When Space mouse Geronimo Stiltonix 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.

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 and his crew explore the underwater planet of Aquarix, where they face fur-eating seaweed, ferocious piranha aliens, and pirate spacecats.

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 Stiltonix 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.

When the MouseStar 1 lands on a mysterious planet that appears and disappears on the radar, Geronimo and his fellow Spacemice encounter aliens.