HSI finds cocaine hidden in frozen avocado paste; CBP recovers stolen cars.

CBP in McAllen faces a possible bomb; HSI arrests fentanyl traffickers.

A 48-hour sting leads HSI to a stash house; CBP finds drugs in gas tanks.

HSI tails vehicle transporting meth; CBP seizes looted Ukrainian relics.

A dentist from Kiev hopes for an extended stay in the U.S. after fleeing war in her home country; at the Detroit Border, a case of mistaken identity causes alarm; in Chicago, a metaphysical healer wishes a CBP officer good vibes.

A dentist from Kiev hopes for an extended stay in the U.S. after fleeing war in her home country; a traveler headed to Vegas points to a friend as the source of the extra cash he's carrying.

A Canadian landscaper forgets to tell CBP about his imminent flight; a trucker's day goes sideways when he makes a wrong turn and ends up at the border; at Chicago O'Hare a traveler is irate when he's taken to secondary.

A traveler with bags full of counterfeit merchandise isn't bothered by CBP's probing questions; a woman crossing the border finds herself in a salty situation; a journalist hoping to visit the US on vacation is interviewed about his work prospects.

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

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.

The fundamental creation of the wheel helps shape the human experience, but if the wheel suddenly stopped working and society lost the greatest, game-changing accomplishments made using wheel technology, the world would be vastly different.

A dentist from Kiev hopes for an extended stay in the U.S. after fleeing war in her home country; at the Detroit Border, a case of mistaken identity causes alarm; in Chicago, a metaphysical healer wishes a CBP officer good vibes.

A dentist from Kiev hopes for an extended stay in the U.S. after fleeing war in her home country; a traveler headed to Vegas points to a friend as the source of the extra cash he's carrying.

A Canadian landscaper forgets to tell CBP about his imminent flight; a trucker's day goes sideways when he makes a wrong turn and ends up at the border; at Chicago O'Hare a traveler is irate when he's taken to secondary.

A traveler with bags full of counterfeit merchandise isn't bothered by CBP's probing questions; a woman crossing the border finds herself in a salty situation; a journalist hoping to visit the US on vacation is interviewed about his work prospects.

Mariana van Zeller investigates a dark and very elusive black market, the illicit trade in human organs.

LSD is booming because of the growing faith in its healing power; Mariana hunts for the elusive chemists responsible for making the world's supply.

Mariana exposes the dangers of the growing and deadly ghost guns industry.

Mariana goes on a mission to understand how personal and financial data is stolen and sold by a shadowy network of hackers and thieves.

Enhanced: Mariana follows the booming MDMA supply chain.

Violent crime soars in Los Angeles to levels not seen in 30 years; Mariana journeys into gangland to understand the violence plaguing the city.

Mariana embarks on a journey from Africa to the Middle East to investigate how black-market oil is fueling terrorist groups worldwide.

Mariana embeds with a crew of crypto scammers who show her how they make millions of dollars in mere weeks.

Experts shed light on the United Airlines Flight 232 crash as survivors share their firsthand accounts.

Mariana investigates underground fight clubs and the push to bring bare-knuckle fighting into the mainstream.

Mariana embeds with a crew of crypto scammers who show her how they make millions of dollars in mere weeks.

Experts shed light on the United Airlines Flight 232 crash as survivors share their firsthand accounts.

Mariana investigates underground fight clubs and the push to bring bare-knuckle fighting into the mainstream.

Mariana van Zeller investigates a dark and very elusive black market, the illicit trade in human organs.

LSD is booming because of the growing faith in its healing power; Mariana hunts for the elusive chemists responsible for making the world's supply.

Mariana exposes the dangers of the growing and deadly ghost guns industry.

Mariana goes on a mission to understand how personal and financial data is stolen and sold by a shadowy network of hackers and thieves.

