After the attack on Pearl Harbor, Japanese forces sweep across Southeast Asia; on Guadalcanal, United States Marines are given the bloody task of stopping their relentless advance.

A Delta Force operator deploys unparalleled skill in counterterrorism, hostage rescue, and covert operations; his ability to neutralize high-level threats makes the Delta Force operator a critical force in combating global terrorism.

Examine how America's battle to control the seas against the German U-boats in the Atlantic and Japan's navy in the Pacific turns the tide of the war.

After the attack on Pearl Harbor, Japanese forces sweep across Southeast Asia; on Guadalcanal, United States Marines are given the bloody task of stopping their relentless advance.

Lue Elizondo calls on a new technology to analyze a series of UFO videos, all recorded in 2019.

Mike journeys to an uninhabited island to hunt a herd of wild buffalo with help from the local natives; Lauro pushes himself training for the upcoming Iditarod with a grueling 260-mile run through the Alaskan wilderness.

Scientists study claims of a dead mermaid discovered and preserved in Japan; UFOs attracted to nuclear facilities; the glowing-eyed sea creature captured on video chasing a motorboat; a man who lived alone in the jungle.

Mike journeys to an uninhabited island to hunt a herd of wild buffalo with help from the local natives; Lauro pushes himself training for the upcoming Iditarod with a grueling 260-mile run through the Alaskan wilderness.

Buffalo re-enacts a WWII bombing in a DC-4; Devan discovers a hole in the C-46 mid-flight.

A storm delivers deadly driving conditions as the truckers struggle to deliver their loads.

Ken loses a machine when he can't afford to pay his debts and his crew; Big Al experiences more mechanical breakdowns; Dennis needs to quickly discover $10,000 worth of gold or get shut down.

Buffalo re-enacts a WWII bombing in a DC-4; Devan discovers a hole in the C-46 mid-flight.

A storm delivers deadly driving conditions as the truckers struggle to deliver their loads.

Ken loses a machine when he can't afford to pay his debts and his crew; Big Al experiences more mechanical breakdowns; Dennis needs to quickly discover $10,000 worth of gold or get shut down.

U.S. airline pilots are reporting near midair collisions with UFOs; Elizondo hears a never-told-before account from a major legacy airline pilot whose report of a glowing orange sphere while in the cockpit over Arizona is backed by photo evidence.

Tony Harris separates the real from the fake in some of the most compelling Bigfoot evidence recently captured; footprint casts from Mount St. Helens may be proof that a massive, undiscovered primate lives in North America.

In the absence of humanity, the world's cities like New York, Orlando and Rio de Janeiro are reclaimed by nature, as forests rise, animals roam free and fire and flood undo centuries of construction.

In the wake of the Civil War, American settlers flood into the Great Plains, seizing Native American land as they go; but the Lakota leader, Sitting Bull, alongside Crazy Horse, organizes an unprecedented resistance movement.

Lauro begins the longest Iditarod in the history of the famous sled dog race.

Tony Harris separates the real from the fake in some of the most compelling Bigfoot evidence recently captured; footprint casts from Mount St. Helens may be proof that a massive, undiscovered primate lives in North America.

U.S. airline pilots are reporting near midair collisions with UFOs; Elizondo hears a never-told-before account from a major legacy airline pilot whose report of a glowing orange sphere while in the cockpit over Arizona is backed by photo evidence.

In the absence of humanity, the world's cities like New York, Orlando and Rio de Janeiro are reclaimed by nature, as forests rise, animals roam free and fire and flood undo centuries of construction.

In the wake of the Civil War, American settlers flood into the Great Plains, seizing Native American land as they go; but the Lakota leader, Sitting Bull, alongside Crazy Horse, organizes an unprecedented resistance movement.

In the absence of humanity, the world's cities like New York, Orlando and Rio de Janeiro are reclaimed by nature, as forests rise, animals roam free and fire and flood undo centuries of construction.

In the wake of the Civil War, American settlers flood into the Great Plains, seizing Native American land as they go; but the Lakota leader, Sitting Bull, alongside Crazy Horse, organizes an unprecedented resistance movement.

