一位单亲母亲，带着一儿一女(“汤姆·里德尔”弗兰克·迪兰和艾丽西亚·戴伯南·凯瑞饰)，联手男主肖恩(克利夫·柯蒂斯饰)一起末日求生。剧集故事发生的时间与《行尸走肉》第一季相同，不过故事发生地在洛杉矶。
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。
The fifth-year residents return for the first day of a year that will make or break their careers: Meredith faces the consequences of tampering with Derek's clinical trial and is terminated at the hospital; April tries to step up to the plate as Chief Resident in the wake of a giant sinkhole in the middle of Seattle; and Cristina and Owen are still at odds over their drasticall...
