It's Christmas 1977 and the Smith family are in trouble. The mother, Irene (Lulu), has been chasing young men at the local nightclub. The father, Harold (Tom Courtenay), has accidentally stopped three OAP's pacemakers while using his telekinetic powers to perform party tricks at an retirement home. And the disco-loving son, Vince (Michael Legge), has gone and committed the ultimate disco-crime - he's fallen in love with a punk girl. What's going to happen next is anyone's guess.