Ninja Kid 6 - The giant ninja

It's time for the annual Halloween funfair in Putdam. Unfortunately, Nelson and Kenny are still not tall enough to be allowed on all the cool roller coasters. Maybe Grandma Jansje's latest invention can help them: a zapper that lets you change the size of something. But when they use it, everything goes wrong; the boys are suddenly very small!
Now they are not allowed to go anywhere at all and to make matters worse, the funfair is also attacked by gigantic robots! Will the boys be able to grow up again in time to defeat the robots?
The Giga Ninja is already the sixth part of the cheerful and beautifully illustrated adventures of Ninja Kid and H-gast.