Two women returning from a tropical vacation are questioned; at JFK cargo facility, a bounty of gold jewelry is apprehended when the manifesto seems to sell its value short; Baily the dog has a big day.

A traveler headed to Vegas rolls the dice on getting into the US for a vacation; a family immigrating from Vietnam hope their enthusiasm translates; at JFK cargo facility, boxes of pancake mix fall flat.

A man from Mexico is questioned when it is indicated his vacation plans may include a work component; at JFK cargo facility a shipment of live moth pupas is put under the microscope; in San Francisco, an angry traveler points a finger at CBP.

A couple and their girlfriend, with a loaded weapon on board, reach the border by mistake; in San Francisco, a man wandering aimlessly around the airport after his flight arrives is questioned about the contents of his luggage.

Ken must make his way up Moose Creek's treacherous road in a desperate attempt to get fuel; Karl has major problems with his sluice; Big Al's stripping dozer goes down for the count.

The Dawson City Fire Department struggles in the absence of their chief; Ray is stuck in deep snow on a remote backroad and Colin races against an incoming storm to keep the travelling public safe.

Exploring what the world would be like if salt and all of its vital contributions, from food preservation to enabling industry, were to suddenly disappear.

Two women returning from a tropical vacation are questioned; at JFK cargo facility, a bounty of gold jewelry is apprehended when the manifesto seems to sell its value short; Baily the dog has a big day.

A traveler headed to Vegas rolls the dice on getting into the US for a vacation; a family immigrating from Vietnam hope their enthusiasm translates; at JFK cargo facility, boxes of pancake mix fall flat.

A man from Mexico is questioned when it is indicated his vacation plans may include a work component; at JFK cargo facility a shipment of live moth pupas is put under the microscope; in San Francisco, an angry traveler points a finger at CBP.

A couple and their girlfriend, with a loaded weapon on board, reach the border by mistake; in San Francisco, a man wandering aimlessly around the airport after his flight arrives is questioned about the contents of his luggage.

Alaskans confront brutal elements while on the hunt for critical resources.

Alaskans engineer inventive solutions for survival in the harsh elements.

With surprises around every bend, Alaskans must be ready for anything.

Alaskans brave the deadly cold of winter to protect their way of life.

The next generation must be resourceful tackling late winter challenges.

The next generation of Alaskans risk it all to ensure their survival.

Alaskans must push their boundaries in hopes of a prosperous future.

As the seasons change, the next generation must adapt in order to survive.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

Jo Roger and Ole Henrik struggle to rescue a trailer load of salt that threatens to pollute Norways biggest salmon river.

As the seasons change, the next generation must adapt in order to survive.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

Jo Roger and Ole Henrik struggle to rescue a trailer load of salt that threatens to pollute Norways biggest salmon river.

Alaskans confront brutal elements while on the hunt for critical resources.

Alaskans engineer inventive solutions for survival in the harsh elements.

With surprises around every bend, Alaskans must be ready for anything.

Alaskans brave the deadly cold of winter to protect their way of life.

Officers question a man from Texas who arrives with his hunting equipment.

A Dutch woman with a lot of luggage claims she's on a four-day holiday; a Chinese parcel contains a shocking surprise; actor Corey Feldman shows up.

An angry businessman hides the real reason for his hostility; officers try to process some unusual Mexican migrants.

Officers drill an American oil worker with a shady past; a British traveler's proposed reunion with a girlfriend could be cut short.

Ken and Guillaume travel over a dangerous mountain pass; Cam worries about getting Gary into the country; Nina and Chris have a difficult start to their season.

The Yukon's Civil Air Search and Rescue Association battles flying conditions in their search for a historic missing plane that had 44 people on board; the Dawson City Fire Department responds to a 911 call that puts the town in jeopardy.

The world is literally buzzing with insects; bees, spiders and insects of all shapes and sizes touch every aspect of life, they're the essential workers that pollinate food, clean up the dead and are an integral part of the ecosystem.

