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.

A Canadian is interviewed after officers find pictures of pot plants on his phone; a canine team detects marijuana on a couple.

A conductor arrives to lead a symphony orchestra; a drug dealer tries to enter the United States.

CBP worries a man from Nicaragua may not leave the U.S.; a traveler's plan to start an e-vape business may go up in smoke.

An American returning from the Dominican Republic brings an unusual item; an unknown substance is tested.

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.

Now in a wheelchair, Big Al returns to gold mining; Bernie clashes with his son; Karl finds gold right away; Chris reunites with his partner and their kids.

Stories from London's National Maritime Museum include the shooting of Adm. Horatio Nelson, the capture of pirates, Capt. Bligh's commandeering of a lifeboat, and lightning strikes at sea.

A Canadian is interviewed after officers find pictures of pot plants on his phone; a canine team detects marijuana on a couple.

A conductor arrives to lead a symphony orchestra; a drug dealer tries to enter the United States.

CBP worries a man from Nicaragua may not leave the U.S.; a traveler's plan to start an e-vape business may go up in smoke.

An American returning from the Dominican Republic brings an unusual item; an unknown substance is tested.

Gordon explores the wilds of Wales to discover the rustic ingredients.

Gordon Ramsay and his daughter Tilly face off in a Costa Rican culinary showdown.

Gordon embraces local ingenuity as he fishes and forages through Cuba.

Gordon battles it out at Petra to impress Jordan's royal family.

Gordon dives into the culinary ocean of the Florida Keys.

Gordon dives, hunts, forages and forges on Hawaii's Big Island.

Gordon and his daughter Tilly explore centuries-old culinary traditions in Galicia, a largely overlooked but magnificent corner of Spain.

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

Dr. Oakley treats a limping bull bison and a dog with a mammary mass.

A young zebra undergoes urgent abdominal surgery after an encounter with an eland's horn; two meerkats jostle for top position in the meerkat mob.

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

Dr. Oakley treats a limping bull bison and a dog with a mammary mass.

A young zebra undergoes urgent abdominal surgery after an encounter with an eland's horn; two meerkats jostle for top position in the meerkat mob.

Gordon explores the wilds of Wales to discover the rustic ingredients.

Gordon Ramsay and his daughter Tilly face off in a Costa Rican culinary showdown.

Gordon embraces local ingenuity as he fishes and forages through Cuba.

Gordon battles it out at Petra to impress Jordan's royal family.

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.

An Indian rhino is prepared for breeding; tree kangaroos; Spinnaker the dolphin.

The men and women who live side by side with the animals at the Toronto Zoo.

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.

An Indian rhino is prepared for breeding; tree kangaroos; Spinnaker the dolphin.

The men and women who live side by side with the animals at the Toronto Zoo.

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

A Border Collie causes isolation and a Chihuahua bites the hand that feeds her.

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Cesar helps sequestered sisters and a woman preparing for surgery.

A Boston terrier fights with an Akita next door; two terriers hunt dogs.

Cesar rehabilitates a dominant chocolate Labrador and an overexcited golden retriever.

Cesar helps a dog that was confined for a decade and another that pees too much.

Cesar rehabilitates a terrified Chihuahua for two professional dancers.

Cesar must teach a young pet-parent that rough play is no substitute for long walks.

Cesar works with a couple whose fear is causing their dog to bite; young husky that doubles as an escape artist.

Cesar rehabs Hendrix, a self-made guard dog that bites and mounts at home.

The vets tackle a twisted calving, a flock of ducks and a pack of rats.

Cesar gives direction to two families who are struggling to move forward.

Cesar rehabs Hendrix, a self-made guard dog that bites and mounts at home.

The vets tackle a twisted calving, a flock of ducks and a pack of rats.

Cesar gives direction to two families who are struggling to move forward.

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

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

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Cesar helps sequestered sisters and a woman preparing for surgery.

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

A pair of Siberian tigers are introduced to each other; an anteater is moved; Patsy the elephant needs a blood test.

The gorilla's old exhibit is torn down; the keepers hope the tigers will mate.

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

A pair of Siberian tigers are introduced to each other; an anteater is moved; Patsy the elephant needs a blood test.

The gorilla's old exhibit is torn down; the keepers hope the tigers will mate.

A keeper learns to handle birds of prey; Patsy still isn't behaving; Charles the silverback gorilla.

Charles the gorilla has surgery, while Tahra learns how to catch and weigh the Tasmanian devils.

Mariana explores surrogacy's dark side; 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 investigates the dangerous, high-stakes world of illegal gambling.

Mariana heads to the Congo to investigate the illegal trading of wild apes that have 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.

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.

