June Scobee Rodgers Presents Star Challengers Book 2: Space Station Crisis 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. Mysterious Commander Zota once again sends them into the future, and this time they will work aboard the International Space Station Complex. They will live without gravity, orbiting high above the Earth-and defend humanity against a ruthless alien invasion