Ninety-seven years after nuclear Armageddon destroyed our planet, humanity's sole survivors live on the Ark, an aging space station experiencing overpopulation and inadequate resources. Faced with difficult choices, the Ark leaders - Chancellor Thelonious Jaha, Cheif Medical Officer Abby Griffin and the pragmatic Councillor Marcus Kane - decide to send 100 juvenile prisoners back to Earth to test its living conditions. Among them are Clarke, Abby's independent daughter: the daredevil Finn: and illegal siblings Bellamy and Octavia. With the survival of humanity in their untested hands, The 100 exiles must learn to rise above thier differences and forge a new path on a wild and dangerous landscape that teems with dangerous radiation, unpredicteble conditions and unseen predators... or face the ultimate extinction of the human race!