Will is forced to overcome his fear of Wargals, the foot soldiers of rebel warlord Morgarath, as Araluen's army prepares to battle Morgarath's forces.

Max, the young son of superheroes, is a late bloomer when it comes to flying, until he is inspired by the plight of a falling baby bird.

Oliver feels like the superhero Mighty Pig when he wears his Mighty Pig cape, but he finds that being a superhero in the real world has some complications.

Fifth-grader Nolan Byrd, tired of being called names by the class bully, has a secret identity--Shredderman!

Not everyone at school is excited about Fashion Kitty's newfound popularity. A spoiled new kitty named Cassandra doesn't like sharing the spotlight. And when Fashion Kitty starts inspiring the other cats at school to be more independent about their style choices, Cassandra really doesn't like it. So she hatches an evil plan that involves lying, conniving, and outlawing bright colors and patterns.

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.

Irrepressible friends George and Harold create a new comic book superhero, Super Diaper Baby.

Zero believes that he is a hero, but the counting numbers think he is worthless until they get into trouble with some Roman numerals, and only Zero can help.

Principal Krupp, in the guise of his alter ego Captain Underpants, tries to come to the rescue when three evil space aliens infiltrate Jerome Horwitz Elementary School and turn everyone into lunchroom zombie nerds.

Oona Lee arrives on Salassandra determined to light the yellow beacon and continue her quest to save the Five Worlds from the evil Mimic's influence.