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!
