故事讲述洛杉矶出现了神秘巨大天坑，一个家庭也由此被一分为二，母亲儿子与父亲女儿被迫分离。当一部分家庭发现自己和一群形形色色的陌生人一起身处在一个无法解释的原始世界时，他们必须努力求生，并揭开自己...
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