After 125 years in cryosleep, our heroes wake up to a new home, a place where they can try again. Clarke and Bellamy lead a group down to this mysterious world to start anew, but not everything on Sanctum is as perfect as it seems. Despite their determination to do better, threats both seen and unseen will once again force them to fight for their lives and the future of humanity.

After the stunning events in the first season finale that found all of the survivors of the Ark attempting to return to the surface, and the epic battle with the Grounders, there are plenty of questions for Season Two. Foremost: Who are the mysterious Mountain Men? Who survived the battle with the Grounders? And what���s with that mysterious white room in Mt. Weather?

The fight to survive has torn them apart, turned them against each other, and taken the lives of their closest friends. Last season, a new, even more dangerous threat arose: the A.I. that ended the world was building an army dedicated to controlling all sentient life on Earth. No longer a battle between warring factions; it was a fight for humanity itself. The 100 face their darkest chapter yet.

Reunited with the survivors of the space-station Ark that fell to Earth, Clarke Griffin and her band of juvenile delinquents have faced death at every turn: from a world transformed by radiation to the fierce Grounders who somehow managed to survive it, and the double-dealing Mountain Men from the fortified Mount Weather, whose civilized environment masked a horrible secret.