With spring coming, Alaskans must prepare for the changing landscape.

Early spring brings change and deadly risks to rural Alaskans.

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 American's trip to Alaska heads south; officers suspect a convicted drug dealer is taking his business north; a ship containing weapons is searched.

Officers stop a father and son packing loads of ammo, but can't find the gun. Meanwhile, the Vessel Search Unit find a suspect sailor on a US tug.

A young man's lies could keep him from his fiancee, while the discovery of a gold bar and lots of cash spell trouble for another traveller.

Suspicions about a convicted smuggler uncover a scam; questions are raised when officers stumble upon a suitcase full of meat.

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

An angry Ken considers firing a worker who disappeared with a crucial piece of equipment; Bernie finally strikes pay dirt; Big Al's camp faces a total shutdown due to equipment problems.

An 84-year-old collector in Balzac, Alberta has a property jam-packed with odd artifacts.

An American's trip to Alaska heads south; officers suspect a convicted drug dealer is taking his business north; a ship containing weapons is searched.

Officers stop a father and son packing loads of ammo, but can't find the gun. Meanwhile, the Vessel Search Unit find a suspect sailor on a US tug.

A young man's lies could keep him from his fiancee, while the discovery of a gold bar and lots of cash spell trouble for another traveller.

Suspicions about a convicted smuggler uncover a scam; questions are raised when officers stumble upon a suitcase full of meat.

Two dogs with bizarre obsessions.

Cesar helps three little dogs with big problems.

In this special episode, Cesar helps two dogs with aggression issues.

In this special episode, Cesar helps two dogs in life-or-death situations.

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.

Phil Breslin tracks down a yellow-bellied glider, an eastern brown snake and a koala.

Phil Breslin journeys down Australia's river system by kayak, all the way from the rocky rapids to the wide brown estuaries; Phil encounters a duc-billed platypus, a long-finned eel and a bull shark.

Lions have killed four buffaloes during a stampede, and in another drying river, a single buffalo fights off five of the big cats. With the approaching dry winter, going on a game drive involves visiting all the remaining waterholes.

Pets in a jam with quills, fishhooks, and string go to PVS to get unstuck.

Phil Breslin tracks down a yellow-bellied glider, an eastern brown snake and a koala.

Phil Breslin journeys down Australia's river system by kayak, all the way from the rocky rapids to the wide brown estuaries; Phil encounters a duc-billed platypus, a long-finned eel and a bull shark.

Lions have killed four buffaloes during a stampede, and in another drying river, a single buffalo fights off five of the big cats. With the approaching dry winter, going on a game drive involves visiting all the remaining waterholes.

Pets in a jam with quills, fishhooks, and string go to PVS to get unstuck.

Two dogs with bizarre obsessions.

Cesar helps three little dogs with big problems.

In this special episode, Cesar helps two dogs with aggression issues.

In this special episode, Cesar helps two dogs in life-or-death situations.

Some engineering students carry out an unusual experiment; officers find a construction worker's story has no foundations.

A jewelry box contains something valuable; a biking teen hits a roadblock; a Thai sailor may be land-locked over computer content; a vagabond musician must prove his worth.

The X-ray machine isn't fooled by aluminum foil wrapping; a truck full of plastic seems like it may have been tampered with.

A British traveler hopes to turn their back on their failed marriage; officers do a close inspection of a car that may contain drugs.

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's wife visits the camp; Guillaume has trouble moving the giant sluice machine; Karl's hopes for a big payday continue to fade as the season reaches the halfway point; Big Al tries to get Big Girl working again.

Picking their way through Ontario, the guys may have hit the jackpot on a sprawling property full of outbuildings.

Some engineering students carry out an unusual experiment; officers find a construction worker's story has no foundations.

A jewelry box contains something valuable; a biking teen hits a roadblock; a Thai sailor may be land-locked over computer content; a vagabond musician must prove his worth.