U.S. airline pilots are reporting near midair collisions with UFOs; Elizondo hears a never-told-before account from a major legacy airline pilot whose report of a glowing orange sphere while in the cockpit over Arizona is backed by photo evidence.

Lauro begins the longest Iditarod in the history of the famous sled dog race.

Tony Harris separates the real from the fake in some of the most compelling Bigfoot evidence recently captured; footprint casts from Mount St. Helens may be proof that a massive, undiscovered primate lives in North America.

Lauro begins the longest Iditarod in the history of the famous sled dog race.

Chuck quits due to all the drama and Joe clashes with maintenance when a sale is delayed.

Darrell and Todd try to get through record-breaking snowfall, while the rest of the team fights to survive; despite frigid temperatures the war between VP Express and Polar reaches a boiling point.

Ken contends with a double mutiny; Cam's injured employee is airlifted to a hospital; Karl's crew encounters a bear.

Chuck quits due to all the drama and Joe clashes with maintenance when a sale is delayed.

Darrell and Todd try to get through record-breaking snowfall, while the rest of the team fights to survive; despite frigid temperatures the war between VP Express and Polar reaches a boiling point.

Ken contends with a double mutiny; Cam's injured employee is airlifted to a hospital; Karl's crew encounters a bear.

Lue identifies observable characteristics of UFOs.

A Chilean family believes they photographed a real UFO flying over the Andes Mountains; the images of a tall, dark, hairy creature walking through the forest could be proof that Ohio's legendary Grassman exists.

From the strict, brutal codes of Hammurabi and the Samurai to the secretly malevolent evil eye and Voodoo dolls, history is full of stories of acts committed in the name of revenge.

Sitting Bull and Crazy Horse face George Armstrong Custer and the Seventh Cavalry in the battle of Little Bighorn; when their triumph over the U.S. Army fails to end the war they must continue the fight to preserve the Lakota way of life.

Marty rebuilds a snowmobile from scratch before facing off with a wolverine menace on his trapline; Lauro feels the fatigue on the Iditarod trail and makes a wrong turn in the dark; Bret and Ivy ascend high into the Alaska Range to hunt Dall sheep.

A Chilean family believes they photographed a real UFO flying over the Andes Mountains; the images of a tall, dark, hairy creature walking through the forest could be proof that Ohio's legendary Grassman exists.

Lue identifies observable characteristics of UFOs.

From the strict, brutal codes of Hammurabi and the Samurai to the secretly malevolent evil eye and Voodoo dolls, history is full of stories of acts committed in the name of revenge.

Sitting Bull and Crazy Horse face George Armstrong Custer and the Seventh Cavalry in the battle of Little Bighorn; when their triumph over the U.S. Army fails to end the war they must continue the fight to preserve the Lakota way of life.

From the strict, brutal codes of Hammurabi and the Samurai to the secretly malevolent evil eye and Voodoo dolls, history is full of stories of acts committed in the name of revenge.

Sitting Bull and Crazy Horse face George Armstrong Custer and the Seventh Cavalry in the battle of Little Bighorn; when their triumph over the U.S. Army fails to end the war they must continue the fight to preserve the Lakota way of life.

Lue identifies observable characteristics of UFOs.

Marty rebuilds a snowmobile from scratch before facing off with a wolverine menace on his trapline; Lauro feels the fatigue on the Iditarod trail and makes a wrong turn in the dark; Bret and Ivy ascend high into the Alaska Range to hunt Dall sheep.

A Chilean family believes they photographed a real UFO flying over the Andes Mountains; the images of a tall, dark, hairy creature walking through the forest could be proof that Ohio's legendary Grassman exists.

Marty rebuilds a snowmobile from scratch before facing off with a wolverine menace on his trapline; Lauro feels the fatigue on the Iditarod trail and makes a wrong turn in the dark; Bret and Ivy ascend high into the Alaska Range to hunt Dall sheep.

When the C-46 has a hydraulic fluid leak on the valley run, Jimmy is forced to crawl into the.

The truckers battle a massive storm.

Ken's wife gets some surprising news when she arrives for a visit; Big Al has trouble with his excavator; Karl's season is threatened by permafrost.

When the C-46 has a hydraulic fluid leak on the valley run, Jimmy is forced to crawl into the.

