Alaskans enter a new dawn in the Arctic winter.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

The drama now centers around the river where enchanting new characters, including an adorable baby hippo, meet old favorites; bonds of kinship are tested as adventures continue.

Alaskans enter a new dawn in the Arctic winter.

A look at Isaac Newton;a visit to CERN.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In 1989, a ferocious explosion on the sun's surface released a cloud of highly charged particles containing the energy of 20 million nuclear bombs, and this solar superstorm then hit Earth; in Quebec, Canada, the lights suddenly went out.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

A look at Isaac Newton;a visit to CERN.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In 1989, a ferocious explosion on the sun's surface released a cloud of highly charged particles containing the energy of 20 million nuclear bombs, and this solar superstorm then hit Earth; in Quebec, Canada, the lights suddenly went out.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

A new generation of survivalists are put to the test in the frozen Arctic.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

Challenging the concept of reality with new data from a supermassive black hole.

On 2nd August 1932, American physicist Dr Carl Anderson captured the first ever image of antimatter. Antimatter has only ever been glimpsed in fleeting moments because as soon as it comes into contact with matter, both annihilate.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

Challenging the concept of reality with new data from a supermassive black hole.

On 2nd August 1932, American physicist Dr Carl Anderson captured the first ever image of antimatter. Antimatter has only ever been glimpsed in fleeting moments because as soon as it comes into contact with matter, both annihilate.

Alaska residents labor their way through winter's challenges.

Scientists are using technology to research weather on other planets.

The search for a home brings tragedy and triumph as baby hippo Mafuta faces new dangers; crocodile Magamba defends her hatchlings, and Duma the cheetah struggles to make friends.

Alaska residents labor their way through winter's challenges.

Satellites follow an elephant family struggling through drought; reveals previously unknown emperor penguin colonies from the color of their poo; discovers mysterious ice rings that could put seal pups in danger.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

Satellites follow an elephant family struggling through drought; reveals previously unknown emperor penguin colonies from the color of their poo; discovers mysterious ice rings that could put seal pups in danger.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Pursued by a group of Utahraptors, a gang of armored dinosaurs battles to reach adulthood.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

When Earth first formed from clouds of dust and gas 4.6 billion years ago, it was devoid of an atmosphere, an inhospitable rock floating in the black void of space.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

On 2nd August 1932, American physicist Dr Carl Anderson captured the first ever image of antimatter. Antimatter has only ever been glimpsed in fleeting moments because as soon as it comes into contact with matter, both annihilate.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Seeking a mate, leopard Olimba begins a new chapter, but in her way is her daughter; the hyenas' strength is growing, but a flooded den spells disaster, and the clan become separated.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

Meet the people that made filming Kingdom possible and uncover the extraordinary acts of conservationists and anti-poaching teams protecting South Luangwa and all its inhabitants.

For her pups to survive, a young meerkat queen must unite her family in the face of rivals, predators and immense dust storms in the harsh beauty of the Madgadikgadi salt pans of Botswana.

A mother puma must battle rivals, tackle prey nearly three times her size and endure the wild mountain weather of Patagonia in her bid to raise four cubs, her biggest litter yet.

In Amboseli, Kenya, an incredibly rare drought event pushes a struggling elephant family to its limits as their only chance to save their dynasty is to work together and overcome the challenge of a lifetime.

On Zambia's plains, a cheetah mother and her three growing daughters must travel thousands of kilometers every year to roam their vast territory searching for food; new challenges arise as the wet season arrives and floodwaters advance.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

A look at Isaac Newton;a visit to CERN.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Pursued by a group of Utahraptors, a gang of armored dinosaurs battles to reach adulthood.

Levison and his San guide, Kane, follow ancient nomadic hunting routes to stalk the last 100 desert lions of Namibia.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Pursued by a group of Utahraptors, a gang of armored dinosaurs battles to reach adulthood.

Levison and his San guide, Kane, follow ancient nomadic hunting routes to stalk the last 100 desert lions of Namibia.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

It's time to close another chapter in the lives of the animals of the Serengeti; first, all around is a blackened wasteland, the aftermath of the huge fire.

All animal families make the most of the good times when a new oasis brings untold riches, but they face devastation when a towering inferno takes over.

A great fire leaves homes destroyed and families separated; the animal characters must find new ways to survive in an unrecognizable and inhospitable landscape.

The drama now centers around the river where enchanting new characters, including an adorable baby hippo, meet old favorites; bonds of kinship are tested as adventures continue.

The search for a home brings tragedy and triumph as baby hippo Mafuta faces new dangers; crocodile Magamba defends her hatchlings, and Duma the cheetah struggles to make friends.

Allison brings her work home; some orphans try to make a break for it while Allison and Hope are away.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Allison brings her work home; some orphans try to make a break for it while Allison and Hope are away.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Allison brings her work home; some orphans try to make a break for it while Allison and Hope are away.

