After the global nuclear war, the only remaining humans hid in the space station Ark to survive. In order to preserve resources and control the population, any adult who breaks the law will be sentenced to death. Nearly a hundred years later, the oxygen in the space station is about to run out, and humans are facing the threat of death. For this reason, one hundred juvenile offenders, including the girl Clark (Eliza Taylor-Cotter) and the prime minister's son Wells (Eli Goree), were forced to go to Earth. Even if they are victims at a critical moment, they are the last hope of mankind. The young people who successfully arrived on Earth are eager to get rid of the shackles of the Ark, while Clark insisted on looking for supplies with several companions, and during this period they discovered that there are still humans on Earth. On the other hand, the political situation in the Ark is turbulent, the prime minister is assassinated, and the acting prime minister Kane (Henry Ian Cusick) is ready to move, and the fate of mankind hangs on a thread...