persuade Donna to let a friend of Louise's called Tanya look after Karl. The party is a disaster, and Donna returns to find Tanya's relationship therapy session with Karl has been less than helpful.