The truckers battle a massive storm.

Ken's wife gets some surprising news when she arrives for a visit; Big Al has trouble with his excavator; Karl's season is threatened by permafrost.

There has been a legacy of secrecy and controversy surrounding UFOs and extraterrestrials, a look at these powerful leaders and could they be hiding the truth about UFOs from the public.

A faithful viewer captures the image of an alien probe; the identity of a strange creature captured by a camera at the entrance of a house; the legendary Men in Black call a man and threaten him; how a family survives a lightning bolt.

After a tumultuous week, the remaining survivalists continue to battle with settling into life in the Arctic; one participant gets their chance at big game, while another reaps the benefits of a well-placed trapline.

The survivalists grow comfortable in their surroundings, until the mountains signal a harsh shift ahead; as winter encroaches, one faces a dangerous predator encounter, while another begins to crack under the pressure.

Lauro barrels to the finish line of the Iditarod along the frozen Bering Sea coast; Mike fights to salvage his Kodiak Island homestead after a bear invasion; Chance makes a push into uncharted territory on his trapline; Jake corners a tomcat.

A faithful viewer captures the image of an alien probe; the identity of a strange creature captured by a camera at the entrance of a house; the legendary Men in Black call a man and threaten him; how a family survives a lightning bolt.

There has been a legacy of secrecy and controversy surrounding UFOs and extraterrestrials, a look at these powerful leaders and could they be hiding the truth about UFOs from the public.

After a tumultuous week, the remaining survivalists continue to battle with settling into life in the Arctic; one participant gets their chance at big game, while another reaps the benefits of a well-placed trapline.

The survivalists grow comfortable in their surroundings, until the mountains signal a harsh shift ahead; as winter encroaches, one faces a dangerous predator encounter, while another begins to crack under the pressure.

After a tumultuous week, the remaining survivalists continue to battle with settling into life in the Arctic; one participant gets their chance at big game, while another reaps the benefits of a well-placed trapline.

The survivalists grow comfortable in their surroundings, until the mountains signal a harsh shift ahead; as winter encroaches, one faces a dangerous predator encounter, while another begins to crack under the pressure.

There has been a legacy of secrecy and controversy surrounding UFOs and extraterrestrials, a look at these powerful leaders and could they be hiding the truth about UFOs from the public.

Lauro barrels to the finish line of the Iditarod along the frozen Bering Sea coast; Mike fights to salvage his Kodiak Island homestead after a bear invasion; Chance makes a push into uncharted territory on his trapline; Jake corners a tomcat.

A faithful viewer captures the image of an alien probe; the identity of a strange creature captured by a camera at the entrance of a house; the legendary Men in Black call a man and threaten him; how a family survives a lightning bolt.

Lauro barrels to the finish line of the Iditarod along the frozen Bering Sea coast; Mike fights to salvage his Kodiak Island homestead after a bear invasion; Chance makes a push into uncharted territory on his trapline; Jake corners a tomcat.

Reno Ward has a disastrous encounter with a speeding pick-up truck; Lisa Kelly attempts to rescue Reno but is forced to leave him to fend for himself; Art Burke attempts to deliver a Zamboni to save an isolated community's hockey season.

A big bump takes out Art Burke's radiator; Todd Dewey's rig lands in a snowbank; Steph Custance regrets her foray onto a wet ice crossing; Alex Debogorski uses a sled to drag a construction shack across a frozen lake.

Paid programming.

The Count takes a chance by building a low-rider with a Count's Kustoms twist; a businesswoman commissions the shop to surprise her husband with his very first bike.

Reno Ward has a disastrous encounter with a speeding pick-up truck; Lisa Kelly attempts to rescue Reno but is forced to leave him to fend for himself; Art Burke attempts to deliver a Zamboni to save an isolated community's hockey season.

A big bump takes out Art Burke's radiator; Todd Dewey's rig lands in a snowbank; Steph Custance regrets her foray onto a wet ice crossing; Alex Debogorski uses a sled to drag a construction shack across a frozen lake.

Dave and his daughter Alyssa struggle to recover a vintage ore cart from an abandoned copper mine; Angela struggles on what should be an easy job, and Dale goes on an epic hunt for furnace oil for Donny's shop.

