Appointed Earth's ambassador to the universe, twelve-year-old Gabe Fuentes faces two sets of "alien" problems when he discovers his parents are illegal aliens and face deportation and the Earth is in the path of a destructive alien force causing multiple mass extinctions.

The Mogadorian invasion has come to Earth, and they have all but won the battle for our planet. Their warships loom over our most populous cities--like New York City, Tokyo, Moscow, Beijing, and New Delhi--and no army will risk making a move against them. The Garde are all that stand in their way . . . but they are no longer alone in this fight. Human teens from across the globe, like John Smith́s best friend, Sam Goode, have begun to develop Legacies...

Having each been awarded a Fellowship for Alien Detection (a grant from a mysterious foundation dedicated to proving aliens exist), Haley and Doger and their families set off on a cross-country road trip to prove aliens exist --but someone ... or something ... is doing everything in its power to make sure they never reach the vanished town of Juliette, AZ.

"The Krakau came to Earth to invite humanity into a growing alliance of sentient species. But they hadn't counted on a mutated plague wiping out half the human population, turning the rest into shambling, near-unstoppable animals, and basically destroying human civilization. You know, your standard apocalypse. The Krakau's first impulse was to turn around and go home. (After all, it's hard to have diplomatic relations with mindless savages who eat...

A story complemented by fun scientific facts and a do-it-yourself experiment finds young Zack working to protect his tiny alien friend, Amp, while struggling through a science-fair project and preventing an alien invasion.

Abducted by aliens periodically throughout his youth, Henry Denton is informed by his erstwhile captors that they will end the world in 144 days unless he stops them by deciding that humanity is worth saving.

First the rain brought seeds. Seeds that grew into alien plants that burrowed and strangled and fed. Seth, Anaya, and Petra are strangely immune to the plants' toxins and found a way to combat them. But just as they have their first success, the rain begins again. This rain brings eggs. That hatch into insects. Not small insects. Bird-sized mosquitos that carry disease. Borer worms that can eat through the foundation of a house. Boat-sized water striders...

Moving from Earth to the futuristic planet Nebulon in 2120, eight-year-old Zack is nervous about starting school and meeting people.

Young Alice Dare is relieved that at last humans and the alien Morrors are now living peacefully together on Earth. But with an influx of too many Morrors, space is getting a bit tight. To make room for all the Morrors, they've been terraforming a cold little moon in the Alpha Centauri system -- and Alice and her friends are invited to the inauguration of the Morrors' new home! But just as they're approaching Alpha Centauri, the kids are kidnapped...