Living in the boiler room of the school where her father is janitor seems normal to fourth grader Martha Snapdragon, until she has experiences with an evil principal, the class bully, and a mysterious giant spoon, all reminiscent of the Arthurian legends.
Owen and his friends learn the consequences of knowing too much when they decide it will be a fun challenge to spy on the school principal at his own home.
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.
When Mr. Lincoln, "the coolest principal in the whole world," discovers that Eugene, the school bully, knows a lot about birds, he uses this interest to help Eugene overcome his intolerance.
While sitting in detention, George and Harold accidentally create an army of evil talking toilets, and Principal Krupp's alter ego, Captain Underpants, has to save the world from it.
Only Captain Underpants can stop the three evil space aliens who have invaded Jerome Horwitz Elementary School and turned everyone into lunchroom zombie nerds.
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.