The X-ray machine isn't fooled by aluminum foil wrapping; a truck full of plastic seems like it may have been tampered with.

A British traveler hopes to turn their back on their failed marriage; officers do a close inspection of a car that may contain drugs.

Archaeologists explore life and death in Ancient Egypt's metropolis, Alexandria.

Archaeologists explore hidden tombs and find spectacular mummies.

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, HSI finds cocaine hidden in frozen avocado pulp.

Sam and Troy embark on a treasure dive while Mary takes a shot at a buck.

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

In this enhanced episode, HSI finds cocaine hidden in frozen avocado pulp.

Sam and Troy embark on a treasure dive while Mary takes a shot at a buck.

Archaeologists explore life and death in Ancient Egypt's metropolis, Alexandria.

Archaeologists explore hidden tombs and find spectacular mummies.

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 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.

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.

A foreign student's possessions are full of surprises; an X-ray machine finds a strange shape inside of a container.

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.

Dr. Oakley faces a toxic emergency and removes the eye of an alpaca.

Dr. Oakley transports a bull by boat and sees chinchillas for a cuteness check.

Dr. Oakley treats a limping bison and a litter of puppies struggling to survive.

Dr. Oakley tries to outsmart a herd of bison and fights for the life of a cherished friend.

Dr. Oakley operates on an unusual mass and investigates a musk ox with a hair loss problem.

Dr. Oakley performs a checkup on two scrappy lynx, and Sierra takes charge on clinic day.

Back in the Yukon, the Oakleys help over 100 cattle and a rowdy mini mule.

Dr. Oakley treats a kitten with a bulging eye, and Sierra preg checks a miniature cow.

Dr. Oakley treats a beagle mix with a severely infected paw and rappels to an eagle's nest.

Dr. Oakley herds a group of unruly reindeer and treats a mini ram with a limp.

Dr. Oakley treats an electrocuted sloth and releases rescued animals back into the wild.

In Costa Rica, Dr. Oakley handles a pair of jaguars and a sloth in heat.

Dr. Oakley competes in a rodeo and treats a dog with persistent nosebleeds.

Dr. Oakley treats an electrocuted sloth and releases rescued animals back into the wild.

In Costa Rica, Dr. Oakley handles a pair of jaguars and a sloth in heat.

Dr. Oakley competes in a rodeo and treats a dog with persistent nosebleeds.

Dr. Oakley faces a toxic emergency and removes the eye of an alpaca.

Dr. Oakley transports a bull by boat and sees chinchillas for a cuteness check.

Dr. Oakley treats a limping bison and a litter of puppies struggling to survive.

Dr. Oakley tries to outsmart a herd of bison and fights for the life of a cherished friend.

Darrell continues to teach Reno how to drive the ice roads; bad wiring could sink Alex's cement load; Lisa and Todd run into a a road block.

The guys are ready to drop big bucks on some treasures in British Columbia.

Darrell continues to teach Reno how to drive the ice roads; bad wiring could sink Alex's cement load; Lisa and Todd run into a a road block.

The guys are ready to drop big bucks on some treasures in British Columbia.

Ken moves across Moose Creek in an effort to change his luck; tension grows as Bernie's junior crew makes mistakes; Karl's night crew slows him down.

Undersea explorers aboard the research vessel Petrel detect a wreck off the coast of the Philippines that fits the profile of an American destroyer.

Hours after emerging victorious in the first carrier-to-carrier battle of World War II, the USS Lexington erupts in flames due to enemy fire; after 80 years, Petrel hopes to spot the wreck and the planes that went down with the ship.

The Petrel team searches for the American aircraft carrier USS Hornet; the ship's life is cut short when the Hornet sails into a hornet's nest of Japanese ships.

What happened aboard the USS Juneau; five brothers are lost, but not all perish when the ship goes down; at least one brother is among scores of men stranded at sea for eight days.

