As the new computer lab teacher tries to bring Ella Mentry School into the twenty-first century with her peculiar inventions, second-grader A.J. struggles to survive without sugary snacks when principal Klutz bans junk food.
His parents have placed the perpetually hungry Billy on a strict diet--no junk food--and despite the trouble it causes him, it looks like he will be in shape for the annual school jump-a-thon--which is interrupted by a trio of teenage thieves.