Dec. 13, 2012 at 10:26 AM ET
"A zombie apocalypse happening is not a question of if, it's a question of when," at least according to a group of zombie preppers featured on Discovery Channel's upcoming special.
The cable network's upcoming "Zombie Apocalypse" special features the stories of four individuals -- a teacher, mother of two, ex-military firearms instructor and founder of the Kansas Anti-Zombie militia -- who are preparing for what they confident is an impending outbreak a la "The Walking Dead."
And they have the scientific proof, as seen in the exclusive clip from the Dec. 18 special. "A zombie pandemic ... is something that is plausible, it's something that at least in terms of spread, is very likely," Dr. Robert Smith of the department of mathematics at the University of Ottawa warns.
Even worse: experts predict that a potential virus leading to an outbreak could overwhelm a city the size of New York in eight to nine days once a single zombie is infected.
Check out the clip, above, to meet the zombie preppers.
"Zombie Apocalypse" airs Dec. 18 at 10 p.m., capping off the network's "Apocalypse Tuesday" featuring "How the World Will End" at 8 p.m. and "Apocalypse 2012 Revelations" at 9 p.m.
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