The story of how Daniel—who loves cats but it very allergic to their fur—has a bionic cat built for him by his neighbor and engineer, Professor George. Boing-Boing is just like a real cat, but with fiber-optic fur, computer-controlled joints, electronic eyes, and ceramic-sensor whiskers. When the friends visit London"s famous zoo, they have a hair-raising encounter with a lion who mistakes the bionic Boing-Boing for lunch.