Whistleblower testimony reignites a decades-long fight for transparency.

Commercial pilots come forward about their encounters with UFOs.

Scientists unveil cutting-edge technology helping in the search for UFOs.

People talk about close encounters they've had with UFO phenomena.

Reports from people who say they've been abducted are explored; a Harvard psychiatrist who takes them seriously comes under attack.

No longer waiting for the government to share data, citizen scientists and private groups amplify the search for answers.

Exploring Petra and Hegra reveals Nabatean trade, society, and urban planning.

Gary Mehigan, an Australian chef, travels to Brajbhumi to witness the grand, vibrant and unique celebration of Holi as he engages in a series of activities.

No longer waiting for the government to share data, citizen scientists and private groups amplify the search for answers.

Exploring Petra and Hegra reveals Nabatean trade, society, and urban planning.

Gary Mehigan, an Australian chef, travels to Brajbhumi to witness the grand, vibrant and unique celebration of Holi as he engages in a series of activities.

Undersea explorers aboard the research vessel Petrel detect a wreck off the coast of the Philippines that fits the profile of an American destroyer.

Hours after emerging victorious in the first carrier-to-carrier battle of World War II, the USS Lexington erupts in flames due to enemy fire; after 80 years, Petrel hopes to spot the wreck and the planes that went down with the ship.

The Petrel team searches for the American aircraft carrier USS Hornet; the ship's life is cut short when the Hornet sails into a hornet's nest of Japanese ships.

What happened aboard the USS Juneau; five brothers are lost, but not all perish when the ship goes down; at least one brother is among scores of men stranded at sea for eight days.

A tattoo artist brings the tools of his trade on his vacation; homemade treats conceal a deadly surprise.

A traveler swallows an unknown substance; a Thai vacation guide offers more than holiday advice; a car dealer takes a long road to the truth; hard iced tea and a passenger bring attention to a trucker.

A driver under the influence risks ending the family vacation; a trip behind the wheel of a borrowed truck raises suspicions.

An untruthful traveler is missing two bags; a favor may land an American in hot water; mail center officers uncover a narcotic scheme; a traveler's visa is revealing; a student learns a lesson; a producer's luggage could be showstopper.

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.

Cold weather threatens the miners' operations; Ken contemplates laying off half his crew; Karl's workers hunt moose after their sluice box ices over; Big Al battles beavers.

The source of Slumach's lost gold.

A tattoo artist brings the tools of his trade on his vacation; homemade treats conceal a deadly surprise.

A traveler swallows an unknown substance; a Thai vacation guide offers more than holiday advice; a car dealer takes a long road to the truth; hard iced tea and a passenger bring attention to a trucker.

A driver under the influence risks ending the family vacation; a trip behind the wheel of a borrowed truck raises suspicions.

An untruthful traveler is missing two bags; a favor may land an American in hot water; mail center officers uncover a narcotic scheme; a traveler's visa is revealing; a student learns a lesson; a producer's luggage could be showstopper.

An HSI stakeout leads to nearly $500,000 of meth and fentanyl in San Diego; CBP finds concealed cash and a carload of cocaine at the El Paso border.

PR AMO team hunts down boat loaded with $41 million of coke; CBP gets a tip about money smugglers and finds cocaine and people inside car trunks.

HSI performs an undercover drug sting; CBP finds cocaine in Rio Grande Valley.

CBP's K9 sniffs out hidden cash; HSI intercepts a $2 million drug deal.

CBP in JFK and HSI in San Diego tackle fentanyl crisis on opposite coasts.

HSI partners with Colombian National Police to dismantle illegal gold mining operations; CBP thwarts cartel activity in Texas.

HSI money laundering stings; CBP's largest drug seizure in LAX history.

HSI runs a human trafficking sting; CBP arrests a domestic terror suspect.

CBP seizes suitcases of drugs bound for the UK and looted ancient statues.

Chasing smugglers never has a predictable ending.

