Principal Krupp once again turns into the superhero Captain Underpants in order to save the world, and Jerome Horwitz Elementary School, from the evil talking toilets and the Turbo Toilet 2000.

When Professor Pippy P. Poopypants comes to Jerome Horwitz Elementary School to teach science, and he goes off the deep end because students make fun of his name, only Captain Underpants can save the school from the professor's perilous plot.

While sorting through difficulties in her friendship with her neighbor Margaret, eight-year-old Clementine gains several unique hairstyles while also helping her father in his efforts to banish pigeons from the front of their apartment building.

A young girl's talented but untamed tresses do not impress her strict first-grade teacher, who has rules for everything, including hair.

When peanut butter and jelly sandwiches start disappearing from the vomitorium, the security guard of Ella Mentry School, Officer Spence, starts behaving strangely and arresting everybody he sees.

A.J. and his friends find out what amazing things Miss Lazar, the Super Custodian at their school, can do.

When the new vice principal is put in charge of Ella Mentry School for a few days, she tries out some very unusual ideas about how students learn.

When Junie B. cannot play in the school kickball tournament because of a sore toe, she brings her unique talents to the halftime show.

Mrs. Kormel is a weird school bus driver who gets A.J. and his friends so lost that they may never get to school.

When Judy Moody gets serious about protecting the environment, her little brother Stink thinks she is overdoing it, but she manages to inspire her third grade class to undertake an award-winning, environment-saving project.