Alaskans confront the environment and themselves as winter bears down.

Scientists are using technology to research weather on other planets.

As the land dries, everyone struggles to find water; the hippos get trapped in the shrinking lake, and Nalla the elephant finds a clever solution to quench everyone's thirst.

Alaskans confront the environment and themselves as winter bears down.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Head out with a team of intrepid scientists on a daring expedition off Western Australia's Pilbara coast; Slither into the heart of danger with Dr. Ann, who gets too close for comfort to one of the nation's most mysterious and lethal serpents.

A race to find the planet's 60 deadliest creatures.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

Alaskans confront the environment and themselves as winter bears down.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

As the land dries, everyone struggles to find water; the hippos get trapped in the shrinking lake, and Nalla the elephant finds a clever solution to quench everyone's thirst.

Alaskans confront the environment and themselves as winter bears down.

The open house is bigger than ever, which brings about more challenges.

The highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

The open house is bigger than ever, which brings about more challenges.

The highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

The open house is bigger than ever, which brings about more challenges.

Alaskans rediscover old practices to get through the heart of winter.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

As the animal families escape the drought, the land returns to its former beauty; new life is born, old rivalries are laid to rest, and new alliances are forged.

Alaskans rediscover old practices to get through the heart of winter.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

Dr. Ann Jones ventures into the heart of Borneo's jungle to look for wild orangutan, following a team of dedicated scientists whose work is leading to new insights into one of the world's most intelligent and elusive great apes.

Trek into the heart of the Suriname jungle with Steve and the crew, who are on the hunt for some special creatures hiding in the shadows; they search for poison dart frogs, deadly snakes and the elusive giant river otter.

The guys head to the turquoise waters of The Bahamas to try to catch venomous lionfish.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Dr. Ann Jones ventures into the heart of Borneo's jungle to look for wild orangutan, following a team of dedicated scientists whose work is leading to new insights into one of the world's most intelligent and elusive great apes.

Trek into the heart of the Suriname jungle with Steve and the crew, who are on the hunt for some special creatures hiding in the shadows; they search for poison dart frogs, deadly snakes and the elusive giant river otter.

The guys head to the turquoise waters of The Bahamas to try to catch venomous lionfish.

The highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Alaskans rediscover old practices to get through the heart of winter.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

As the animal families escape the drought, the land returns to its former beauty; new life is born, old rivalries are laid to rest, and new alliances are forged.

Alaskans rediscover old practices to get through the heart of winter.

Never seen before footage of Hope's greatest stories.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Never seen before footage of Hope's greatest stories.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Never seen before footage of Hope's greatest stories.

Alaskans take advantage of a brief reprieve from Dark Winter's wrath.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

A group of chimps in Senegal is led by an alpha male named Dave.

Alaskans take advantage of a brief reprieve from Dark Winter's wrath.

Dr. Ann Jones ventures into the heart of Borneo's jungle to look for wild orangutan, following a team of dedicated scientists whose work is leading to new insights into one of the world's most intelligent and elusive great apes.

Trek into the heart of the Suriname jungle with Steve and the crew, who are on the hunt for some special creatures hiding in the shadows; they search for poison dart frogs, deadly snakes and the elusive giant river otter.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

Levison and his San guide, Kane, follow ancient nomadic hunting routes to stalk the last 100 desert lions of Namibia.

Nominations for the Earthshot Prize to Fix Our Climate are revealed as Prince William, Sir David Attenborough and Christiana Figueres, who led negotiations for the Paris Agreement on climate change, highlight inspiring solutions.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

How dramatic twists in Earth's story enabled humans to go from being part of nature to controlling it.

Nominations for the Earthshot Prize to Fix Our Climate are revealed as Prince William, Sir David Attenborough and Christiana Figueres, who led negotiations for the Paris Agreement on climate change, highlight inspiring solutions.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

How dramatic twists in Earth's story enabled humans to go from being part of nature to controlling it.

Alaskans take advantage of a brief reprieve from Dark Winter's wrath.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

A group of chimps in Senegal is led by an alpha male named Dave.

Alaskans take advantage of a brief reprieve from Dark Winter's wrath.

A huge storm sweeps an unusual patient into Hope for Wildlife, and Hope tries to return him to his home.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

A huge storm sweeps an unusual patient into Hope for Wildlife, and Hope tries to return him to his home.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

A huge storm sweeps an unusual patient into Hope for Wildlife, and Hope tries to return him to his home.

Alaskans test their will and luck against Dark Winter's obstacles.

The guys head to the turquoise waters of The Bahamas to try to catch venomous lionfish.

A colony of emperor penguins arrive in Atka Bay, after three months at sea, to raise their chicks through the coming winter.

Alaskans test their will and luck against Dark Winter's obstacles.

