Mr. Docker, a new science teacher, is a crazy inventor who blows things up, uses potatoes for power, and has A.J. and his friends wondering whether science is for nerds or is the coolest subject ever.
Even though people say Mrs. Patty, the school secretary, is a witch and her husband is a ghost, A.J. decides to take the risk and trick or treat at their house because they are known to give out the best Halloween candy in town.
When the hippie crossing guard, Mr. Louie, puts a love potion in the water fountain before Valentine's Day, everyone at Ella Mentry School falls in love.
Tired of following the strict rules of their grumpy replacement principal, second-grader A.J. and his classmates try to find a way to bring back eccentric but lovable Principal Klutz, who was fired for bringing a wild turkey to the school's Thanksgiving Day assembly.
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.