HSI runs a human trafficking sting; CBP arrests a domestic terror suspect.

CBP seizes suitcases of drugs bound for the UK and looted ancient statues.

Chasing smugglers never has a predictable ending.

An HSI stakeout leads to nearly $500,000 of meth and fentanyl in San Diego; CBP finds concealed cash and a carload of cocaine at the El Paso border.

PR AMO team hunts down boat loaded with $41 million of coke; CBP gets a tip about money smugglers and finds cocaine and people inside car trunks.

HSI performs an undercover drug sting; CBP finds cocaine in Rio Grande Valley.

CBP's K9 sniffs out hidden cash; HSI intercepts a $2 million drug deal.

A pleasant American jumps the gun when he decides to go on a quick day-trip; a cheerful traveller's trip is in the bag; a baggage search turns cheesy; a traveller's odd luggage needs to go through the proper channels.

Two long boarders can't skate over their border exam; A traveler's phony story is exposed; a sailor's got more than pennies in his pockets; a rocker's lifestyle drums up some crucial questions.

Honesty is the best policy, even for ex-cons; A student gets the dish on declaring items properly.

Airport officers let the khat out of the bag; A repeat offender must prove he's learned his lesson.

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.

The early arrival of winter forces Ken on a dangerous drive for fuel; Karl deals with a frozen sluice plant, a broken vehicle, and other assorted troubles; Bernie loses his pay streak and a crew member.

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

A pleasant American jumps the gun when he decides to go on a quick day-trip; a cheerful traveller's trip is in the bag; a baggage search turns cheesy; a traveller's odd luggage needs to go through the proper channels.

Two long boarders can't skate over their border exam; A traveler's phony story is exposed; a sailor's got more than pennies in his pockets; a rocker's lifestyle drums up some crucial questions.

Honesty is the best policy, even for ex-cons; A student gets the dish on declaring items properly.

Airport officers let the khat out of the bag; A repeat offender must prove he's learned his lesson.

Operating under a noise curfew, Sydney Airport faces pressure to complete 900 plane movements in a day; duty manager George is confronted by a suspicious package.

Baggage manager Kevin has a rough day trouble-shooting a number of mechanical breakdowns; security screening discovers a passenger travelling with a gun.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Torrential rain closes two runways as an incoming flight deals with an onboard medical emergency; a fire training drill turns into a real emergency.

Sydney Airport is on high alert for the arrival of the Prime Minister of Singapore, and Duty Manager Mel's favorite pop star; security searches for a woman reported to have collapsed on the street.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Security breaches, an air ambulance emergency, drugs found in an unattended bag and an angry passenger add up to a busy Friday for Duty Manager George.

Fresh from nine months of training at the Border Force Academy, Labrador Warner faces his first day on the job as a drug sniffer; security managers test their screening teams by trying to smuggle a fake bomb past them.

Lion Air Flight 610 was just 13 minutes into flight from Jakarta, Indonesia, when it plunges into the sea on October 29, 2018.

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

Fresh from nine months of training at the Border Force Academy, Labrador Warner faces his first day on the job as a drug sniffer; security managers test their screening teams by trying to smuggle a fake bomb past them.

Lion Air Flight 610 was just 13 minutes into flight from Jakarta, Indonesia, when it plunges into the sea on October 29, 2018.

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

Operating under a noise curfew, Sydney Airport faces pressure to complete 900 plane movements in a day; duty manager George is confronted by a suspicious package.

Baggage manager Kevin has a rough day trouble-shooting a number of mechanical breakdowns; security screening discovers a passenger travelling with a gun.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Torrential rain closes two runways as an incoming flight deals with an onboard medical emergency; a fire training drill turns into a real emergency.

A traveler has suitcases full of surprises; A Canadian couple returns home with a man-eating beast; two Americans tow their friend's boat to Alaska.