Nominations for the Earthshot Prize to Fix Our Climate are revealed as Prince William, Sir David Attenborough and Christiana Figueres, who led negotiations for the Paris Agreement on climate change, highlight inspiring solutions.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

How dramatic twists in Earth's story enabled humans to go from being part of nature to controlling it.

Alaska is a challenging place, but tenacity of the spirit makes it home.

During the height of the Ice Age, one of the coldest times humanity has ever known, Homo sapiens steps into the last habitable continents on the planet: the Americas.

Levison and his San guide, Kane, follow ancient nomadic hunting routes to stalk the last 100 desert lions of Namibia.

Alaska is a challenging place, but tenacity of the spirit makes it home.

During the height of the Ice Age, one of the coldest times humanity has ever known, Homo sapiens steps into the last habitable continents on the planet: the Americas.

The guys head to the turquoise waters of The Bahamas to try to catch venomous lionfish.

Alaskans test their will and luck against Dark Winter's obstacles.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

A colony of emperor penguins arrive in Atka Bay, after three months at sea, to raise their chicks through the coming winter.

Alaskans test their will and luck against Dark Winter's obstacles.

Hope cares for the first two beavers to arrive at the rehab centre and learns the fate of her most famous patient.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

Hope cares for the first two beavers to arrive at the rehab centre and learns the fate of her most famous patient.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Seeking a mate, leopard Olimba begins a new chapter, but in her way is her daughter; the hyenas' strength is growing, but a flooded den spells disaster, and the clan become separated.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

Meet the people that made filming Kingdom possible and uncover the extraordinary acts of conservationists and anti-poaching teams protecting South Luangwa and all its inhabitants.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

Leopard Mutima's relationship with her mother is at breaking point, and as the balance of power in Nsefu tips towards the lions, the hyenas and wild dogs fight to raise their young.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

Professor Cox explores the cycles of time that define the lives of humans.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

Professor Cox explores the cycles of time that define the lives of humans.

Alaskans must rely on solid foundations to persist through Dark Winter.

Scientists search for the smallest thing in our universe.

The leader of a once mighty lion pride must now battle for their very survival; a look at whether or not this extraordinary lioness can save her family from disaster.

Alaskans must rely on solid foundations to persist through Dark Winter.

Allison brings her work home; some orphans try to make a break for it while Allison and Hope are away.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

A group of chimps in Senegal is led by an alpha male named Dave.

A colony of emperor penguins arrive in Atka Bay, after three months at sea, to raise their chicks through the coming winter.

The leader of a once mighty lion pride must now battle for their very survival; a look at whether or not this extraordinary lioness can save her family from disaster.

The leader of a great Painted Wolf family is growing old and her power to keep the peace is waning; a feud with an ambitious daughter threatens to bring the dynasty down.

Tigress Raj Bhera has four new cubs whom she must protect while battling rivals who want to steal her lands and overthrow her.

A group of chimps in Senegal is led by an alpha male named Dave.

A colony of emperor penguins arrive in Atka Bay, after three months at sea, to raise their chicks through the coming winter.

The leader of a once mighty lion pride must now battle for their very survival; a look at whether or not this extraordinary lioness can save her family from disaster.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Professor Brian Cox explores how the universe began and how it will end.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Professor Brian Cox explores how the universe began and how it will end.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Professor Brian Cox explores how the universe began and how it will end.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

Professor Cox explores the cycles of time that define the lives of humans.

The open house is bigger than ever, which brings about more challenges.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

For her pups to survive, a young meerkat queen must unite her family in the face of rivals, predators and immense dust storms in the harsh beauty of the Madgadikgadi salt pans of Botswana.

A mother puma must battle rivals, tackle prey nearly three times her size and endure the wild mountain weather of Patagonia in her bid to raise four cubs, her biggest litter yet.

In Amboseli, Kenya, an incredibly rare drought event pushes a struggling elephant family to its limits as their only chance to save their dynasty is to work together and overcome the challenge of a lifetime.

On Zambia's plains, a cheetah mother and her three growing daughters must travel thousands of kilometers every year to roam their vast territory searching for food; new challenges arise as the wet season arrives and floodwaters advance.

For her pups to survive, a young meerkat queen must unite her family in the face of rivals, predators and immense dust storms in the harsh beauty of the Madgadikgadi salt pans of Botswana.

A mother puma must battle rivals, tackle prey nearly three times her size and endure the wild mountain weather of Patagonia in her bid to raise four cubs, her biggest litter yet.

In Amboseli, Kenya, an incredibly rare drought event pushes a struggling elephant family to its limits as their only chance to save their dynasty is to work together and overcome the challenge of a lifetime.

On Zambia's plains, a cheetah mother and her three growing daughters must travel thousands of kilometers every year to roam their vast territory searching for food; new challenges arise as the wet season arrives and floodwaters advance.