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

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.

George, Harold, Captain Underpants, and Sulu the Bionic Hamster battle the three Ridiculous Robo-Boogers in an attempt to turn the Bionic Booger Boy back into Melvin Sneedly.

Ricky the mouse and his robot get sent to bed without TV, which saves them from falling under a strange spell. When Victor Von Vulture, a villain from Venus, invades Earth, only Ricky and his robot can send him soaring back into space.

George and Harold create a new comic book hero in Dog Man, a crimefighter with the head of a police dog and the body of a policeman, who faces off against his archnemesis Petey the cat.

"Join Li'l Petey, Flippy, and Molly as they introduce comic making to twenty-one funny, rambunctious, and talented frogs. Can the trio help the class unleash their own creativity?"--Provided by publisher. "Li'l Petey, Flippy, and Molly introduce twenty-one rambunctious, funny, and talented baby frogs to the art of comic making. As the story unwinds with mishaps and hilarity, readers get to see the progress, mistakes, and improvements that come with...

"Piggy is back, and his newest plot is his most diabolical yet. Dog Man and the rest of your favorite characters must join together in this heroic and hilarious, ALL NEW adventure. WHAT new villains are on the horizon? WHERE are they all coming from? AndWHO will step forward to save the city when scoundrels sabotage our Supa Buddies?"--