Officers question a man from Texas who arrives with his hunting equipment.

A Dutch woman with a lot of luggage claims she's on a four-day holiday; a Chinese parcel contains a shocking surprise; actor Corey Feldman shows up.

An angry businessman hides the real reason for his hostility; officers try to process some unusual Mexican migrants.

Officers drill an American oil worker with a shady past; a British traveler's proposed reunion with a girlfriend could be cut short.

The staffers become the clients when several of their pets fall ill.

The clinic works together to create an extra special surprise for Diane.

The Pols need to fix the sheep hut before winter arrives.

Everything feels connected as the vets see patterns emerge in their cases.

The clinic braces for a snowstorm as Doc races to an emergency farm call.

A muskrat attack sends a dog to the vet; Dr. Nicole has exciting news.

Spring brings a baby boom of goats, reindeer, and puppies to the clinic.

Dr. Pol and Charles cook up a special treat for Mother's Day.

The filmmakers analyze behavioral and physical facets of predators and the strategies they use to survive in the wild and outfox their opponents.

A documentary-style look into the personal lives of the country vets.

Dr. Pol and Charles cook up a special treat for Mother's Day.

The filmmakers analyze behavioral and physical facets of predators and the strategies they use to survive in the wild and outfox their opponents.

A documentary-style look into the personal lives of the country vets.

The staffers become the clients when several of their pets fall ill.

The clinic works together to create an extra special surprise for Diane.

The Pols need to fix the sheep hut before winter arrives.

Everything feels connected as the vets see patterns emerge in their cases.

A sloshed snowboarder causes trouble at the airport; a pair of packages add up to a deadly surprise.

A bad-tempered drill worker returning home from Japan goes one step too far with officers; a Californian woman hides something in her child's stroller.

A Korean bride-to-be tries to enter Canada as a tourist; the Marine Enforcement Team tackles a massive Japanese freighter carrying an illegal passenger.

Officers suspect an IT consultant has arrived for more than just a holiday; a surfer returns from Southeast Asia with a strange souvenir.

Cam takes a risk on a pricey water cannon; a piece breaks on Karl's sluice plant; Ken and Guillaume test for gold.

The Dawson City Fire Department races to protect the town from devastating flash floods; officers track down a dangerous and destructive bison herd, have a run-in with a bear and set up a sting to catch a suspected serial over-fisher.

Examining the history of cats and dogs and how they have been helpful companions to humankind all over the globe.

A sloshed snowboarder causes trouble at the airport; a pair of packages add up to a deadly surprise.

A bad-tempered drill worker returning home from Japan goes one step too far with officers; a Californian woman hides something in her child's stroller.

A Korean bride-to-be tries to enter Canada as a tourist; the Marine Enforcement Team tackles a massive Japanese freighter carrying an illegal passenger.

Officers suspect an IT consultant has arrived for more than just a holiday; a surfer returns from Southeast Asia with a strange souvenir.

Archaeologists unearth new clues about a forgotten dynasty, the Sun Kings.

Archaeologists investigate Egypt's last legendary Queen, Cleopatra.

New discoveries reveal the secrets of Roman gladiators' enduring appeal.

Archaeologists dig in Pompeii to uncover the dark side of the idyllic Roman city by finding the room of an enslaved person.

Archaeologists reveal the discovery of a Nero megastructure.

Discoveries uncover how the Romans ruled the seas for four centuries.

Archaeologists excavate a buried city in Jordan, dive a sunken temple in Italy and explore Petra to shed new light on how Rome conquered the east.

Archaeologists excavate the vast frontier of the Roman Empire, investigating the battle to keep it safe.

In this enhanced episode, Border Patrol chases a suspect fleeing arrest.

Port Protection's canine community takes center stage.

Archaeologists excavate the vast frontier of the Roman Empire, investigating the battle to keep it safe.

In this enhanced episode, Border Patrol chases a suspect fleeing arrest.

