Dick King-Smith, creator of "Babe the Sheep-Pig", presents the cleverest guinea pig in the world! Judy's classmates snigger when she claims guinea pigs are brainy. But, when her guinea pigs have a baby son, she decides to call him Jenius and train him to prove her point. Soon he can do all kinds of clever tricks, and Judy can't wait to show him off at school. After all, what could possibly go wrong?