Only Captain Underpants can stop the three evil space aliens who have invaded Jerome Horwitz Elementary School and turned everyone into lunchroom zombie nerds.

Fourteen-year-old Jason Walker is transported to a strange world called Lyrian, where he joins Rachel, who was also drawn there from our world, along with a few rebels, to piece together the Word that can destroy the malicious wizard emperor, Maldor.

Harold and George's time-traveling Purple Potty lands them in an alternate universe where everything seems delightful, but evil lurks just beneath the surface, and leads to a battle between Captain Underpants and his own evil twin.

Will, now a full-fledged Ranger responsible for a sleepy fief, finds a new adventure as he seeks the traitors who poisoned the king, investigates rumors of sorcery, and tries to rescue his friend Alyss, who is taken hostage.

After Jason succeeds in finding a way back to Lyrian, he's immediately in more danger than ever. Meanwhile, Rachel and the others have made their own progress--as well as discovered new enemies. As the group ultimately rejoins, they strive to convince their most needed ally to join the war and form a rebellion strong enough to triumph against the emperor.

A tribute to moms who serve their country in the military reveals their contributions as unsung heroes who construct buildings, fly planes, drive tanks and do many other important things to make the world a safer place.

Trapped in a dumpster after stopping criminals from stealing from South Ridge Middle School, Max and Erin work to avoid detection--and detention--while keeping the school safe.

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.

War orphan and junior librarian Lazlo Strange gets an unexpected opportunity to follow his dream of seeking the mythic lost city of Weep with the Godslayer and his band of legendary warriors.

Ricky Ricotta, a small mouse, is being bullied at school, but when he rescues a powerful robot from its evil creator, he acquires a friend and protector--and saves the city from Dr. Stinky.