97 years ago the Earth was decimated by nuclear Armageddon. The 400 remaining survivors took to 12 International space stations, where they repopulated their numbers over three generations.
With resources now running out, the 12 stations link together in order to keep the survivors alive. Population control measures are put into place as the leaders take all steps necessary to ensure their future. Part of this action includes secretly exiling 100 young prisoners back to Earth as a test to determine whether or not the planet is habitable.
For these 100 youths, Earth is full of mysteries that can be wondrous one moment and deadly the next. The survival of the human race is in their hands, and they must find a way to work together and forge a new path for mankind.
In my first submission, I was making a prediction of rampant teenage romance which the show is currently trying mightily to rein in.
Even so, I count 2 love triangles with possibly a love bud right now.
The central theme of survival is still at play, thank goodness.