When a turtle Dee Dee has befriended gets severely injured, Dexter not only heals it, but also makes it more powerful by giving it bionic limbs, superhearing and a superstrong shell.

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Past the vaulted doors lives the smartest boy the world has ever seen, Dexter, boy genius! He's constantly creating dazzling, worldsaving inventions in his secret laboratory. His big sister Dee Dee frequently wrecks his experiments. However, he has bigger problems such as his nemesis, Mandark, his brilliant rival at Huber Elementary School. Mom and Dad, of course, have no idea what their little angel is up to.