A cheetah steals a camera; a dog honks a horn; a rat plays a harmonica.

A dog gets a hole in one, a turtle and a gator high five, and a roadrunner dances.

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

Archaeologists investigate Egypt's last legendary Queen, Cleopatra.

Archaeologists investigate the mysterious mega tombs of a forgotten era.

Experts investigate a forgotten valley hiding a hoard of royal mummies.

On her first solo trip, Steph Custance braves one of the longest ice crossings on the map; Darrell Ward attempts a triple delivery in a single day; an engine fire stops Lisa Kelly in her tracks; Todd Dewey celebrates his birthday stuck on a road.

A Siberian tiger gives birth prematurely; a blind bird goes for a stroll; a cheetah gets an exam.

The keepers have a half hour to move three cheetahs; Patsy finally obeys; Chao Nao the red panda.

On her first solo trip, Steph Custance braves one of the longest ice crossings on the map; Darrell Ward attempts a triple delivery in a single day; an engine fire stops Lisa Kelly in her tracks; Todd Dewey celebrates his birthday stuck on a road.

A Siberian tiger gives birth prematurely; a blind bird goes for a stroll; a cheetah gets an exam.

The keepers have a half hour to move three cheetahs; Patsy finally obeys; Chao Nao the red panda.

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 a sheep with a large growth and the eye of a tiny owl.

Dr. Oakley treats a pair of neglected dogs, and Willow rescues feral cats.

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

Dr. Oakley treats a sheep with a large growth and the eye of a tiny owl.

Dr. Oakley treats a pair of neglected dogs, and Willow rescues feral cats.

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.

Todd Dewey must fix his truck or find himself stranded a hundred miles from the nearest town; Alex Debogorski confronts a creek in the middle of the road; Art Burke receives bad news; Lisa Kelly battles an ice crossing unlike any she's seen.

Wood bison are moved to the Calgary Zoo; the gorillas try out their new home; two polar bear cubs.

A female polar bear has a hysterectomy; a new lion exhibit; a red panda is trained.

Todd Dewey must fix his truck or find himself stranded a hundred miles from the nearest town; Alex Debogorski confronts a creek in the middle of the road; Art Burke receives bad news; Lisa Kelly battles an ice crossing unlike any she's seen.

Wood bison are moved to the Calgary Zoo; the gorillas try out their new home; two polar bear cubs.

A female polar bear has a hysterectomy; a new lion exhibit; a red panda is trained.

Devan prepares for fire season in the DC-4 tanker; Joe and Mikey travel to England to witness the end of an era in aviation.

Ben Horton travels to the Ningxia Autonomous Hui Region, located in northern China.

Photographer Ben Horton teams up with Chinese explorers for an intrepid journey to three remote locations in search of communities that are thriving in extreme environments.

Two Chinese adventurers embark on a dangerous journey exploring one of China's biggest underwater cave systems, Du'an, to discover its hidden secrets.

The remodeling of Real Madrids stadium defies the limits of engineering.

The most-famous witch trials of them all: Salem, Massachusetts.

The brutal Trier witch trials and the origins of witch-hunting.

The true story of the first major witch trials in Scotland.

Witch-hunters torture so-called witches during England's Civil War.

Swedish children tell stories of a place witches took them to.

A terrifying tale of demonic possession in a witch trial in Ireland.

Antoni takes Henry to Borneo, where they unearth family stories and taste their way to a deeper connection with Henry's mother's Iban heritage; Henry learns that genealogy in this oral tradition is about far more than storytelling.

Cutting-edge scan creates a digital twin of Titanic for immersive, 3D investigation.

Wildlife activists Benhail Antao and Louise Remedios team up to catch an elusive cobra in a temple while they try to calm an agitated caller.

Antoni takes Henry to Borneo, where they unearth family stories and taste their way to a deeper connection with Henry's mother's Iban heritage; Henry learns that genealogy in this oral tradition is about far more than storytelling.

A terrifying tale of demonic possession in a witch trial in Ireland.

Photographer Ben Horton teams up with Chinese explorers for an intrepid journey to three remote locations in search of communities that are thriving in extreme environments.

Two Chinese adventurers embark on a dangerous journey exploring one of China's biggest underwater cave systems, Du'an, to discover its hidden secrets.

The remodeling of Real Madrids stadium defies the limits of engineering.

The most-famous witch trials of them all: Salem, Massachusetts.

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

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 chase of the thief who stole the Mona Lisa and how it was recovered.

