"When scientists discover a rare and mysterious mineral buried in the Earth's crust, they have no idea that it just happens to be the most valuable substance in the entire universe. It's not long before aliens show up . . . offering a promise of protection, some fabulous new technology, and entry into their intergalactic coalition--all in exchange for this precious resource. A material so precious that other alien forces are willing to start a war...

Discovering a planet that bafflingly appears and disappears, Spacemouse Geronimo Siltonix lands his MouseStar 1 ship to investigate and encounters a race of mysterious, secret-keeping aliens.

When his pet gerbil Henrietta is beamed aboard an alien spaceship, Nicholas finds himself being chased all over the universe by aliens and must find a way to get back home.

Twelve-year-old Jack is almost killed by intergalactic beings when he is mistaken for precocious superspy Gradius Clench, and his only chance for survival is to team up with a ragtag group of alien bounty hunters.

"The Voyagers land on a planet made entirely of water where they must find the third element of the Source that will save the Earth"--

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.

"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.