When George and Harold hypnotize their principal into thinking that he is the superhero Captain Underpants, he leads them to the lair of the nefarious Dr. Diaper, where they must defeat his evil robot henchmen.

Class 507 is terrible, and one day, after a particularly disastrous science experiment, Ms. Bryce quits and walks out in the middle of class, and the school office never finds out--at first all the fifth graders enjoy goofing off, but after a few days that starts getting boring, and the students begin to realize that school without a teacher is not easy, cooperating is difficult, and keeping a secret is harder than they thought.

Ravi has just moved to the United States from India and has always been at the top of his class; Joe has lived in the same town his whole life and has learning problems--but when their lives intersect in the first week of fifth grade they are brought together by a common enemy (the biggest bully in their class) and the need to take control of their lives.

George and Harold and their doubles, Yesterday George and Yesterday Harold, have been taking turns going to school, but when the doubles fall prey to their gym teacher, Mr. Meaner, and his method of mind control that turns students into attentive, obedient, perfect children, it is up to original George and Harold to strike back.

"Dash and his friends Rob and Greta are used to unusual things happening at their school, Swedhump Elementary. But even they pay attention when their invisible principal, Mrs. Rosebank, announces that they have a special guest: Ms. Aqualine, the owner of the new Aqualina Water Park. Most elementary students don't get to spend time on waterslides during the school day. But soon Dash, Rob, and Greta are slipping and sliding ... right into a mystery!...

In a story told in letters, when Claire's best friend moves away just before the start of fifth grade, Claire becomes the only girl in her tiny island elementary school--and suddenly boys she has been friends with her whole life turn into resentful, bullying strangers.

After a series of spectacular-and at times, hilarious-disasters, including being expelled from school, perfectionist Elfie Oster discovers what truly matters as she tries to make sense of everything that is happening to her.

Family, school, and life in general are seen through the writings of four fifth graders who have been taken out of an overcrowded New York City classroom and placed with a teacher who shows them how to write and how to believe in themselves.

Phineas L. MacGuire -- scientist extraordinaire -- has a new chore: cooking dinner every night. He may be a genius, but he knows nothing about following a recipe. On top of that, he has to come up with a mouthwatering recipe for a bake-off-- the prize is $10,0000! And to make matters worse, Evan Forbes, the school bully has taken a liking to Phineas' brownies... too much of a liking. Now he wants a new batch of brownies every morning, and if Phineas...

In Underworld Elementary School, a school for kids who have died in peculiar ways, Dedbert is the butt of everyone's jokes because he flushed himself down the toilet--until a girl arrives who died in the same way.