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Picking up immediately where the previous season finale ended, Clarke and the surviving 48 juvenile exiles (out of the original 100) are alone in their white rooms, frantically trying to make sense of the bizarre surroundings, while the fates of Bellamy, Finn and Raven are still unknown. Outside the lab, Lincoln and Octavia's daring plan to find their friends is thwarted when a lethal enemy returns. Meanwhile, Abby, Kane and the few hundred survivors of the Ark must face physical and moral dilemmas in their dangerous and beautiful new world. Alone on the orbiting remains of the Ark, Jaha makes a heroic decision.