"The Walking Dead": The flu that tore through the first half of "The Walking Dead" Season 4 didn't just leave a trail of human victims behind. It also destroyed something the survivors on the show held most dear: it's sense of safety. Sure, they built their defenses around the Prison high to keep walkers out, but nothing could prepare them for the virus that could kill people within a day of showing symptoms. Finally it was proven that nowhere is truly safe in this post-apocalyptic world.
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