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?

Susan Simmons discovers that her substitute teacher is an alien.

Marco has never wanted to be an Animorph but the Yeerks are about to do something that will change his mind.

Scarlet Benoit and Wolf, a street fighter who may have information about her missing grandmother, join forces with Cinder as they try to stay one step ahead of the vicious Lunar Queen Levana in this story inspired by Little Red Riding Hood.

"Red Schuhart is a stalker, one of those young rebels who are compelled, in spite of the extreme danger, to venture illegally into the Zone to collect the mysterious artifacts that the alien visitors left scattered around. His life is dominated by the place and the thriving black market in the alien products. But when he and his friend Kirill go into the Zone together to pick up a "full empty," something goes wrong. And the news he gets from his girlfriend...

Uprooted to the backwoods of Pennsylvania, a brother and sister discover their scientist parents are part of a mysterious project that could get them all imprisoned or worse.

Rod and his alien friends stumble into danger as the search for Snout, the Master of the Mental Arts, leads them across the stars to the Mentat, the mysterious home of the Mental Masters.

In order to thwart the Mogadorian invasion, a group of the Garde head to a pyramid in Mexico in order to awaken a power that can save the world.

Nomi and her friends get a surprise when they go to see a science fiction movie.

When twelve-year-olds Madison and Felix kidnap him, Ethan learns that the Earth has been taken over by aliens and that all the adults in the world are under mind control.