When Ella Mentry School invites a local dentist to speak on National Dessert Day, A.J. and his friends uncover the dentist's secret plot to promote cavities for more business.

Sprinkles Newman, the local TV meteorologist, is coming to Ella Mentry School! She s going to teach A.J. and the gang all about the weather. But what happens when a real live (well, not live) hurricane comes to the school? Hold on to your umbrellas!

A.J. and his friends get a Personal Digital Assistant named Miss Porter as a substitute teacher, who can order pizza and tell endless jokes, but grows power-hungry when her system is changed and tries to take over Ella Mentary School.

"There's a new principal at Ella Mentry School. Yes, it's true! Mr. Klutz is retiring and the president of the Board of Education, Dr. Carbles (Boo! Hiss!), has hired the best person for the job -- or at least the funniest. But stand-up comedian Mrs. Stoker will have to face Vice Principal Mrs. Jafee in a big joke-off duel to defend her new job. Will Mrs. Stoker have the last laugh? Or will she lose her audience when things get serious?"--

When Ella Mentry School is threatened with closure due to budget cuts, A.J.'s new speech teacher, Miss Laney, comes up with a brilliant, if weird, plan to save the day.

Mr. Macky dresses up as Abraham Lincoln to get the students at Ella Mentry School excited about their Presidents' Day oral reports.

A.J.'s class is going head-to-head against Dirk School in a charity softball game. The losing team must clean the winning school's toilet with a toothbrush! Mr. Ott, retired baseball pro, intends to lead Ella Mentry School to victory, but will his weird tactics actually make the team lose?

Mrs. Meyer from the local fire department comes to Ella Mentry School to teach the kids about fire safety, but Mrs. Meyer likes fire just a little too much.

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.

Ella Mentry School hires a health teacher who tries to force the students to eat healthy foods and exercise, whether they want to or not.