Johnny Boo is the best little ghost in the whole world, because he's got Boo Power. This means that he can go "BOO" really loudly. His pet ghost named Squiggle has Squiggle Power, which means that he can fly and do really fast loop-the-loops. Together they have the world's greatest ghost adventures!

When Johnny Boo is busy with another friend, Squiggle tries to make a new friend of his own but instead gets captured by a butterfly-hunting boy.

"Johnny Boo zooms to the moon on a star-powered skateboard, where he meets a spunky little girl ghost named Susie Boom. She has BOOM power, which is pretty darn loud. Luckily, the moon has ice cream. But oh no! It also has an ice cream monster, just like back on Earth" --

"Johnny Boo creates an incredible Ice Cream Computer that can turn anything into delicious ice cream. Old toys that you don't want to play with anymore? Ice cream! Clods of dirt and grass? Ice cream! It works great ... until Squiggle decides to turn himself into ice cream! Then: Johnny Boo time travels to the future, where the Mean Little Boy tries to add him to his butterfly collection. Can Squiggle save the day, or will everyone get turned into...

"Johnny Boo lets Squiggle borrow his magic hammer so Squiggle can work on a mysterious project, but that leaves Johnny Boo with nothing to do today. He has lots of great ideas about how to spend his time while he waits, but ends up getting bored of each and every one of them. Not to worry, though. Joined by Squiggle, the Ice Cream Monster, and a big new friend, Johnny Boo will still have a hilarious adventure...and maybe even learn something about...