在第一季结尾中，Jaha自愿留在太空中，换来方舟部分人成功降落到地球上的好消息。但百子们却在成功引爆驻地打败地表人后，被抓到气象山的隔离区中……Bellamy和Finn也在与地表人的打斗中生死未卜。 而这一季的故事就从气象山、原方舟人和其他地球人种展开来。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.