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

Joe takes to the air with the Snowbirds; the company is shaken by a sudden departure; Mikey begins flying lessons.

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

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.

CBP uncovers smuggled human remains; Border Patrol stops migrant smugglers.

CBP Dulles finds outbound drugs; Border Patrol tracks human smugglers.

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.

Rookie CBP officers find multiple drugs; HSI runs a buy-bust operation.

Border Patrol chases suspect fleeing arrest; CBP stops weed leaving the U.S.

Curly shoots a bear; Troy and Sarah struggle with a new water system.

A big bomb explodes outside a federal building in Oklahoma City.

Border Patrol chases suspect fleeing arrest; CBP stops weed leaving the U.S.

Curly shoots a bear; Troy and Sarah struggle with a new water system.

A big bomb explodes outside a federal building in Oklahoma City.

CBP uncovers smuggled human remains; Border Patrol stops migrant smugglers.

CBP Dulles finds outbound drugs; Border Patrol tracks human smugglers.

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

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

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.

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.

Discover the secrets behind the scenes at the Vatican Museum.

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.

Highlights from five years of the series, including behind-the-scenes footage and recollections from the Buffalo crew.

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.

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.

Mariana follows a famous cocaine smuggling route in this enhanced episode.

Mariana uncovers American guns smuggled to Mexico.

Enhanced; Mariana tracks a new wave of underground steroids.

Mariana investigates the illicit trade in human organs.

Mariana goes in search of the elusive chemists who make the world's LSD.

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

Mariana investigates the lucrative black market for private data.

Enhanced: Mariana follows the booming MDMA supply chain.

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

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

Enhanced: Mariana follows the booming MDMA supply chain.

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

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

Mariana follows a famous cocaine smuggling route in this enhanced episode.

Mariana uncovers American guns smuggled to Mexico.

Enhanced; Mariana tracks a new wave of underground steroids.

Mariana investigates the illicit trade in human organs.

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

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.

Searching for Ramesses' tomb; re-creating the last moments of an ancient king's life.

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.

Buffalo struggles to make its Christmas deliveries; Prefkar Mony copes with life in the North.

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

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.

Alaska Natives prepare for fall hunting and harvest.

Alaska Natives stockpile food and resources ahead of winter.

The youngest generation of Alaska Natives look to become providers.

Indigenous Alaskans live on ancient lands but face a new climate of challenges.

In a modern world, Alaska Natives live off the land as their people have for centuries.

Alaska Natives harvest food by land and sea to provide for their families.

On the lands of their ancestors, Alaska Natives build new futures using old ways.

Unstable winter weather tests the Indigenous Alaskan way of life.

In the Arctic Circle, David battles extreme cold in search of magic.

Dr. Oakley lassos a calf, shears an overgrown sheep and treats a dog with an eye injury.

Unstable winter weather tests the Indigenous Alaskan way of life.

In the Arctic Circle, David battles extreme cold in search of magic.

Dr. Oakley lassos a calf, shears an overgrown sheep and treats a dog with an eye injury.

Alaska Natives prepare for fall hunting and harvest.

Alaska Natives stockpile food and resources ahead of winter.

The youngest generation of Alaska Natives look to become providers.

Indigenous Alaskans live on ancient lands but face a new climate of challenges.

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

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

A traveler returns with a surprise; Marine officers come upon an infested container.

A student is failing his customs exam; officers prevent an artifact from going down in history.

One of the world's largest collections of art features galleries filled with tragedy, madness and murder.

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

Buffalo's Electra aircraft gets hit with high winds; a rookie crew faces a terrible ice storm.

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

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

A traveler returns with a surprise; Marine officers come upon an infested container.

A student is failing his customs exam; officers prevent an artifact from going down in history.

When a sick dog can barely walk, the PVS vets are on the case.

PVS is busy with a sick Shih Tzu, boisterous camels, and a hungry iguana.

From a harrowing farrowing to broken bones, the PVS vets pull off miracles.

Donkeys, ducks and dogs, from quirky to jaw dropping.

PVS helps a laboring Lab, a big, wounded pig, and a kitten needing a home.

Santa takes a leap and Doc goes flying.

The vets swing into action mending paws, jaws, and a down on his luck duck.

Dr. Nicole tends to her old, beloved beagle, and it's all hands on deck for a litter of 11 puppies.

Dr. Oakley treats an emaciated chicken and a dog with a lacerated paw.

