An asteroid has collided with the Earth destroying life as we know it. In a race against time, 16-year-old Billy Phillips, a natural-born leader, has been selected to guide 100 young recruits on board a space station where they plan to escape the catastrophe. With the help of Dr Joshua Fitchett, a scientific genius, Billy and his friends have been equipped with the skills and knowledge they will need to withstand years in outer space. Their plan is that one day they will return to a restored Earth and re-populate the planet. But danger lies in wait in the most unexpected places...and Billy and his crew will soon find out that survival above is every bit as difficult as survival below.