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.

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.

Deep in Oregon's backcountry sits an 80-acre off-the-grid estate that prepper Curt and his family have designed as a fortress in the event of an economic collapse. Isolation is one of their greatest strengths, but the protective measures are endless: a 3,000-square-foot greenhouse, a lake with 1 million gallons of water, infrared cameras and a high-tech software system — not to mention the children are trained in marksmanship.

Outside of Fort Worth, Texas, Vietnam veteran Richard Huggins is preparing for a nuclear strike by a terrorist state, a concern he believes is amplified by his proximity to the defense production hub of Dallas-Fort Worth. Meanwhile, in rural Colorado, Dr. Dave, his wife, Dee, and their young daughter are prepping for a possible solar flare that could lead to widespread illness and death due to lack of medical care.

Prepper Chad believes that a nuclear strike resulting in a genocidal siege is a real possibility. At his home in Arizona, he is working on executing the biggest prep of his life — a 140-foot-long escape tunnel from his family's house to a bug-out vehicle. With the help of his wife and daughter, he begins construction — but as the project unfolds, they realize they're in over their heads.

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.

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.

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

Could an explosion on the surface of the sun cause mayhem on Earth? Jason and Jacob are a father-son team from Alabama who are prepping for exactly that: a global solar flare with the potential to wipe out power grids around the world. Jason was almost stranded for good in the wilderness when he was 19, but that will not stop him from prepping in those very same woods by molding his own ammunition and preparing his 20-piece bug-out pack.

In Texas, Kenny and his wife Connie are preparing for a civil war. With defense as their ultimate concern, they're building a fortified bulletproof rooftop command center. In Maryland, Kevin is prepping for an EMP attack. Kevin is very protective of his close-knit family, including his three pregnant daughters. Their survival plan relies on a customized 15-ton bunker buried 20 feet underground and stocked with baby supplies and doomsday essentials

The possibility of World War III is a major concern for many preppers, including former Marine Alex Dunbar, who is training a private army of German Shepherd attack dogs in San Luis, Colorado. In the woods of East Appalachia, Brenda McSwigan fears that a vicious mutating virus will lead to a pandemic that will overwhelm hospitals and leave the rest of the country in chaos. Another prepper, Grace McLeod, secures her 3,500 square-foot fortress before an economic collapse.

The five basic principles while preparing for a cataclysmic event are food, shelter, safety, evacuation, and practice.

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.

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.

To protect his family from Doomsday marauders, Rob is devising the ultimate booby-trap system. He's securing his Texas property's perimeter with an elaborate system of alarms, traps and defense mechanisms. In Tenn., Greg is preparing for a financial catastrophe by building an invisible tree house where he hopes to be safe from looters. If the build goes as planned, his family will have a tree house 12 feet into the forest canopy, with mirrored paneling and a stockpile of food, water and ammo.

Doug Huffman is rightly prepared teaching survival techniques for the second depression based upon America's massive "debts".; Dianne and Greg Rogers, dedicated parents in Canada are concerned with future events effecting their home-life; Ed and Dianna Peden ("still living in the 60's"), of Topeka, Kansas are preparing to survive and thrive fully underground when doomsday arrives in their decommissioned Atlas missile site.

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.

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.

An economic collapse could mean total chaos for the U.S. -- looting, riots and civil unrest are top concerns. In Washington state, Steve works with a stern hand to prep his family for the potential threat. South Carolinian David Appleton is a comedian, but the idea of a devastating earthquake is no joke to him. His job doesn't always pay the bills, so David must Dumpster dive to find supplies to make a DIY camouflage net to hide his preps.

David Sarti a Youtube "firearms instructor" and self-taught survivalists is prepared for an electrical grid failure; Kellene Bishop a Utah resident has stored away the finer things in life for a financial collapse; Kathy Harrison, the Doris Day of Doom has prepared her local community for a New Madrid earthquake; Dennis Evers brings the family together to survive global chaos caused by hyperinflation.

Paul Range and friends prepare for a "polar Shift"; In California Christopher Nyerges demonstrates urban jungle survive skills in the event of a massive earthquake; Deep in the heart of Houston, Texas Megan Hurwitt hopes to survive on her own after the all the oil and gas runs out.

Tim Ralston - A survival tool manufacturer himself (the Crovel), loses part of a thumb during firearms practice for the show; Jason Charles, The New York City Fireman/Prepper demonstrates expert urban survival skills; Jules Dervaes has prepared well for the collapse of the industrial food system; Pat Brabble insists on surviving hyperinflation by planning ahead.

For Mike Mester, civil unrest is just round the corner and he is getting everyone ready; Colorado computer programmer Preston White has collected over 11,200 types of seeds and plans for biosphere living in a Fukushima radiated future while friends Shane and others provide supportive help; Riley Cook spends his days supporting the prepper society building underground structures.