Tim Shaw and Fuzz Townshend undertake dramatic automobile interventions across the U.K.

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

Unearthed dinosaur bones and shipwrecks reveal secrets of world history.

Tim Shaw and Fuzz Townshend undertake dramatic automobile interventions across the U.K.

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

Unearthed dinosaur bones and shipwrecks reveal secrets of world history.

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 investigates the dangerous, high-stakes world of illegal gambling.

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

Officers find cocaine inside a Caribbean cocktail; officers sift through packages of pills.

Real estate entrepreneurs are questioned; a traveler's investments in the U.S. raises alarms; suspicious Mexican souvenirs.

A traveler is caught driving without a license; a U.S. resident returns from the Dominican Republic.

Human bones are found inside luggage; a pair fails to declare thousands of dollars in jewelry; a mysterious powder is masked by beauty products.

Festive gladiators, whispering camel herders and the water demands of ancient Romans are among the stories found in the National Bardo Museum in Tunis, Tunisia.

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.

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

Officers find cocaine inside a Caribbean cocktail; officers sift through packages of pills.

Real estate entrepreneurs are questioned; a traveler's investments in the U.S. raises alarms; suspicious Mexican souvenirs.

A traveler is caught driving without a license; a U.S. resident returns from the Dominican Republic.

Human bones are found inside luggage; a pair fails to declare thousands of dollars in jewelry; a mysterious powder is masked by beauty products.

CBP hunts for drugs in a jungle and finds meth in a car bumper.

Officers confront human smuggling at the border and nab a car loaded with fentanyl.

HSI nabs car loaded with a medley of narcotics; CBP seizes looted ancient artifacts.

CBP screens for club drugs hidden in toiletries, while HSI uncovers meth buried in garlic.

HSI busts an illegal gun operation in NYC, while CBP confronts a meth surge from Mexico.

HSI snags a truck loaded with meth.

HSI finds cocaine-filled tire rims in cargo and nabs a car loaded with meth and fentanyl.

HSI seizes counterfeit cash and vax cards; CBP pulls 205 kilos of meth out of one car.

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

When hippies developed a steady hash trade, Ibiza's reputation as a haven for drugs soon reached organised crime groups, who quickly seized the market on the Mediterranean island.

HSI seizes counterfeit cash and vax cards; CBP pulls 205 kilos of meth out of one car.

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

When hippies developed a steady hash trade, Ibiza's reputation as a haven for drugs soon reached organised crime groups, who quickly seized the market on the Mediterranean island.

CBP hunts for drugs in a jungle and finds meth in a car bumper.

Officers confront human smuggling at the border and nab a car loaded with fentanyl.

HSI nabs car loaded with a medley of narcotics; CBP seizes looted ancient artifacts.

CBP screens for club drugs hidden in toiletries, while HSI uncovers meth buried in garlic.

A traveler is caught with injections; officers smoke out marijuana residue; a mom may end up in jail due to a wrong turn.

A one-way ticket raises red flags; a traveler is caught with undeclared meat; officers find a loaded gun and live crab.

Officers find white powder in tea sacks; pills marked ICE are frozen; some furry foreigners arrive to spread good will.

A traveler is caught with cocaine-filled pen caps; a long stay alerts CBP; a probation-breaking welder feels the heat.

Find out how an Egyptian baby died 2000 years ago, as this tiny mummy is unwrapped.

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

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.

A traveler is caught with injections; officers smoke out marijuana residue; a mom may end up in jail due to a wrong turn.

A one-way ticket raises red flags; a traveler is caught with undeclared meat; officers find a loaded gun and live crab.

Officers find white powder in tea sacks; pills marked ICE are frozen; some furry foreigners arrive to spread good will.

A traveler is caught with cocaine-filled pen caps; a long stay alerts CBP; a probation-breaking welder feels the heat.

Mariana explores surrogacy's dark side; 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 investigates the dangerous, high-stakes world of illegal gambling.

Mariana heads to the Congo to investigate the illegal trading of wild apes that have 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.

Three real-world disasters dissected; in space, in a hotel, on a bridge.

Taking a look at the excavations in the La Brea Tar Pits in Los Angeles and showcasing how the pits can help unravel the mystery of how the saber-toothed tiger hunted its prey.

Mariana goes inside the world of contract killers.

Three real-world disasters dissected; in space, in a hotel, on a bridge.

Taking a look at the excavations in the La Brea Tar Pits in Los Angeles and showcasing how the pits can help unravel the mystery of how the saber-toothed tiger hunted its prey.

Mariana explores surrogacy's dark side; 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 investigates the dangerous, high-stakes world of illegal gambling.