A glimpse inside the maximum-security world of America's secret prisons as we unveil their hidden agendas and covert operations.

The Bloods will stop at nothing to fight back against their arch-nemesis, the Crips, making national headlines in the process.

Pablo Escobar's Medellín Cartel became powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

When Hispanic men see their membership to the Hells Angels denied, they form their own club: the Mongols Motorcycle Club; they clash with the Hells Angels and law enforcement.

America's deadliest prison gang, the Aryan Brotherhood, goes to war with anyone who stands in their way.

Whitey Bulger's notoriously violent and untouchable Winter Hill Gang are the kings of Boston's underworld, until a secret alliance comes to light.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

The Rollin' 60s Crips attempt to become the dominant street gang in Los Angeles regardless of the cost.

After the Cleveland Mafia bets big on Vegas, the city of Cleveland faces troubles when their boss suddenly dies.

A glimpse inside the maximum-security world of America's secret prisons as we unveil their hidden agendas and covert operations.

The Bloods will stop at nothing to fight back against their arch-nemesis, the Crips, making national headlines in the process.

Pablo Escobar's Medellín Cartel became powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

When Hispanic men see their membership to the Hells Angels denied, they form their own club: the Mongols Motorcycle Club; they clash with the Hells Angels and law enforcement.

America's deadliest prison gang, the Aryan Brotherhood, goes to war with anyone who stands in their way.

Whitey Bulger's notoriously violent and untouchable Winter Hill Gang are the kings of Boston's underworld, until a secret alliance comes to light.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

The Rollin' 60s Crips attempt to become the dominant street gang in Los Angeles regardless of the cost.

After the Cleveland Mafia bets big on Vegas, the city of Cleveland faces troubles when their boss suddenly dies.

A glimpse inside the maximum-security world of America's secret prisons as we unveil their hidden agendas and covert operations.

The Bloods will stop at nothing to fight back against their arch-nemesis, the Crips, making national headlines in the process.

Pablo Escobar's Medellín Cartel became powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

When Hispanic men see their membership to the Hells Angels denied, they form their own club: the Mongols Motorcycle Club; they clash with the Hells Angels and law enforcement.

America's deadliest prison gang, the Aryan Brotherhood, goes to war with anyone who stands in their way.

Whitey Bulger's notoriously violent and untouchable Winter Hill Gang are the kings of Boston's underworld, until a secret alliance comes to light.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

The Rollin' 60s Crips attempt to become the dominant street gang in Los Angeles regardless of the cost.

After the Cleveland Mafia bets big on Vegas, the city of Cleveland faces troubles when their boss suddenly dies.

Karl finds new gold with old maps; Nika and Chris find their first gold of the season; Bernie struggles to get started.

Big Al opens a new pit and Chris' dozer gets stuck; Karl struggles to find gold after a heavy rain; Bernie pushes his plant to its limit.

Paid programming.

Danny and Kevin visit Gordon to see his latest insane creation; Danny tries to turn a 34 Ford into a white hot-hot rod.

Karl finds new gold with old maps; Nika and Chris find their first gold of the season; Bernie struggles to get started.

Big Al opens a new pit and Chris' dozer gets stuck; Karl struggles to find gold after a heavy rain; Bernie pushes his plant to its limit.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services; alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

While the Boston underworld was in chaos in the 1970s, Whitey Bulger schemed and killed his way through the ranks to become the most famous gangster in Boston history as well as the subject of the longest manhunt in U.S. history.

In the 1980s New York, two opposing factions of the American Mafia split the Gambino crime family down the middle; the old school and the new school struggle against one another; one murderous capo emerges as the Boss of Bosses.

In the 1990s, three violent cartels battled for control of the Mexican drug world; one brutally ambitious Narco, known as El Chapo, rose above the rest to create one unified cartel, and become the most powerful criminal in Mexico's history.

In the 1970s in Colombia, a petty thief rises to become the most powerful criminal in history, unleashing a bloody reign of terror to create the first global drug cartel and become the first billionaire kingpin of the 20th century.

While the Boston underworld was in chaos in the 1970s, Whitey Bulger schemed and killed his way through the ranks to become the most famous gangster in Boston history as well as the subject of the longest manhunt in U.S. history.

