#3 Spacemice: Ice Planet Adventure - Paperback | Geronimo Stilton
Friends of the Spacemice have disappeared on a strange ice planet, Polarix! Geronimo Stiltonix and his crew are called to search for them. When the spacemice arrive on Polarix, they're surprised at the inhabitants -- cute little aliens that look like colourful fuzz balls! But are these creatures as harmless as they look?