Spacemice

Space mouse Geronimo Stiltonix must replace the batteries in his damaged spaceship by tracking down a rare element but he is wary of a group of mysterious aliens who offer their help.

"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 aliens that look like colorful fuzz balls! But are these creatures as harmless as they look?"--Back cover.

"While at the beach, Geronimo Stiltonix stumbles upon a mysterious treasure map! The spacemice follow it and end up on Aquarix, a planet that's entirely underwater. During their exploration, they face fur-eating seaweed, ferocious piranha aliens, and ... pirate spacecats! Squeak! Can the spacemice keep the spacecats from stealing the treasure?"--Back cover.

Traveling to the planet Jurassix to warn its inhabitants of an imminent comet strike, Geronimo Stilton and his crew encounter ferocious, dinosaur-like beasts who have an appetite for rodents.

Geronimo Stiltonix helps out a group of aliens whose spaceship has broken down, but the alien queen becomes enchanted by Geronimo and doesn't want to let him leave.

Geronimo Stiltonix's spaceship is in danger of exploding! The only solution is to replace the engine's batteries by tracking down a rare element. When a group of mysterious aliens claim they can help, Geronimo is relieved. But are the aliens as friendly as they seem?.