When Miss Greer asks each child in the class to write a story, second-grader Aaron, who loves to draw but struggles with reading, creates a story using pictures.

Three more stories of Martin's plans unravelling. This time, his school is having a parade, the illustrator of his favorite comic book will be visiting his classroom, and will show him and his classmates how to draw Zip Rideout.

When Andy develops a severe toothache that prevents him from writing new jokes for their book, Terry uses their fantastical treehouse's money-making machine funds to purchase a Joke Writer 2000, with unexpected results.

Andy and Terry travel through time trying to save their treehouse from highly talented, angry ants and Inspector Bubblewrap the building inspector while rushing to meet their publisher's deadline.

Who wouldn't want to live in a treehouse? Especially a 13-story treehouse that has a bowling alley, a see-through swimming pool, a tank full of sharks, a library full of comics, a secret underground laboratory, a games room, self-making beds, vines you can swing on, a vegetable vaporiser and a marshmallow machine that follows you around and automatically shoots your favourite flavoured marshmallows into your mouth whenever it discerns you're hungry....

Andy and Terry must get past their differences to save their story ideas from a herd of spy cows.