Second-grade graduate A.J. and his family rent a beach house, but summer vacation is ruined when annoying Andrea shows up and develops a crush on the lifeguard.
A.J. and his classmates are convinced that new school librarian, Mrs. Roopy, has multiple personality disorder because she keeps pretending to be famous people.
New third grade teacher Mr. Granite has so many strange ideas about how to make Ella Mentary School environmentally friendly that the students are sure he must be an alien.
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.
The new lunch lady at Ella Mentry School, Ms. LaGrange, writes secret messages in the mashed potatoes and tries her best to get A.J. and the other students to eat healthy foods.
Life at Ella Mentry School gets a lot more interesting when the self-proclaimed nerd Mrs. Yonkers takes over the computer lab, and a new rule goes into effect banning all junk food.
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.