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.
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.
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.
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.