With summer nearing its end, Alaskans kick into high gear.

Frightening ice conditions and poor weather make the early season treacherous; Justin and Mike experience a violent ice-quake that leaves them rattled; Trevor contends with other fishermen setting their nets too close to his.

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

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

Brian explores one of the greatest mysteries in physics: time.

Frightening ice conditions and poor weather make the early season treacherous; Justin and Mike experience a violent ice-quake that leaves them rattled; Trevor contends with other fishermen setting their nets too close to his.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

A feature on the Andean Altiplano, a rugged plain in Bolivia.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

A feature on the Andean Altiplano, a rugged plain in Bolivia.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

Brian questions how far humans will go in their exploration of the cosmos.

With summer nearing its end, Alaskans kick into high gear.

Frightening ice conditions and poor weather make the early season treacherous; Justin and Mike experience a violent ice-quake that leaves them rattled; Trevor contends with other fishermen setting their nets too close to his.

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

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

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.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

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.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

Brian questions how far humans will go in their exploration of the cosmos.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

The differences between the Northern and Southern Rockies.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Gros Morne National Park is the result of continental collision.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

With summer nearing its end, Alaskans kick into high gear.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

Brian explores one of the greatest mysteries in physics: time.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

With summer nearing its end, Alaskans kick into high gear.

Brian explores one of the greatest mysteries in physics: time.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

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.

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.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

An enormous fiery vortex in Redding, California, the island nation of Malta loses a natural treasure, a mysterious radioactive hotspot is discovered near Chernobyl, and an unknown force lays waste to a mountain forest in Italian Alps.

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.

The crew explores the Atacama Desert, the world's driest non-polar region.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea'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.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

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.

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.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

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

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Brian learns that the solar system was once home to two blue planets.

How wildlife adapts for survival to the seasonal shifts in the sun's intensity, from wood frogs that can freeze and thaw to Arctic wolves that thrive in the chilly darkness.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Brian learns that the solar system was once home to two blue planets.

How wildlife adapts for survival to the seasonal shifts in the sun's intensity, from wood frogs that can freeze and thaw to Arctic wolves that thrive in the chilly darkness.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

The Hailstones hide emergency supplies along their hunting and trapping routes; Sue's connection with the outside world hangs in the balance; Erik falls while gathering firewood.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

The first mammal of the year is born.

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.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

The first mammal of the year is born.

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 search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

The first mammal of the year is born.

As winter begins to fade and signs of spring appear, Alaskans must start to store supplies for the upcoming months.

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.

Asia's jungles are beautiful and exceptionally diverse, but whilst they provide shelter, food, and opportunity, they are also full of dangers and hidden threats.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

As winter begins to fade and signs of spring appear, Alaskans must start to store supplies for the upcoming months.

Going back to the far North of the planet where the largest landhabitat on Earth exists, home to great Boreal forests and the barren tundra.

Leaders and representatives of Aboriginal communities show Zac and Darin how indigenous cultures live to protect and preserve the land.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

Leaders and representatives of Aboriginal communities show Zac and Darin how indigenous cultures live to protect and preserve the land.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

As winter begins to fade and signs of spring appear, Alaskans must start to store supplies for the upcoming months.

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.

Going back to the far North of the planet where the largest landhabitat on Earth exists, home to great Boreal forests and the barren tundra.

As winter begins to fade and signs of spring appear, Alaskans must start to store supplies for the upcoming months.

Hope struggles to save a seal for the first time.

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.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Hope struggles to save a seal for the first time.

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.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Hope struggles to save a seal for the first time.

Spring is on the horizon, and the Alaskans prepare for the coming months as winter ends; Sue Aikens' snow machine crash leaves her with an uncertain future; Sue heads into town to get a diagnosis on her injury.

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.

Leaders and representatives of Aboriginal communities show Zac and Darin how indigenous cultures live to protect and preserve the land.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

Spring is on the horizon, and the Alaskans prepare for the coming months as winter ends; Sue Aikens' snow machine crash leaves her with an uncertain future; Sue heads into town to get a diagnosis on her injury.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

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

Steve heads to Zambia for the first time, where he hears hippo communication on a whole new level, spots a high-diving crocodile and meets some sniffer dogs who help prevent elephant poaching.

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

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

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

Steve heads to Zambia for the first time, where he hears hippo communication on a whole new level, spots a high-diving crocodile and meets some sniffer dogs who help prevent elephant poaching.

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

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Spring is on the horizon, and the Alaskans prepare for the coming months as winter ends; Sue Aikens' snow machine crash leaves her with an uncertain future; Sue heads into town to get a diagnosis on her injury.

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.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

Spring is on the horizon, and the Alaskans prepare for the coming months as winter ends; Sue Aikens' snow machine crash leaves her with an uncertain future; Sue heads into town to get a diagnosis on her injury.

A new volunteer and a raven become roommates at the rehab.