Clinic house cat, Tater, falls ill and the team bands together to save him.

Dr. Nicole tends to her old, beloved beagle, and it's all hands on deck for a litter of 11 puppies.

Dr. Oakley treats an emaciated chicken and a dog with a lacerated paw.

Clinic house cat, Tater, falls ill and the team bands together to save him.

When a sick dog can barely walk, the PVS vets are on the case.

PVS is busy with a sick Shih Tzu, boisterous camels, and a hungry iguana.

From a harrowing farrowing to broken bones, the PVS vets pull off miracles.

Donkeys, ducks and dogs, from quirky to jaw dropping.

The canine unit brings home the bacon; A traveler discovers she's got a friend in high places.

Joining dedicated teams of agents at Canada's airports and seaports as they intercept visitors smuggling illegal contraband and tourists with tall stories.

A captain navigates troubled waters when he forgets to declare himself to the authorities.

An American arrives at customs with firearms; a traveler makes a breathtaking statement.

African wildlife; horseshoe crab blood; a dinosaur embryo; knots in string; a comet's tail.

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

Engine trouble plagues Buffalo's newest plane; a standoff between Joe and Transport Canada threatens to close the airline; Joe faces a tough decision about his old dog Sophie.

The canine unit brings home the bacon; A traveler discovers she's got a friend in high places.

Joining dedicated teams of agents at Canada's airports and seaports as they intercept visitors smuggling illegal contraband and tourists with tall stories.

A captain navigates troubled waters when he forgets to declare himself to the authorities.

An American arrives at customs with firearms; a traveler makes a breathtaking statement.

While the arrival of the Spaniards in the 16th century triggered a series of wars that caused the abandonment of the great Mayan cities, there is evidence that the Mayans never disappeared and their civilization never fell.

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

Archaeologists dig in Pompeii to uncover its dark secrets.

Archaeologists reveal the stunning new 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.

A beaver smells something strange, chickens run on wet concrete, and a dog steals a pacifier.

A monkey steals food, a lizard surprises a lady and a bear breaks a gate.

A spider hides in a shoe, a squirrel scores a touchdown, and a terrier is offended by a balloon.

A beaver smells something strange, chickens run on wet concrete, and a dog steals a pacifier.

A monkey steals food, a lizard surprises a lady and a bear breaks a gate.

A spider hides in a shoe, a squirrel scores a touchdown, and a terrier is offended by a balloon.

While the arrival of the Spaniards in the 16th century triggered a series of wars that caused the abandonment of the great Mayan cities, there is evidence that the Mayans never disappeared and their civilization never fell.

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

Archaeologists dig in Pompeii to uncover its dark secrets.

Archaeologists reveal the stunning new discovery of a Nero megastructure.

As the end of the season nears, Mark Kohaykewych makes a deal with rivals Darrell Ward and Lisa Kelly to join forces for a four-truck convoy; Alex Debogorski must complete one of the longest trails; Art Burke's truck gives out on the ice.

A female snow leopard arrives from Calgary; the crocodiles and meerkats get new homes.

Rain-forest exhibit; monkey and trainer bond; young camel begins training.

As the end of the season nears, Mark Kohaykewych makes a deal with rivals Darrell Ward and Lisa Kelly to join forces for a four-truck convoy; Alex Debogorski must complete one of the longest trails; Art Burke's truck gives out on the ice.

A female snow leopard arrives from Calgary; the crocodiles and meerkats get new homes.

Rain-forest exhibit; monkey and trainer bond; young camel begins training.

The docs at Critter Fixer embark on their new "Vet for a Day" national tour.

With extra scenes; the docs work to keep the clinic clean while meeting an adventurous cockatiel, an eager beaver and a cow that takes them surfing.

The docs at Critter Fixer operate on an eel and perform a snake C-section.

The Docs are awarded keys to the city for years of community service; helping a red tail boa; introducing a kid to a kid.

The docs at Critter Fixer help 15 celebrity chihuahuas and a baby duckling.

To avenge 9/11, DEA agent Jeff Higgins pursues Afghan kingpin Haji Bagcho.

Enhanced episode; how a party bro became the biggest pill mill boss in the U.S.

Enhanced episode; chemists, gangs and cartels bring in fentanyl.

Students begin an intense journey to ISEF; before they can advance to the international science stage, they have to compete in local fairs.

Qualifying science fair season begins for students in Monte Vista, CO and San Juan, PR who hope this will be their year to make it to ISEF.

