Some American families have drastically altered their lifestyles in order to survive what they fear will be the end of the world. Johnny O fears a terrorist attack on nuclear power plants, and his prepping philosophy is always having backups for your backups. He is a husband and father of two who lives with his wife and his wife's twin sister, who also knows their bug out plan.

Meet Jason Beacham, a 15-year-old boy from a small town in Missouri who has been prepping since age 11. Jason fears anarchy following economic collapse. Big Al is a musician based in Nashville, Tennessee, who has a secret bug-out location in the mountains of the west. He fears a nuclear attack from Russia. Braxton Southwick is a former professional racer who lives with his wife and their six children in a suburb outside of Salt Lake City. He is prepping for a biological terrorist attack.

At some point, we've all wondered what will happen to our economy. Jay Blevins has probably thought about it more than most. He is a former law enforcement officer who is preparing for a global economic crisis. He fears that social unrest will erupt and has found creative ways to protect his family, including his own recipe for homemade pepper spray.

A single dirty bomb could cause massive chaos. Tom Perez is prepping for a terrorist attack and suspects it's only a matter of time before one gets through our defenses. He has not worked in 12 years because he spends most of his day prepping and spends much of his family's yearly income on preps.

Jeff Bushaw plans to fly his family to safety following the eruption of the Yellowstone supervolcano; Allen and Franco have built sustainable food production systems in preparation for worldwide food shortages; John Adrain has invented numerous security gadgets to turn his estate into a technological fortress safe from a wide range of disasters.

Bob Kay, a nutritional scientist in Southern California, is prepping for environmental destruction due to massive earthquakes; Ryan Croft is prepping for a global financial crisis by cultivating alternative food sources like earthworms; politician Josh Wander is preparing for a terrorist attack, stocking up kosher foods and teaching others about prepping.

Follow three New York preppers as they plan their bug-out to escape destruction from natural disasters.

Brian Smith has big plans for the end of the world.The father of 12 is preparing for a total collapse of the U.S. monetary system and fears that the world's food supply will become scarce. He has stockpiled a year's worth of food, in addition to his recently acquired 47 acres of land in an undisclosed bug-out location, where he plans to grow his own tobacco and sugarcane.

Not all preppers are relying on their nuclear family to survive the end of time; to some, creating a tight-knit community of like-minded individuals is the difference between death and survival. Guided by his intuition and his Apache heritage, a prepper known as “Snake Blocker” is convinced a coming economic collapse will result in social chaos.

Doomsday Preppers visits the household of Amanda Bobbin, who began prepping after being warned in her sleep of imminent danger. These days Amanda and her husband Scott spend their time hidden away in the mountains, where they practice sustainable living to prepare themselves in the event of a comet hitting the earth's atmosphere.

Former firefighter medics John and Kelly are motorcycle riders living on a prepping homestead in the mountains of Virginia in preparation for a total economic collapse. Frank, who owns a construction company in Maine, spends his golden years flying his private plane and preparing for the upcoming economic collapse. Finally, we meet mobile prepper Brian as he prepares for his fear: a terrorist attack.

Prepping for an economic collapse, Jeff is converting a decommissioned missile silo into the perfect bug-out getaway. But that's not all Jeff is focused on. With an online dating profile, he is also searching for a special someone who can share his love for prepping. We'll see Jeff, a bachelor on the lookout for love, not only work on his bunker, but also go on multiple dates to find his prepper mate. We also meet Doug, who lives in the mountains of Tennesse and is known by locals as "Rockman".

Meet Craig, a proud Alaskan living in the woods of Fairbanks, fearing the collapse of the American economy. He's secretly built a bug-out dome, designed by friend and prepping partner Don. Accessible only by boat, the dome will serve as a refuge for his wife and two daughters. Then we follow David, a new age spiritual prepper from Hawaii, who fears a catastrophic tsunami will strike the island but has prepped with his girlfriend to bug out to the top of a mountain.

Meet the Coy family, who live in the shadow of Mount St. Helens and prep for its eruption. Each member of the family has a specific job and multiple means of escape, including over land and water. Another prepper, Capt. William E. Simpson, has spent six years singlehandedly building his perfect bunker, but it's not underground: it's his sailboat.

Meet Mike and his girlfriend Freda, a descendant from “Devil Anse Hatfield,” the leader of the Hatfield Clan. The couple lives in the deep woods of Virginia, and fear that the current political tensions and economic unrest will lead to a world war. Next, we follow Mike Adams, in Oregon, who is anticipating a terrorist attack. Finally, we profile Joe, a nonconformist living in the backwoods of Kansas, who has already given up on modern living.

Brad and Krystal prep hard prepare for an economic collapse. They've stockpiled canned goods, cached weapons and secured bulletproof vests. But their holy grail of prepping is an underground bunker, which they've been struggling to obtain. Kevin and his family live the American Dream, but now they're bugging out to Costa Rica. They believe an economic collapse will make America unlivable. With just weeks until moving day, see how Kevin and his wife prepare their family for a new life.

Think you've got what it takes to survive the end of days? NGC will study the full spectrum of prepper types, from lone wolves to full-fledged neighborhood networks. We'll look at a variety of our best preppers from season 2 to see how their prepping styles differ. Join us as we learn about bunker stew, bunker living and prepping as a team. Doomsday preppers come in all shapes and sizes. From freshly initiated spouses to ex-military types to grumpy kids, there's a prepper to be found anywhere.