The dogs are brought in to assist officers; A traveler goes gaga at Vancouver International Airport.

Officers question a nervous traveler; a trampoline installer hopes to avoid the bounce around; undeclared dogs from Hungary.

A chef with limited funds and no return ticket; serial numbers aren't piecing together in a gun shipment; a travel agent's last-minute Caribbean booking raises red flags; a boat owner fails to report to CBSA.

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.

Ken uncovers a mother lode of gold after he changes the Beast's location; breakdowns threaten to bring an early end to Bernie's season; Big Al selects a final site for his sluice plant.

According to a 1980s author and historian, the Spanish have a long and hidden history of gold exploration in Pitt Lake, and Slumach found their cache.

A traveler has suitcases full of surprises; A Canadian couple returns home with a man-eating beast; two Americans tow their friend's boat to Alaska.

The dogs are brought in to assist officers; A traveler goes gaga at Vancouver International Airport.

Officers question a nervous traveler; a trampoline installer hopes to avoid the bounce around; undeclared dogs from Hungary.

A chef with limited funds and no return ticket; serial numbers aren't piecing together in a gun shipment; a travel agent's last-minute Caribbean booking raises red flags; a boat owner fails to report to CBSA.

Spring hits remote Alaska and the rush to adapt to change has arrived.

Alaskans must use sweat equity to harvest and preserve their bounty.

Alaskans must harness nature's resources in order to survive in the Arctic.

No matter the season, danger lurks in Alaska's backcountry.

Residents of Alaska must hunt to prepare for the harsh winter months ahead.

With winter approaching, rural Alaskans must prepare for their every need.

As the first signs of winter blanket the landscape, Alaskans must prepare.

The harsh Alaskan winter breeds ingenuity and adaptation 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.

Shocking news of the mass murder-suicide surfaces; dispatched U.S. Special Forces uncover the unimaginable horror, and the search for survivors begins.

The harsh Alaskan winter breeds ingenuity and adaptation 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.

Shocking news of the mass murder-suicide surfaces; dispatched U.S. Special Forces uncover the unimaginable horror, and the search for survivors begins.

Spring hits remote Alaska and the rush to adapt to change has arrived.

Alaskans must use sweat equity to harvest and preserve their bounty.

Alaskans must harness nature's resources in order to survive in the Arctic.

No matter the season, danger lurks in Alaska's backcountry.

Officers get the dope on a traveler's rap sheet; A passenger is unsure of his luggage contents.

Suspicious x-rays; an MMA fighter's story; an RV search that reveals unusual weapons; a cross-border car sale.

A businesswoman's personal items sound alarms; a cargo ship crew member who has been concealing in the ceiling; a puppeteer couple; an American seeking legal advice in Ontario.

Partygoers receive rave reviews at the Coutts crossing; officers delve into an international affair.

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.

Snow threatens to bury Ken's pay dirt; Karl ignores his father's advice; Big Al deals with failing equipment and unhappy workers as his first season comes to an end.

Adam, Kru and Tony follow the path of a failed 1982 Vancouver news team led by a Slumach gold hunter and mystic dowser.

Officers get the dope on a traveler's rap sheet; A passenger is unsure of his luggage contents.

Suspicious x-rays; an MMA fighter's story; an RV search that reveals unusual weapons; a cross-border car sale.

A businesswoman's personal items sound alarms; a cargo ship crew member who has been concealing in the ceiling; a puppeteer couple; an American seeking legal advice in Ontario.

Partygoers receive rave reviews at the Coutts crossing; officers delve into an international affair.

There's no time to rest with emergency calvings, rowdy pups, and ailing felines.

A new Pol family member is born.

A blocked bearded dragon; a feisty cow to dodge; a surprise for Tater.

A puppy tornado touches down at PVS; a cute kitten is rescued.

A snake with lumps, a cat with a sky-high temperature, and a goose on the loose.

Dr. Pol has the great honor of escorting U.S. veterans to Washington.