Port Protection's canine community takes center stage.

Archaeologists unearth new clues about a forgotten dynasty, the Sun Kings.

Archaeologists investigate Egypt's last legendary Queen, Cleopatra.

New discoveries reveal the secrets of Roman gladiators' enduring appeal.

Archaeologists dig in Pompeii to uncover the dark side of the idyllic Roman city by finding the room of an enslaved person.

Lisa Kelly and Steph Custance team up for a challenging passage on the icy terrain; Art Burke brings a split load into the north country, hoping this will be his last load of the year; Todd Dewey hauls a double oversized camp shack.

Cam and his crew hurry to begin sluicing Donovan cut; Karl motivates his crew; Chris and Nika face a sluice plant breakdown.

The Inland Enforcement Team track down an alleged German sex offender; a detector dog sniffs out trouble in an unclaimed suitcase from Dubai.

Cam and his crew hurry to begin sluicing Donovan cut; Karl motivates his crew; Chris and Nika face a sluice plant breakdown.

In this special episode, Cesar helps three pandemic pups with big problems.

Cesar helps two families with big problems.

Cesar helps three families with quirky pups.

Cesar helps two families with disrespectful pups.

In this special episode, Cesar helps two families with pairs of hyper pups.

In this special episode, Cesar helps three families with doggie dilemmas.

In this special episode, Cesar helps two pups with scared pet parents.

Cesar rehabs an overprotective Belgian Malinois and a puppy with no leadership.

A pet parent unknowingly trains his pit bull to attack cleaning objects.

Cesar rehabs a sound sensitive sheepdog and a confused golden retriever.

Cesar helps a back-of-the-pack biter and his pet parent shed their fear.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a back-of-the-pack biter and his pet parent shed their fear.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

In this special episode, Cesar helps three pandemic pups with big problems.

Cesar helps two families with big problems.

Cesar helps three families with quirky pups.

Cesar helps two families with disrespectful pups.

Drivers head out one last time during the spring thaw; Steph Custance slides into trees; Todd Dewey struggles with a load on a twisty trail; Art Burke retrieves a heavy bulldozer; Reno Ward's truck dies on the ice; Lisa Kelly gets an emergency call.

Gold, the shiny precious metal that has been cherished through all recorded time, is vital to the modern world; if gold was suddenly stripped away, the technological and cultural world would be left reeling.

Drivers head out one last time during the spring thaw; Steph Custance slides into trees; Todd Dewey struggles with a load on a twisty trail; Art Burke retrieves a heavy bulldozer; Reno Ward's truck dies on the ice; Lisa Kelly gets an emergency call.

Gold, the shiny precious metal that has been cherished through all recorded time, is vital to the modern world; if gold was suddenly stripped away, the technological and cultural world would be left reeling.

Conservation Officer Logan has a close call while investigating a case of poaching; an aggressive grizzly bear ransacks a remote trapper's cabin.

AMO seizes over 280 kilos of cocaine and $750,000 from smuggling vessels.

Caribbean AMO agents bust a smuggling ring and seize 1300 kilos of cocaine.

HSI arrests 37 gang members; AMO seizes $5.4 million worth of cocaine.

HSI arrests drug traffickers; AMO seizes $13.2 million of coke on a beach.

AMO seizes over $60 million of cocaine out at sea.

AMO seizes $8 million of coke; HSI foils a port smuggling operation.

AMO discovers over 80 kilos of cocaine washed ashore in St. Thomas.

A high speed chase ending in the BVI lands AMO 1,800 kilos of coke.

The department finds boats in Puerto Rico containing 350 kg of coke and multiple guns.

A pursuit off the coast off Vieques ends by seizing 907 kg of cocaine.

Marcus Attilius, citizen-turned-gladiator, fights for survival in Pompeii.

Rediscovering the true legacies of queens Cleopatra, Nefertiti and Hatshepsut.