ISEF, the International Science and Engineering Fair; finding out who out of 2,000 students make it.

The Docs at Critter Fixer strive to aid the animals of service members.

The docs at Critter Fixer exemplify treating both ends of the leash.

ISEF, the International Science and Engineering Fair; finding out who out of 2,000 students make it.

The Docs at Critter Fixer strive to aid the animals of service members.

The docs at Critter Fixer exemplify treating both ends of the leash.

The docs at Critter Fixer embark on their new "Vet for a Day" national tour.

With extra scenes; the docs work to keep the clinic clean while meeting an adventurous cockatiel, an eager beaver and a cow that takes them surfing.

The docs at Critter Fixer operate on an eel and perform a snake C-section.

The Docs are awarded keys to the city for years of community service; helping a red tail boa; introducing a kid to a kid.

The truckers in the historic four-truck convoy face fire and a thin crossing; after Art Burke's engine dies, he must travel back to Winnipeg with Alex Debogorski over a trail that destroys his truck.

A monkey is reintroduced to his family; baby fruit-bat; tree kangaroo.

Andrea checks the black footed ferret for babies; Chao Nao; Tahra trains with Merlin the falcon.

The truckers in the historic four-truck convoy face fire and a thin crossing; after Art Burke's engine dies, he must travel back to Winnipeg with Alex Debogorski over a trail that destroys his truck.

A monkey is reintroduced to his family; baby fruit-bat; tree kangaroo.

Andrea checks the black footed ferret for babies; Chao Nao; Tahra trains with Merlin the falcon.

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

Descendants of survivors of the last American slave ship visit the land of their ancestors.

Drug lord Khun Sa floods New York, N.Y., with purity heroin until the DEA hatches a plan.

In this enhanced episode, an army veteran helps flood Harlem with heroin.

The mob connects with the Mujahideen to create an ambitious heroin pipeline.

The Bible describes Nineveh as a wicked city of sin; finding if new discoveries in Iraq and Israel can shed light on the events behind this fearsome reputation.

New discoveries unlock the origins of the Bible's flood story.

Archaeologists discover evidence that sheds fresh light on historical influences from Egypt for the biblical tale of the Exodus.

Archaeologists discover new evidence in Iraq that sheds light on the historical influences of the Bible's Tower of Babel story.

Archaeologists make groundbreaking discoveries about the world of Solomon.

Many persons revile King Herod as one of the evil characters in the Bible; later historians coin him Herod "the Great.".

In Antarctica, emperor penguin societies reveal the bonds they forge from birth, which are the key to survival in their habitat.

A colorful collection of daredevils inspires David to take a leap of faith.

Many persons revile King Herod as one of the evil characters in the Bible; later historians coin him Herod "the Great.".

In Antarctica, emperor penguin societies reveal the bonds they forge from birth, which are the key to survival in their habitat.

A colorful collection of daredevils inspires David to take a leap of faith.

Drug lord Khun Sa floods New York, N.Y., with purity heroin until the DEA hatches a plan.

In this enhanced episode, an army veteran helps flood Harlem with heroin.

The mob connects with the Mujahideen to create an ambitious heroin pipeline.

The Bible describes Nineveh as a wicked city of sin; finding if new discoveries in Iraq and Israel can shed light on the events behind this fearsome reputation.

An irritated traveler pushes officers to the limit; Haitian fruits may contain more than vitamins.

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 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.

Joe goes for medical testing in Arizona; Jeff and Sam stress over their checkflights; Joe celebrates turning 17.

British Prime Minister Winston Churchill risks his life during the Blitz; Nazis torture a housewife-spy; Saddam Hussein faces defeat; modern-day soldiers become invisible.

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.

An irritated traveler pushes officers to the limit; Haitian fruits may contain more than vitamins.

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 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.

HSI finds overcrowded human stash houses; CBP discovers meth in machinery.

HSI Miami catches a load of cocaine-filled fish; CBP San Diego fights human smuggling.

HSI busts a ketamine smuggler, while CBP uncovers ancient gold looted from Afghanistan.

AMO Puerto Rico sinks a marine smuggling op; HSI San Diego seals up a drug tunnel.

HSI busts a notorious dark web trafficker in France, while CPB finds fentanyl in Arizona.

AMO agents in Puerto Rico chase a fleeing boat carrying $2.5 million worth of cocaine.

CBP discovers abandoned fentanyl in Texas; HSI tracks an ecstasy package in Chicago.