Trailer: National Geographic's 'Doomsday Preppers'
Braxton Southwick is preparing for a biological terrorist attack.
http://www.wtsp.com/video/1966380608001/1/Trailer-National-Geographics-Doomsday-Preppers
http://videos.usatoday.net/Brightcove2/29906170001/2012/11/29906170001_1965492106001_ari-origin05-arc-139-1352818622861.jpg?pubId=29906170001
Trailer: National Geographic's 'Doomsday Preppers'
Braxton Southwick is preparing for a biological terrorist attack.
01:24