"Hard times ain't quit and we ain't quit."

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We are bringing in another threat, which is nature itself. I don't really want to get into specifics too much, but I will say that there is a third uncontrollable, almost undefeatable threat that is going to come in when the characters of the show are at their most vulnerable. It's really going to be something that they have a hard time dealing with.

— Robert Kirkman