An all-new Geronimo Stilton series spin-off, set in outer space! Meet Geronimo Stiltonix: He is a spacemouse—the Geronimo Stilton of a parallel universe! He is captain of the spaceship MouseStar 1. While flying through the cosmos he visits distant planets and meets crazy aliens. His adventures are out of this world! ALIEN ESCAPE Geroimo 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?

Geronimo Stilton meets outer space in this cosmically fun spin-off series! Meet Geronimo Stiltonix: He is a spacemouse—the Geronimo Stilton of a parallel universe! He is captain of the spaceship MouseStar 1. While flying through the cosmos he visits distant planets and meets crazy aliens. His adventures are out of this world! YOU'RE MINE, CAPTAIN! The MouseStar 1 is contacted by strange aliens whose ship has broken down! Geronimo Stiltonix is happy to help them out, and even accompanies them to their home planet Flurkon. But during his visit, the alien queen becomes enchanted by Geronimo—and wants to marry him! Will he be forced to stay on Flurkon forever?

Geronimo Stilton meets outer space in this cosmically fun spin-off series! 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?

Geronimo Stilton meets outer space in this cosmically fun spin-off series! 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?

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?

Spacemouse Geronimo Stiltonix's adventures are out of this world! 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?

Spacemouse Geronimo Stiltonix's adventures are out of this world! MouseStar 1 is surrounded by floating space junk! It's yucky—and dangerous. Geronimo Stiltonix tracks down the source of the junk, and meets very wasteful aliens. Even worse, robots that the aliens threw away have started to rebel! Can the spacemice restore harmony before the robots take over?

Each year 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?

The on board computer on spaceship MouseStar 1, Hologramix, is out of order! To fix it, Geronimo Stiltonix must take it to a brilliant inventor who lives on a distant planet. But while Hologramix is being repaired, pirate spacecats attack, and steal it! Can the spacemice get Hologramix back before the spacecats turn it evil and set it against them?

Spacemouse Geronimo Stiltonix's adventures are out of this world! 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?

Spacemouse Geronimo Stiltonix's adventures are out of this world! Geronimo discovers a planet on the radar that mysteriously appears and disappears. MouseStar 1 lands to investigate and they discover mysterious aliens who hide a secret!