A pursuit off the coast off Vieques ends by seizing 907 kg of cocaine.

Marcus Attilius, citizen-turned-gladiator, fights for survival in Pompeii.

Rediscovering the true legacies of queens Cleopatra, Nefertiti and Hatshepsut.

AMO seizes over 280 kilos of cocaine and $750,000 from smuggling vessels.

Caribbean AMO agents bust a smuggling ring and seize 1300 kilos of cocaine.

HSI arrests 37 gang members; AMO seizes $5.4 million worth of cocaine.

HSI arrests drug traffickers; AMO seizes $13.2 million of coke on a beach.

A Canadian wanted in Alberta is stopped en route to Ecuador; a parcel of baby food contains surprising ingredients.

A Russian dissident's complicated past raises questions for officers; a Korean tourist's resume and school diplomas raise eyebrows.

The Inland Enforcement Unit tracks a pair of Honduran drug runners; an American tourist seems to have already put down roots in Canada.

Trouble looms for a young Asian woman carrying someone else's bag, and a pair of Canadians return from a concert in California with more than a T-shirt.

With the biggest storm in centuries only a few days away, the truckers race for loads; Art and Todd set out to prove themselves.

An old map connected to testimony from an 1891 eyewitness account of Slumach's hanging sheds light on the legend.

When a bear charges a group of remote researchers, a Conservation Officer deals with the potentially life-threatening situation, and Ray takes on a challenging recovery that bested two tow companies before him.

A Canadian wanted in Alberta is stopped en route to Ecuador; a parcel of baby food contains surprising ingredients.

A Russian dissident's complicated past raises questions for officers; a Korean tourist's resume and school diplomas raise eyebrows.

The Inland Enforcement Unit tracks a pair of Honduran drug runners; an American tourist seems to have already put down roots in Canada.

Trouble looms for a young Asian woman carrying someone else's bag, and a pair of Canadians return from a concert in California with more than a T-shirt.

Curly's deer hunt comes to a thrilling end with a shot gone awry; Sam, Troy and Terry struggle with uneven ground to build Troy a bathroom.

Eager to prove herself, Breanna splits from Oliver in search of deer; Terry helps Troy and Sarah while Squibb attacks Veronica's parking problem.

With big plans for the future, Oliver sets out to bring home some massive cedar trees that will help him turn his float house home into a kingdom.

Sam's desire to silence his generators ignites a fire that threatens to burn his house to the ground.

Squibb and Troy repair a sinking float that could cause a massive oil spill.

As the community of Port Protection springs forward, Squibb and Troy join forces to repair a sinking float that could cause a massive oil spill.

Sam's youngest son returns, as Veronica learns the basics.

Novice Veronica Arrants risks life and limb to repair the town phone line.

New drug trafficking strategies include stashes anchored to the seabed and narco-submarines.

Novice Veronica Arrants risks life and limb to repair the town phone line.

Curly takes advantage of a break between storms to hunt for deer.

New drug trafficking strategies include stashes anchored to the seabed and narco-submarines.

Curly's deer hunt comes to a thrilling end with a shot gone awry; Sam, Troy and Terry struggle with uneven ground to build Troy a bathroom.

Eager to prove herself, Breanna splits from Oliver in search of deer; Terry helps Troy and Sarah while Squibb attacks Veronica's parking problem.

With big plans for the future, Oliver sets out to bring home some massive cedar trees that will help him turn his float house home into a kingdom.

Sam's desire to silence his generators ignites a fire that threatens to burn his house to the ground.

A street performer is caught in the middle of an escape act; a cheeky bus passenger answers questions about his mischievous past.

A distinctive bag has officers seeing double; a photographer misses the big picture; a heavily-modified truck causes concern.

A traveler's textbooks teach him an unexpected lesson; a tourist hits a snag instead of the slopes; officers inspect a shipment of cosmetics.

