In a small rural munity local police officers Zoe and Patrick begin their shift as normal but it soon bees clear that something is wrong. Strange events unfold before their eyes, residents begin behaving strangely and mass suicide panic spreads amongst the munity they are trying to protect. Zoe and Patrick realise they are under siege from alien machines as they bee cut off from the outside world. They are forced to do battle against these uninvited visitors. With the help of some of the residents Zoe and Patrick begin unravelling the mystery and soon discover it is not all as it seems. Can Zoe and Patrick save their munity and the outside world from extinction?
在一个小的农村社区，当地警察佐伊和帕特里克开始正常换班，但很快就清楚出了问题。奇怪的事情展现在他们眼前，居民开始奇怪的行为，大规模的自杀恐慌在他们试图保护的社区中蔓延。佐伊和帕特里克意识到，当他们与外界隔绝时，他们正受到外来机器的围攻。他们被迫与这些不速之客作战。在一些居民的帮助下，佐伊和帕特里克开始解开这个谜团，很快发现它并不像看上去的那样。佐伊和帕特里克能拯救他们的社区和外部世界免于灭绝吗？</p>...
这一季中，主修心理学的大学教授Eli（杰米·肯尼迪 Jamie Kennedy 饰）在遭遇一次火灾意外死后复生，竟然成为了能听见亡魂说话的倾听者。在话唠加神经质的Rick去了远方以后，他就成了Melinda（詹妮弗·洛芙·休伊特 Jennifer Love Hewitt 饰）的新助手，一直协助她完成逝者身前的遗愿。Melinda和丈夫Jim（大卫·康拉德 David Conrad 饰）一直努力想生个宝宝，但始终未能如愿。一次在Melinda帮助鬼魂时发生了意外，为救妻子Jim中枪身亡，也变成了游荡的鬼魂。在一次交通事故现场，Jim附身在一个刚死去的人Sam身上复活了，但却失去自己的记忆。...
