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?
When Space mouse Geronimo Stilton helps an alien spacecraft get back to its home planet, their queen becomes enchanted by Geronimo, and tries to force him to marry her and stay on the planet Flurkon forever.
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?
"The spacemice have received an invitation to participate in the intergalactic soccerix championship. It's a tournament for the most popular sport in space! But Geronimo doesn't even know how to play Soccerix, let alone lead a team to victory against aliens with bizarre skills (like flying)! Can the spacemice team prevail?"--Page 4 of cover.
Geronimo Stilton meets outer space in this cosmically fun spin-off series! Geronimo Stiltonix and his crew head to the planet Jurassix to warn its inhabitants of a giant comet heading straight toward them! But the creatures there turn out to be ferocious, dinosaur-like beasts . . . who like to eat rodents. Squeak! Can the spacemice save these aliens and still make it out alive?
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! Can the spacemice keep the spacecats from stealing the treasure?
MouseStar 1 is surrounded by floating space junk! It's yucky--and dangerous. It's coming from a nearby planet, Cleanix. Geronimo Stiltonix goes to visit, and discovers that the aliens there are very wasteful. Even worse, robots that they've thrown in the trash have started to rebel! Can the spacemice restore harmony before the robots take over?
Each year in the cosmos, on the Night of Dancing Stars, the Elfix aliens distribute gifts to all the creatures of the galaxy. But this year, the holiday is fast approaching, and the spacemice discover that the Elfix have all disappeared. Can Geronimo Stiltonix and his crew find them before their special night?
Geronimo Stilton takes MouseStar 1's broken computer to a distant planet to be repaired by a brilliant inventor, but pirate spacecats attack and steal the device, and the spacemice must retrieve it before the machine can be turned against them.
"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?" --