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.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

A new volunteer and a raven become roommates at the rehab.

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.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

A new volunteer and a raven become roommates at the rehab.

As winter becomes spring, Alaskans take advantage of the Thaw's longer days and warming temperatures.

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.

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

Steve heads to Zambia for the first time, where he hears hippo communication on a whole new level, spots a high-diving crocodile and meets some sniffer dogs who help prevent elephant poaching.

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

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

As winter becomes spring, Alaskans take advantage of the Thaw's longer days and warming temperatures.

Isolated for millions of years, Australia has a variety of unique animals, including the most dangerous bird in the world, kangaroos, wombats, koalas and predators.

The now half-grown cubs must learn the skills they'll need as adults.

A look at how the planet's limited fresh water is distributed around the globe thanks to storms, and how animals manage in the driest habitats on Earth.

People surviving in the high Himalaya, the Canadian Arctic, and the blistering Australian outback.

The now half-grown cubs must learn the skills they'll need as adults.

A look at how the planet's limited fresh water is distributed around the globe thanks to storms, and how animals manage in the driest habitats on Earth.

People surviving in the high Himalaya, the Canadian Arctic, and the blistering Australian outback.

As winter becomes spring, Alaskans take advantage of the Thaw's longer days and warming temperatures.

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.

Isolated for millions of years, Australia has a variety of unique animals, including the most dangerous bird in the world, kangaroos, wombats, koalas and predators.

As winter becomes spring, Alaskans take advantage of the Thaw's longer days and warming temperatures.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

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.

The mystery of where water comes from or how it arrived on Earth.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

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.

The mystery of where water comes from or how it arrived on Earth.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

Summer's onslaught of hunting and fishing prospects leads to hard work and unforeseen challenges.

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.

The now half-grown cubs must learn the skills they'll need as adults.

A look at how the planet's limited fresh water is distributed around the globe thanks to storms, and how animals manage in the driest habitats on Earth.

People surviving in the high Himalaya, the Canadian Arctic, and the blistering Australian outback.

Summer's onslaught of hunting and fishing prospects leads to hard work and unforeseen challenges.

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

Alaskans power through the dog days of summer.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Alaskans power through the dog days of summer.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Summer's onslaught of hunting and fishing prospects leads to hard work and unforeseen challenges.

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.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Summer's onslaught of hunting and fishing prospects leads to hard work and unforeseen challenges.

A daring deer rescue is captured on camera.

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.

How hurricanes begin and end and how technological advances are helping combat the dangers they pose.

A daring deer rescue is captured on camera.

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.

How hurricanes begin and end and how technological advances are helping combat the dangers they pose.

A daring deer rescue is captured on camera.

In Alaska, preparation is key, when winter is around the corner.

Brett and Cliff travel north to the Yukon to try their hand at logging; they aim to find a suitable number of trees that can be cut down and floated to their final destination on the main river bank.

Alaskans power through the dog days of summer.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Levison takes in the scenery in northern Pakistan's mountain valleys.

In Alaska, preparation is key, when winter is around the corner.

More than any other continent, North America is defined by extreme weather and seasonal change; for animals that live here this poses great challenges, but for those with a pioneering spirit it can also offer great rewards.

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.

A look at Isaac Newton;a visit to CERN.

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.

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.

A look at Isaac Newton;a visit to CERN.

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.

In Alaska, preparation is key, when winter is around the corner.

Brett and Cliff travel north to the Yukon to try their hand at logging; they aim to find a suitable number of trees that can be cut down and floated to their final destination on the main river bank.

More than any other continent, North America is defined by extreme weather and seasonal change; for animals that live here this poses great challenges, but for those with a pioneering spirit it can also offer great rewards.

In Alaska, preparation is key, when winter is around the corner.

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.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

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 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.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

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.

The now half-grown cubs must learn the skills they'll need as adults.

Going back to the far North of the planet where the largest landhabitat on Earth exists, home to great Boreal forests and the barren tundra.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

Isolated for millions of years, Australia has a variety of unique animals, including the most dangerous bird in the world, kangaroos, wombats, koalas and predators.

More than any other continent, North America is defined by extreme weather and seasonal change; for animals that live here this poses great challenges, but for those with a pioneering spirit it can also offer great rewards.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Alaskans power through the dog days of summer.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

Brian questions how far humans will go in their exploration of the cosmos.

Exploring the Moukalaba Doudou National Park in Gabon, in search of an undiscovered population of chimpanzees.

A new volunteer and a raven become roommates at the rehab.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

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.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

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.

A look at Isaac Newton;a visit to CERN.

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.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

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 breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

The mystery of where water comes from or how it arrived on Earth.

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 breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

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.

A look at Isaac Newton;a visit to CERN.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

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

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

Steve heads to Zambia for the first time, where he hears hippo communication on a whole new level, spots a high-diving crocodile and meets some sniffer dogs who help prevent elephant poaching.