Infinity Riders — Kekla Magoon

Earth is in danger! The only things that can save our planet are six essential elements scattered throughout the galaxy. And it is up to the Voyagers -- a team of four remarkable kids and an alien -- to gather them all and return to Earth.
 
On the fourth planet, Infinity, the Voyagers journey deep underground, through a complex maze of tunnels. The tunnels are full of alien life -- and danger. And before they can escape, one of their own will be taken from them....