Ug and his parents live in the Stone Age. This means stone blankets, stone cold food, an even colder cave and, worst of all, hard stone trousers!

Being an inquisitive boy, Ug suggests a series of modifications to improve the quality of family life.

His ideas about heating, cooking, boats and balls that actually bounce meet a hostile reaction from his parents and friends.

Even Ug himself is occasionally unsure of the practical purpose of his creations - his round stone that rolls down the hill is great, but what is it actually for?

With the help of his father, who is slowly coming round to his son's way of thinking, Ug comes tantalisingly close to his ultimate garment goal, only to find that there are obstacles even a boy genius cannot overcome.