Professor Greenfur, the onboard scientist on spaceship MouseStar 1, has changed color from green to... orange! What's going on? To find out, the spacemice travel to his home planet of Photosyntheson. There, they learn that all of Professor Greenfur's relatives are being threatened by the nibblix, tiny aliens with very sharp teeth! Can the spacemice help in time?

 

This book is part of a book series called Geronimo Stilton .

There are 128 pages in this book. This book was published 2017 by Scholastic US .

In his spare time, Mr. Stilton collects antique cheese rinds. But what he most enjoys is writing books where he tells his fabmouse adventures!