Mr. Tanen, the principal at Lynnhurst Elementary School, is well known for his colorful and unusual ties, but he and his students are saddened when his boss orders him to stop wearing them.

When a principal loves his school so much that he wants the children to attend classes every day of the year, it's up to his students to show him free time is a good thing, too.

A snotty situation ensues when Melvin Sneedley, an academically-gifted student, turns into the Bionic Booger Boy and must be stopped by George, Harold, and Captain Underpants.

Only Captain Underpants can stop the three evil space aliens who have invaded Jerome Horwitz Elementary School and turned everyone into lunchroom zombie nerds.

In this story told primarily through letters, Principal Russ wants the middle school trees to be trimmed before his administrative evaluation, but the project is interrupted by a town gender war, dueling chefs, student tree protests, and a surprise wedding.

Mr. Tanen loves his ties, but when his school runs out of money to build a new playground, he decides to sell his ties in order to raise the needed money.

Mac McGerp, winner of the Best Burper first prize at the Tri-county Fair, and his good friend, Lido, try to figure out how to deal with the new repressive school principal.