#1
Chapter Book · Ages 7–10 · 1997
Two fourth-grade pranksters hypnotize their principal and accidentally turn him into a superhero.
#2
Chapter Book · Ages 7–10 · 1999
Two fourth-grade pranksters accidentally create an army of evil talking toilets that threaten to take over the world.
#3
Chapter Book · Ages 7–10 · 1999
Alien lunch ladies threaten the school. Can Captain Underpants save the day?
#4
Chapter Book · Ages 6–10 · 2000
Two fourth-grade pranksters accidentally create a superhero when they hypnotize their mean principal, who then battles a variety of villains, including a mad scientist and a giant robot.
#5
Chapter Book · Ages 6–10 · 2001
Two fourth-grade pranksters accidentally hypnotize their mean teacher, turning her into a supervillain.
#6
Chapter Book · Ages 7–10 · 2003
Two fourth-grade pranksters accidentally create a bionic hamster that wreaks havoc on their school, leading to a series of misadventures and a showdown with their nemesis, Melvin Sneedly
#7
Chapter Book · Ages 6–10 · 2003
Two fourth-grade pranksters accidentally switch the brains of their mean principal and a nerdy classmate using a machine called the Combine-O-Tron 2000.
#8
Chapter Book · Ages 7–9 · 2006
Two fourth-grade pranksters travel through time and space, causing chaos and mayhem wherever they go.
#9
Chapter Book · Ages 7–11 · 2012
Two fourth-grade pranksters accidentally hypnotize their mean principal and turn him into a superhero.
#10
Chapter Book · Ages 7–9 · 2013
Two fourth-grade pranksters accidentally travel back in time and must find a way to return to their own time.
#11
Chapter Book · Ages 7–11 · 2014
Two fourth-grade pranksters accidentally travel through time and must find a way back to their own time.
#12
Chapter Book · Ages 7–9 · 2022
Two fourth-grade pranksters must stop their gym teacher from taking over the world with his mind-control formula
