Star Challengers Trilogy

The Star Challengers, a group of talented young people bound together by a common interest in the space program, return to the Challenger Center for their next mission. Now that JJ Wren, her brother Dylan, and friends King and Song-Ye have seen Earth's dark future - facing an invasion by the hideous alien Kylarn - they know they have to prepare the human race. At the local Challenger Center, the mysterious Commander Zota sends JJ and her friends off on another mission, this time to the International Space Station Complex, where they meet old friends, survivors from the disaster at Moonbase Magellan as well as a mysterious girl, Mira, who claims to be from the past. Another Star Challenger with her own mentor, just like Commander Zota. Together, they have to discover and stop the continuing plans of the alien invaders. And the Kylarn have set their sights on conquering, or destroying, the space station, so that Earth has no protection at all!

After an exhilarating space simulation field trip at the local Challenger Center, a group of students are hand-picked by the mysterious Commander Zota for a special adventure: to travel to the future and a real moonbase in trouble, where they will learn skills to save the human race.

It was supposed to be just an educational field trip to the Challenger Learning Center, but JJ Wren and her friends find themselves transported into the future, to a time when the human race is under siege from deadly alien invaders. The evil Kylarn have shifted the orbits of three asteroids, sending them tumbling toward Earth-and a direct impact will have devastating consequences. With instructions and skills they learn from the mysterious Commander Zota, JJ and her fellow Star Challengers embark on a mission to the asteroids before it's too late, hoping to divert the giant rocks before they strike Earth. But the alien invaders aren't the only enemy-the Star Challengers have to worry about human traitors, too!

Includes all three books: Moonbase Crisis, Space Station Crisis, and Asteroid Crisis. After an exhilarating space simulation field trip at the local Challenger Center, a group of students are hand-picked by the mysterious Commander Zota for special adventures: to travel to the future to save Earth!