Dr. Pol and Diane celebrate a milestone that's been decades in the making.

Dr. Pol celebrates turning 80 with a trip to the Netherlands with Diane.

Leopards, lions, crocs and hippos battle it out around dwindling waterholes.

The Pols welcome a fluffy addition to the family; Tater is not pleased.

Dr. Pol celebrates turning 80 with a trip to the Netherlands with Diane.

Leopards, lions, crocs and hippos battle it out around dwindling waterholes.

The Pols welcome a fluffy addition to the family; Tater is not pleased.

There's no time to rest with emergency calvings, rowdy pups, and ailing felines.

A new Pol family member is born.

A blocked bearded dragon; a feisty cow to dodge; a surprise for Tater.

A puppy tornado touches down at PVS; a cute kitten is rescued.

Cookies can be more trouble than treat; twins with matching beers take a wrong turn.

Officers make a stunning discovery; a tourist's papers hint at her true plans for coming to Canada.

A senior has some unfriendly gear in his RV; a Canadian returning from Panama tells all.

An American is busted trying to catch a different kind of trip; officers help a tipsy traveler.

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

Karl hopes to score 100 ounces of gold in one week; Ken must deal with an eager employee who keeps breaking equipment.

After aborting his mission last season, lone wolf prospector David Muise returns undeterred and looking for a partner.

Cookies can be more trouble than treat; twins with matching beers take a wrong turn.

Officers make a stunning discovery; a tourist's papers hint at her true plans for coming to Canada.

A senior has some unfriendly gear in his RV; a Canadian returning from Panama tells all.

An American is busted trying to catch a different kind of trip; officers help a tipsy traveler.

Francis Drake is cemented in history as the world's most controversial pirate.

Grace O'Malley defies gender conventions of her day and becomes the most feared and respected leader of both the land and the sea, eventually rising to Chieftain.

Englishman-turned-Algerian pirate John Ward becomes ruler of the Tunisian empire.

Brilliant strategist Morgan takes humans, treasure, and towns without mercy.

Captain Kidd, the treasure hunter, turns from pirate hunter to pirate.

Blackbeard's name strikes fear into all as a brutal diabolical pirate.

Braver than the men, Anne Bonny and Mary Read are ferocious female pirates.

Bartholomew Roberts is the most successful pirate of the Golden Age.

CBP officers in McAllen shut down the port over a potential bomb threat; HSI San Diego conducts a sting operation to arrest fentanyl traffickers.

Curly fires the first rounds of duck season; Oliver hunts for fresh crab.

Bartholomew Roberts is the most successful pirate of the Golden Age.

CBP officers in McAllen shut down the port over a potential bomb threat; HSI San Diego conducts a sting operation to arrest fentanyl traffickers.

Curly fires the first rounds of duck season; Oliver hunts for fresh crab.

Francis Drake is cemented in history as the world's most controversial pirate.

Grace O'Malley defies gender conventions of her day and becomes the most feared and respected leader of both the land and the sea, eventually rising to Chieftain.

Englishman-turned-Algerian pirate John Ward becomes ruler of the Tunisian empire.

Brilliant strategist Morgan takes humans, treasure, and towns without mercy.

Polar drivers Lisa, Art and Todd start on an epic journey up the longest seasonal winter road in the world; VP stays closer to home, traveling dangerous roads in a late attempt to boost their load count.

Lisa has to decide help a competitor push further into the arctic unknown or go back to Polar headquarters with her teammates.

A heavy automobile container hints at trouble; A student's stash of food brings him discomfort.

Lisa has to decide help a competitor push further into the arctic unknown or go back to Polar headquarters with her teammates.

Welcome to the fair; Vets rally to keep dreams alive for hardworking kids.

Charles is worried about his dog Athena and looks to his dad for guidance.

From the North Pole to Dr. Pol, everyone is getting in the Christmas spirit.

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.