Officers add charges to a woman's lengthy rap sheet and stumble upon a hair-raising package from Malaysia.

The truckers race to deliver their loads while a massive storm approaches; Lisa and Art face a deadly shutdown; Darrell and Todd's feud threatens to rip team Polar apart.

A recurring mine marker points the team east to neighboring Harrison Lake as leads and legend line up; clues found in a 1950s article by an investigative reporter place a lost Spanish gold mine directly on Slumach's path.

Frigid temperatures wreak havoc on Dawson City, putting the fire department in danger; an avalanche shuts down the Klondike Highway and a tow operator races to find a driver who has plunged off-road and into an icy river.

A street performer is caught in the middle of an escape act; a cheeky bus passenger answers questions about his mischievous past.

A distinctive bag has officers seeing double; a photographer misses the big picture; a heavily-modified truck causes concern.

A traveler's textbooks teach him an unexpected lesson; a tourist hits a snag instead of the slopes; officers inspect a shipment of cosmetics.

Officers add charges to a woman's lengthy rap sheet and stumble upon a hair-raising package from Malaysia.

Mariana explores the global surrogacy market to understand how the dream of starting a family is fueling a babies-for-cash black market.

Mariana tracks the illicit path of hashish from Morocco into Europe; a world of shadowy dealers, fast smuggling boats and endless wealth.

Health care costs have pushed millions of Americans to the black market.

Mariana goes inside the dangerous, high-stakes world of illegal gambling to try and understand its allure, its growth and its dark side.

Mariana heads to the Congo to investigate the illegal trading of wild apes that has apes on the brink of extinction.

The trafficking of human remains yields billions of dollars globally and remains clandestine; Mariana's investigation reveals the vulnerability of anyone to human remains trafficking.

Mariana heads to Mexico to investigate the billion-dollar business of people-smuggling to the U.S., a system fueled by cartels and corruption.

Mariana goes inside the world of contract killers.

US Airways Flight 1549 takes off from New York City's LaGuardia Airport when it collides with a flock of birds, destroying both engines.

Mariana delves into a new scheme called sextortion, where compromising photos are used to extort victims; while searching for the scammer who targeted a young American, she uncovers a scam culture even more terrifying than she had imagined.

Mariana goes inside the world of contract killers.

US Airways Flight 1549 takes off from New York City's LaGuardia Airport when it collides with a flock of birds, destroying both engines.

Mariana delves into a new scheme called sextortion, where compromising photos are used to extort victims; while searching for the scammer who targeted a young American, she uncovers a scam culture even more terrifying than she had imagined.

Mariana explores the global surrogacy market to understand how the dream of starting a family is fueling a babies-for-cash black market.

Mariana tracks the illicit path of hashish from Morocco into Europe; a world of shadowy dealers, fast smuggling boats and endless wealth.

Health care costs have pushed millions of Americans to the black market.

Mariana goes inside the dangerous, high-stakes world of illegal gambling to try and understand its allure, its growth and its dark side.

Officers are stumped by a backpacker carrying photos of his criminal activities; an American band gets caught in a jam.

Staff confront an American soldier running scared; a British woman causes confusion with her bag of tricks.

Hidden compartments in a traveler's backpack raise red flags; the discovery of a deadly weapon leaves mail center workers stunned.

Officers look for a message in a bottle; a lack of papers land a group of LA rappers in the doghouse; a young man receives a wake-up call.

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

The source of Slumach's lost gold.

Multiple 911 calls push Dawson City to the brink as they battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

Officers are stumped by a backpacker carrying photos of his criminal activities; an American band gets caught in a jam.

Staff confront an American soldier running scared; a British woman causes confusion with her bag of tricks.

Hidden compartments in a traveler's backpack raise red flags; the discovery of a deadly weapon leaves mail center workers stunned.

Officers look for a message in a bottle; a lack of papers land a group of LA rappers in the doghouse; a young man receives a wake-up call.

