Translation of: L'invasione dei dispettosi Ponf Ponf. "Based on an original idea by Elisabetta Dami."--Title page verso.
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 colorful fuzz balls! But are these creatures as harmless as they look?
Appeals to 2nd-4th graders. Reading level grade 4.