12 books in series

Geronimo Stilton: Spacemice

Geronimo Stilton: Spacemice is a 12-book series with 12 primary works first released in 2013 with contributions by Geronimo Stilton and Elisabetta Dami.

Alien Escape
You're Mine, Captain!
Ice Planet Adventure
The Galactic Goal
Rescue Rebellion
The Underwater Planet
Beware! Space Junk!
Away in a Star Sled
Slurp Monster Showdown
Pirate Spacecat Attack
We'll Bite Your Tail, Geronimo!
The Invisible Planet