As spring begins, the next generation races to finish vital tasks.

The next generation must adapt to the ever-changing demands spring brings.

The team is in the crystal-clear waters of Bimini in the Bahamas to witness the incredible journey of the great hammerhead shark; as the team follows the shark's migration, they discover the secrets of how these animals navigate the vast ocean.

The team travels to the Dominican Republic in the Caribbean to reveal the greatest secrets in the lives of the North Atlantic humpback whale; they witness a mother defend her calf in the ultimate ocean battle with a pack of orcas.

The team is in the Azores to tag the sixgill shark and learn more about its nightly patterns hunting for food in the abyss; the team tags and retrieves valuable data, uncovering why this shark undertakes its epic journey from the depths at night.

In the Azores, the team follows the elusive sperm whales to their hunting grounds a mile beneath the surface, where they discover the secret lives of these deep-diving whales.

Learning how a population of bowhead whales, once hunted almost to extinction, is faring today; the team is the first to observe the feeding strategies of the deep-sea Greenland shark, an animal that can live for more than 400 years.

The team's mission is to figure out if Svalbard's polar bears are adapting to their environment; they face this giant of the Arctic Ocean and scale a glacier to learn how much time is left for one of the most critical habitats for polar bears.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

A lorry hits a safety net and overturns, so Thord and Bjørn have to work into the small hours to rescue the load of fresh salmon; in the north, Jo Roger has to rescue a lorry stuck in the snow.

The team's mission is to figure out if Svalbard's polar bears are adapting to their environment; they face this giant of the Arctic Ocean and scale a glacier to learn how much time is left for one of the most critical habitats for polar bears.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

A lorry hits a safety net and overturns, so Thord and Bjørn have to work into the small hours to rescue the load of fresh salmon; in the north, Jo Roger has to rescue a lorry stuck in the snow.

As spring begins, the next generation races to finish vital tasks.

The next generation must adapt to the ever-changing demands spring brings.

The team is in the crystal-clear waters of Bimini in the Bahamas to witness the incredible journey of the great hammerhead shark; as the team follows the shark's migration, they discover the secrets of how these animals navigate the vast ocean.

The team travels to the Dominican Republic in the Caribbean to reveal the greatest secrets in the lives of the North Atlantic humpback whale; they witness a mother defend her calf in the ultimate ocean battle with a pack of orcas.

An accidental detour leads two Canadians to a dead-end; an ornate frame holds more than just a picture; a man is suspected of money laundering.

An American traveler has trouble recalling his hazy past; bad decisions may keep a rugby player off the pitch; a bag is found in a restricted area.

A traveler's belongings raise repeated alarms; a man's reasons for studying in Canada may not be academic; an American couple make the move to Alaska.

A currency dog sniffs out thousands in undeclared cash; an aspiring actor can't keep track of the plot; officers arrest a wanted burglar.

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.

It's up to Adam to push forward and guide the team through the uncharted terrain of Corbold Canyon.

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.

An accidental detour leads two Canadians to a dead-end; an ornate frame holds more than just a picture; a man is suspected of money laundering.

An American traveler has trouble recalling his hazy past; bad decisions may keep a rugby player off the pitch; a bag is found in a restricted area.

A traveler's belongings raise repeated alarms; a man's reasons for studying in Canada may not be academic; an American couple make the move to Alaska.

A currency dog sniffs out thousands in undeclared cash; an aspiring actor can't keep track of the plot; officers arrest a wanted burglar.

Cesar rehabs an overexcited Australian shepherd and its emotional pet parent.

Cesar helps an aggressive beagle and a Malinois that refuse to leave home.

A pitbulls aggression is fueled by fear; a Frenchie eats everything.

Cesar helps a possessed pit mix and a miniature dachshund with a giant bark.

Cesar rehabilitates a German shepherd whose behavior is getting dangerous.

A couple with a baby seeks Cesar's help with a dog who bites and guards.