After being cast as the Ninja Master in his school's Halloween play, a boy decides it is time to catch the monster in his closet.

It is a very hot summer in Stermont, and Alexander and his friends are at Camp Gloamy in the mountains, but even here there are monsters--specifically zombie snowmen called snombies who want to freeze the young monster-hunters.

When a goo monster crashes the science fair, the Princess in Black is on the job, and with the help of the Princess in Blankets, sets out to save the science fair.

A young monster says goodnight to all of the other monsters in his bedroom.

When the Halloween Witch opens a magical portal and lets in all the Halloween creatures, the Catch Club Kids set up a trap to catch and creatures and send them back.

Ethan tries to help his toddler sister find her own bedtime monster.

When Alexander and his friends find a very large footprint and piles of candy everywhere, they realize the school is being threatened by a Piñata-saurus Rex, a sweet-tasting monster who likes to smash things--and they find that the solution may be as near as a broken ant farm.

Starring in their own epic adventure, dynamic duo Quint Baker and Dirk Savage encounter new monsters and embark on a post-apocalyptic quest for the ages.

Picking up after Quint and Dirk's Hero Quest, the Last Kids are happily reunited--but quickly faced with a monstrous new mission. Inside an other-dimensional fortress, the evil Thrull, alongside a vile new villain, is carrying out a sinister plan. Jack, Quint, June and Dirk must make their own plans to infiltrate the stronghold before Thrull gets any closer to completing the mysterious Tower, a structure that could ultimately spell doom for this dimension....

The latest monsters threatening Stermont Elementary are shadowy shapeshifters that attach themselves to people, eat their shadows, and block out all light--but before he can think of a way to deal with them, Alexander has to deal with a startling revelation from his friend Nikki.