Dav Pilkey

George and Harold are forced to contemplate a world without Captain Underpants.

After Principal Krupp forbids George and Harold from continuing to create comics about feces, the boys begin a story about Rip Van Tinkle, a man who transforms into a puddle of urine and begins to destroy all of the toilets in town.

A small mouse and his best friend, a giant flying robot, attempt to save the Earth when an evil Martian monkey and his mechanical creations attack.

A small mouse named Ricky Ricotta and his best friend, a giant flying robot, save the world from Victor Von Vulture and his vicious Voodoo Vultures from Venus.

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.

General Jackrabbit and his Robo-Rabbits from Jupiter attempt to take over the world on Ricky Ricotta's birthday.

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.

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.

Evil Uncle Unicorn attempts to dominate earth by using a Ladybot to trick Mighty Robot.

Dragon is lonely so he goes looking for a friend and when an apple falls on his head he is convinced that he has found one; but at home Apple is quiet and unresponsive, and when a visit to the doctor only makes things worse, Dragon mourns the loss of his friend--until an apple tree grows where Apple is buried.