In the 1980s New York, two opposing factions of the American Mafia split the Gambino crime family down the middle; the old school and the new school struggle against one another; one murderous capo emerges as the Boss of Bosses.

In the 1990s, three violent cartels battled for control of the Mexican drug world; one brutally ambitious Narco, known as El Chapo, rose above the rest to create one unified cartel, and become the most powerful criminal in Mexico's history.

In the 1970s in Colombia, a petty thief rises to become the most powerful criminal in history, unleashing a bloody reign of terror to create the first global drug cartel and become the first billionaire kingpin of the 20th century.

While the Boston underworld was in chaos in the 1970s, Whitey Bulger schemed and killed his way through the ranks to become the most famous gangster in Boston history as well as the subject of the longest manhunt in U.S. history.

Duane begs Chuck to come back when a gasoline shortage happens in Yellowknife.

Hugh has a plan to crush the competition; Todd and Lisa are pressured to up their game.

Dennis' hunt for gold proves unsuccessful; Ken breaks a machine in his haste to sluice; Karl's season is threatened by floods.

Duane begs Chuck to come back when a gasoline shortage happens in Yellowknife.

Hugh has a plan to crush the competition; Todd and Lisa are pressured to up their game.

Dennis' hunt for gold proves unsuccessful; Ken breaks a machine in his haste to sluice; Karl's season is threatened by floods.

A pilot activates his ejector seat at the last second during a rocky landing; a motorist tries to escape a forest full of falling trees; the Hindenburg, the pride of Nazi Germany, explodes in flames while flying over New Jersey in 1937.

A silver orb in the sky, and alleged crash debris may be from a UFO; a 65-year-old-man might have some of the fastest hands in the West; an infamous spy organization's alleged footage of UFOs and aliens.

Turtlemania hits the shop when a seller tries to pawn a 1991 Teenage Mutant Ninja Turtles action figure and prototype; Rick heads to the gun range to test out a deadly 1800s.

While cruising through Southern California on a special mission for Danielle, Mike uncovers a legendary signed guitar along with story boards and scripts from one of America's favorite cartoon family, the Simpsons.

Unveiling notorious artifacts from crime history that made a killing on the auction block.

Lauro embarks on a new solo adventure with his dog team across the unforgiving Arctic wilderness.

A silver orb in the sky, and alleged crash debris may be from a UFO; a 65-year-old-man might have some of the fastest hands in the West; an infamous spy organization's alleged footage of UFOs and aliens.

A pilot activates his ejector seat at the last second during a rocky landing; a motorist tries to escape a forest full of falling trees; the Hindenburg, the pride of Nazi Germany, explodes in flames while flying over New Jersey in 1937.

Turtlemania hits the shop when a seller tries to pawn a 1991 Teenage Mutant Ninja Turtles action figure and prototype; Rick heads to the gun range to test out a deadly 1800s.

While cruising through Southern California on a special mission for Danielle, Mike uncovers a legendary signed guitar along with story boards and scripts from one of America's favorite cartoon family, the Simpsons.

Unveiling notorious artifacts from crime history that made a killing on the auction block.

Turtlemania hits the shop when a seller tries to pawn a 1991 Teenage Mutant Ninja Turtles action figure and prototype; Rick heads to the gun range to test out a deadly 1800s.

While cruising through Southern California on a special mission for Danielle, Mike uncovers a legendary signed guitar along with story boards and scripts from one of America's favorite cartoon family, the Simpsons.

Unveiling notorious artifacts from crime history that made a killing on the auction block.

A pilot activates his ejector seat at the last second during a rocky landing; a motorist tries to escape a forest full of falling trees; the Hindenburg, the pride of Nazi Germany, explodes in flames while flying over New Jersey in 1937.

Lauro embarks on a new solo adventure with his dog team across the unforgiving Arctic wilderness.

A silver orb in the sky, and alleged crash debris may be from a UFO; a 65-year-old-man might have some of the fastest hands in the West; an infamous spy organization's alleged footage of UFOs and aliens.

Lauro embarks on a new solo adventure with his dog team across the unforgiving Arctic wilderness.

