Al Shaw's life revolves around motor racing and his back country junkyard, the "Smash Palace". His French wife, Jacqui, doesn't appreciate the lack of attention due to Al's obsession with cars. When Al finds her in the arms of another man, he takes his daughter, Georgie and heads for the bush, desperately hoping to hold on to the only family he has left.
Two brothers take their father into the city for the weekend for a rugby game and a night on the town. However, the old man dies in their hotel and the boys need to smuggle his body back to their farm and make it appear that he died there to satisfy a clause in his will or else they won't inherit the property.
Evil Eva and her cronies threaten to blow their enemies sky-high by reactivating the Rangitoto volcano with a nuclear device. However, the goofy gang isn't all bad - they like to break into song and dance while holding the city for ransom. Who will save the city from destruction? Why a talented trio of kids, including a nutcase who has invented an antigravity machine. The police force, zonked out on Eva's drugged coffee, are made ineffectual.
