Some preppers believe in safety in numbers -- as is the case for Jeff Mann, who leads "the Colony," a community of 25 preppers unified with the single purpose of surviving doomsday. Watch as he prepares his son, Colten, to take the reins by having him hunt down live boar in the Florida swamps and builds the Colony's very own gallows -- an important message that there are laws to be upheld, even in times of 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.

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.

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.

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.

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.

While many preppers believe defense is the best strategy for surviving a Doomsday scenario, one family in Tacoma, Wash., is banking on a good offense. Tyler, his wife and his cousin have assembled a group of like-minded, would-be marauders from their neighborhood in preparation for a catastrophic domestic terrorist attack. They have only six months' worth of food because they plan on taking what they need in order to survive — and to stay safe, they're developing the ultimate suit of armor.

A devastating EF-5 tornado, like the one that struck Oklahoma in May of this year, can throw buildings into the air and hurt hundreds of people. In Tennessee, Tracy is preparing for just that. Tracy has spent six years prepping his farm for a super tornado, but if it does hit, he doesn't plan on hunkering down — he plans on gathering his family and making a getaway in his mobile safe room.

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.

Meet two families who both fear the end of the world is fast approaching. In Texas, John Tucker and his family are preparing for Category 5 hurricanes that they believe will change the landscape forever. After living in a home that was split in two during a hurricane, John vowed he would never again be unprepared. And in Utah, brothers Bret and Shane are preparing for a complete economic collapse. To protect their families, they are building a sniper post complete with the ultimate sniper rifle.

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

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.

Meet two Tennessee families who are both preparing for an earthquake in the New Madrid Seismic Zone. David Mays believes all roads and bridges leading out of his neighborhood will be destroyed, so he's devising the ultimate Doomsday drone fleet. Meanwhile, 100 miles away, do-it-yourselfer David Nash is building a geodesic dome -- considered one of the most stable structures on earth as it eliminates the need for load-bearing walls -- that will house his family during the earthquake's aftermath.

n Georgia, Mark believes that the U.S. is under the threat of foreign occupation, specifically by Russia. He's building a modern Trojan horse in order to infiltrate a potential enemy base undetected. In Texas, Joe is preparing for a cyberattack to take out the country's telecommunications system. His current projects include a post-apocalyptic schoolhouse to be used to educate children if the government collapses after disaster and "gyro-copter" in order to maintain aerial dominance.

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.

Businessman by day, prepper by night. Brent lives in fear of an electromagnetic pulse (EMP) that will make the world go dark, leaving his family of 12 with nothing. To prep for life after the EMP, Brent has constructed a medieval-style castle that will serve as the ultimate bug-out fortress. Derek runs a Wild West theme park and fears that a solar flare will hit earth's atmosphere. He and his family use their amusement park as a secret prepping oasis, where they can practice strategic defense.

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.

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.

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.

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.

Martin Colvill lives on the road with his wife as a "survival trucker" and looks to prepare for the upcoming economic collapse; Donna Nash is prepared to quarantine all her family members to protect against a global pandemic; Kevin O'Brien is concerned about losing his home due to rising sea levels created by global warming or a polar shift.

James Patrick Douglas a man of the land in Maine shows off many needed homestead techniques to the viewers based upon overpopulation fears; Larry Hall the survival underground missile bunker builder invests in making sure his and other families are safe during any event; Becky Brown a gorgeous yet very inventive prepper (Grab n Go Food Storage) is making sure she and others are ready for martial law.

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.

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.

Bruce Beach a lifelong prepper is focused upon nuclear wars and saving children in his 42 underground buses; Jeremy and Kelly, are concerned parents in Salt Lake City, preparing for the collapse of society due to peak oil depletion; Bradford Frank of San Diego, California works around the clock in case of a worldwide pandemic that will end life as we know it.

John Major has gone to the extent of moving his family to Idaho for a better more natural lifestyle; Janet Spencer an author in Montana decided because of her location to prepare for any "unnatural" event; Jack & Jackie Jobe, although new to prepping have done quite well for their future survival.

Barry, Pink and Cole have the ultimate urban underground foxhole right in the garage. Hooray! one if the best we have seen; Steve Pace a hometown survivalists is ready to take on long term electric failure; Carolina resident Laura Kunzie has concerns to a rapid airborne flu outbreak and is preparing so.

Texas prepper "Dr Wayne" bases his doomsday fears on a Chinese financial takeover and he has prepared many ways to survive these events; John & Cristina Sellers, are both hardworking Americans who want to protect what they have; Jason & Tanya have done their homework on how life and prepping can happen on a budget.

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

Dennis McClung and we quote: "I'm preparing for a coronal mass ejection in 2012 that would likely take out the electrical grid and knock civilization back to the Stone Age."; Lisa Bedford takes urban preparation to a new level in case of a complete financial collapse; The Culver and Hunt families combine forces and have some of the best resources for self sustainability.

America's Doomsday plan. It's the government's ultimate playbook, with a strategy for even the darkest hours—developed when Cold War tensions were high, but never used until 9/11. In American Doomsday, fly in an E4-B—the president's command, control, and communications center for times of national catastrophe; go inside the secret bunker used by government officials on September 11; and witness how the luxurious Greenbrier Resort became a critical, top secret congressional bunker.