Duane lands a huge contract; Adam must work without Chuck.

With temperatures on the rise, conditions on the ice roads result in meltdown. The truckers from Polar and VP Express are pushed to the limit, crossing thin ice on their way to deliver critical loads.

Ken takes a roll in his bulldozer; beavers threaten Big Al's operation; Karl's loader springs a leak.

Duane lands a huge contract; Adam must work without Chuck.

With temperatures on the rise, conditions on the ice roads result in meltdown. The truckers from Polar and VP Express are pushed to the limit, crossing thin ice on their way to deliver critical loads.

Ken takes a roll in his bulldozer; beavers threaten Big Al's operation; Karl's loader springs a leak.

A construction worker is caught out on the ledge of a burning building; a humpback whale swallows two kayakers alive; a truck driver narrowly escapes his vehicle before it gets hit by an oncoming train.

Why are the historic McMinnville photos, captured nearly 75 years ago, still considered to be credible and compelling proof for the existence of UFOs?; did a camera capture signs of paranormal activity in an office?; can this elephant speak Korean?

The Templar Knights of the 12th century build some of history's greatest warriors through elite training in the Holy Land, combining religious devotion with extraordinary combat skills.

As Hitler's reach extends beyond Germany and darkness descends on Europe, his hateful rhetoric leads to anti-Jewish persecution and ultimately, genocide.

The first joint U.S.-British offensive of the war, thousands of inexperienced U.S. troops and their untested leader Eisenhower, face off against the hardened German Afrika Korps and the infamous Field Marshal Erwin Rommel.

Tom goes for one final ride on the trapline to pull his last sets before passing the torch to Sean and Hank; Jake has a showdown for the ages when three lions are cornered in a single tree.

Why are the historic McMinnville photos, captured nearly 75 years ago, still considered to be credible and compelling proof for the existence of UFOs?; did a camera capture signs of paranormal activity in an office?; can this elephant speak Korean?

A construction worker is caught out on the ledge of a burning building; a humpback whale swallows two kayakers alive; a truck driver narrowly escapes his vehicle before it gets hit by an oncoming train.

The Templar Knights of the 12th century build some of history's greatest warriors through elite training in the Holy Land, combining religious devotion with extraordinary combat skills.

As Hitler's reach extends beyond Germany and darkness descends on Europe, his hateful rhetoric leads to anti-Jewish persecution and ultimately, genocide.

The first joint U.S.-British offensive of the war, thousands of inexperienced U.S. troops and their untested leader Eisenhower, face off against the hardened German Afrika Korps and the infamous Field Marshal Erwin Rommel.

The Templar Knights of the 12th century build some of history's greatest warriors through elite training in the Holy Land, combining religious devotion with extraordinary combat skills.

As Hitler's reach extends beyond Germany and darkness descends on Europe, his hateful rhetoric leads to anti-Jewish persecution and ultimately, genocide.

The first joint U.S.-British offensive of the war, thousands of inexperienced U.S. troops and their untested leader Eisenhower, face off against the hardened German Afrika Korps and the infamous Field Marshal Erwin Rommel.

A construction worker is caught out on the ledge of a burning building; a humpback whale swallows two kayakers alive; a truck driver narrowly escapes his vehicle before it gets hit by an oncoming train.

Tom goes for one final ride on the trapline to pull his last sets before passing the torch to Sean and Hank; Jake has a showdown for the ages when three lions are cornered in a single tree.

Why are the historic McMinnville photos, captured nearly 75 years ago, still considered to be credible and compelling proof for the existence of UFOs?; did a camera capture signs of paranormal activity in an office?; can this elephant speak Korean?

Tom goes for one final ride on the trapline to pull his last sets before passing the torch to Sean and Hank; Jake has a showdown for the ages when three lions are cornered in a single tree.

Adam and Duane are forced to work things out on a flight to Alert, Earth's northernmost settlement.

Lisa and Todd take on one of the toughest runs of the season; Darrell steals business from his former boss; Alex's trucking season is threatened by a crash.

Ken battles frigid conditions and disappointing returns; an ancient waterfall proves problematic to Cam; Karl's mechanical skills are put to the test.