A fake ID is comes to light at the border; a young traveler's stories don't jibe; CBP hounds sniff out forbidden food.

Officers find a stash of luxury knockoffs; a drag race fan slows his roll; CBP catches a wanted duo.

A car's radiation levels alert CBP; an officer digs up a stash of deadly bath salts; multiple phones materialize.

CBP converges on flights arriving from drug-source countries; a coffee expo volunteer finds trouble; pills are found in film containers.

Prehistoric Britains; killer shark; famous gem that kills; WWII spies; Barbary Lions; a Dodo bird.

Massive and sophisticated contributions from Korea have shaped our modern world, from ancient advances like the greenhouse and armoured boats to modern screen technology, online gaming, E-sports and K-Pop.

Nika and Chris face breakdowns and water problems; Ken's wife wants him home for their child's birth; Bernie's son goes AWOL.

A fake ID is comes to light at the border; a young traveler's stories don't jibe; CBP hounds sniff out forbidden food.

Officers find a stash of luxury knockoffs; a drag race fan slows his roll; CBP catches a wanted duo.

A car's radiation levels alert CBP; an officer digs up a stash of deadly bath salts; multiple phones materialize.

CBP converges on flights arriving from drug-source countries; a coffee expo volunteer finds trouble; pills are found in film containers.

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.

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

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

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

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

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

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.

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.

A faceoff develops over luxury counterfeits; agents detect potentially lethal powder; a CBP beagle finds the mother load of meat.

Suspected of smuggling narcotics, a jittery traveler's next stop is a medical facility; a pair arrives bearing a trophy; CBP question a DJ's find.

A tourist's uncertain vacation plans make him suspicious; two backpackers return with more than just memories; in Port Huron, a traveler carries a concealed weapon.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

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

Mexico's gifts to the world include the tomato, the avocado, tacos, tequila, Frida Kahlo, Oscar-winning directors, Mexican wrestling, Latino pop music, silver, rubber, and Mayan astronomy.

Big Al's gamble pays off; Bernie argues with his son Justin; Ken and Guillaume sluice before Ken has to leave for his child's birth; Karl's team tries to sluice 200 ounces of gold in a week.

A faceoff develops over luxury counterfeits; agents detect potentially lethal powder; a CBP beagle finds the mother load of meat.

Suspected of smuggling narcotics, a jittery traveler's next stop is a medical facility; a pair arrives bearing a trophy; CBP question a DJ's find.

A tourist's uncertain vacation plans make him suspicious; two backpackers return with more than just memories; in Port Huron, a traveler carries a concealed weapon.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Dr. Oakley treats a rescued pig and a dog with a porcupine vendetta.

Dr. Oakley treats an off-the-grid dachshund and an emotional support pig.

Dr. Oakley escorts a horse on a boat and treats a bull with a limp.

Dr. Oakley treats a horse with a limp and an overweight dog.

Dr. Oakley treats a dog with a bloated stomach and a cow with a lumpy jaw.

Dr. Oakley treats a chunky chicken and a calf that was attacked by a bear.

Dr. Oakley preg checks rabbits, helps a sore duck, and relieves a reindeer.

Dr. Pol and his wife opened a veterinary service out of their home in 1981 and have helped more than 19,000 clients alongside the talented Dr. Grettenberger.

An over-policing pit mix and a space-invading schnauzer.

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

Dr. Pol and his wife opened a veterinary service out of their home in 1981 and have helped more than 19,000 clients alongside the talented Dr. Grettenberger.

An over-policing pit mix and a space-invading schnauzer.

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

Dr. Oakley treats a rescued pig and a dog with a porcupine vendetta.

Dr. Oakley treats an off-the-grid dachshund and an emotional support pig.

Dr. Oakley escorts a horse on a boat and treats a bull with a limp.

Dr. Oakley treats a horse with a limp and an overweight dog.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Discover the secrets behind the scenes at the Vatican Museum.

From early exploration to cutting-edge technologies, Sweden has helped define the modern world through innovations from Viking ship design, IT, dynamite, Nobel prizes, and the music of ABBA.

Nika and Chris face a repair they can't afford; Guillaume has trouble while Ken is gone; Karl asks his family for help; Bernie gets a surprise.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Cameras follow U.S. border protection agencies as they man the front lines of national security.

Archaeologists investigate how the river Nile transformed ancient Egypt.

Archaeologists investigate Egypt's famous warrior king, Alexander the Great.

Hunting Egypt's lost treasures in the Valley of the Kings.

In the shadow of the Great Pyramid, archaeologists unearth a royal palace.

Archeologists excavate an unexplored burial chamber inside a pyramid.

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

Archaeologists explore hidden tombs and find spectacular mummies.