Adam and Duane are forced to work things out on a flight to Alert, Earth's northernmost settlement.

Lisa and Todd take on one of the toughest runs of the season; Darrell steals business from his former boss; Alex's trucking season is threatened by a crash.

Ken battles frigid conditions and disappointing returns; an ancient waterfall proves problematic to Cam; Karl's mechanical skills are put to the test.

Skydivers narrowly escape two colliding planes; a father and son are in danger as they drive through a raging wildfire; what to do and what not to do when stalked by a cougar.

A photograph of a UFO hovering over Holloman Air Force Base in New Mexico; a cabin built in a supposedly anomalous spot that defies gravity in the Redwood Forests; the origin of frightening howls recorded in Witset, British Columbia.

When humanity vanishes, the vast and fragile infrastructure hidden underground-from subways and pipelines to one of the big coal seams in the United States-begins to unravel.

Recent discoveries of previously unknown hominids and breakthroughs in genetic technology give Bigfoot believers new hope that the creature will be found; asking if America is prepared for doomsday; America's only unsolved airplane hijacking.

Tom Oar shares his hard-earned survival secrets forged through a lifetime of experience living in the wild.

A photograph of a UFO hovering over Holloman Air Force Base in New Mexico; a cabin built in a supposedly anomalous spot that defies gravity in the Redwood Forests; the origin of frightening howls recorded in Witset, British Columbia.

Skydivers narrowly escape two colliding planes; a father and son are in danger as they drive through a raging wildfire; what to do and what not to do when stalked by a cougar.

When humanity vanishes, the vast and fragile infrastructure hidden underground-from subways and pipelines to one of the big coal seams in the United States-begins to unravel.

Recent discoveries of previously unknown hominids and breakthroughs in genetic technology give Bigfoot believers new hope that the creature will be found; asking if America is prepared for doomsday; America's only unsolved airplane hijacking.

When humanity vanishes, the vast and fragile infrastructure hidden underground-from subways and pipelines to one of the big coal seams in the United States-begins to unravel.

Recent discoveries of previously unknown hominids and breakthroughs in genetic technology give Bigfoot believers new hope that the creature will be found; asking if America is prepared for doomsday; America's only unsolved airplane hijacking.

Skydivers narrowly escape two colliding planes; a father and son are in danger as they drive through a raging wildfire; what to do and what not to do when stalked by a cougar.

Tom Oar shares his hard-earned survival secrets forged through a lifetime of experience living in the wild.

A photograph of a UFO hovering over Holloman Air Force Base in New Mexico; a cabin built in a supposedly anomalous spot that defies gravity in the Redwood Forests; the origin of frightening howls recorded in Witset, British Columbia.

Tom Oar shares his hard-earned survival secrets forged through a lifetime of experience living in the wild.

Joe finds out that Gord has taken a job with a rival airline; while training on the C-46, Larry makes a near fatal error.

Darrell's calls in a surprising reinforcement; but can this new team member hack the treacherous ice roads; Hugh has a brush with near disaster.

Ken needs a lifeline in order to salvage his season; Cam encounters a dangerous wall of ice; Big Al's dozer breaks down.

Joe finds out that Gord has taken a job with a rival airline; while training on the C-46, Larry makes a near fatal error.

Darrell's calls in a surprising reinforcement; but can this new team member hack the treacherous ice roads; Hugh has a brush with near disaster.

Ken needs a lifeline in order to salvage his season; Cam encounters a dangerous wall of ice; Big Al's dozer breaks down.

A dad leaps into action to save an animal handler from an alligator attack; two vintage military aircraft collide at an air show in Dallas.

A security camera in Youngstown captures a strange creature in Ohio; a Proof viewer may have filmed the infamous Black Knight satellite; the source of a sound so loud it could be heard across the Equatorial Pacific Ocean.

Legendary beasts are believed to roam the earth and the seas, terrorizing, killing, and even possessing humans; but are these creatures merely metaphors or is there proof they've actually been unleashed to wreak havoc?

Every day, ordinary Americans are lured away from their normal lives by cults, drugs, and criminal organizations.

On September 11, 2001, Americans' sense of security gets severely shaken; but what are the most dangerous threats to the United States of America, both foreign and domestic?