As the snow melts and the ice on the waterways breaks up, the Arctic becomes a land of opportunity; the Hailstones hunt; Sue Aikens reopens her greenhouse; Glenn Villeneuve returns home.

A look at how gravity affects the world, and even the solar system.

All crews race toward the end of the season on March 31, desperate to make quota before they're forced off the ice; emotions run high as the Kristjanson crew surveys the damage and recovers what's left of Trevor's narrow gauge bomber.

As the snow melts and the ice on the waterways breaks up, the Arctic becomes a land of opportunity; the Hailstones hunt; Sue Aikens reopens her greenhouse; Glenn Villeneuve returns home.

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

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

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

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

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

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Brian Cox explores the fundamental properties of light; the secrets of the cosmos.

Alaskans must capitalize on the resources of the Arctic Summer.

All crews race toward the end of the season on March 31, desperate to make quota before they're forced off the ice; emotions run high as the Kristjanson crew surveys the damage and recovers what's left of Trevor's narrow gauge bomber.

Scientists are using technology to research weather on other planets.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

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

Will we soon find evidence of alien life? Scientists are currently in the throes of an unprecedented search for ET - and an answer to this long-pondered question may come sooner than you think.

Hunting for evidence of life beyond Earth; a look through sensitive telescopes; the detective work of scientists in the search for possible alien populations.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

Will we soon find evidence of alien life? Scientists are currently in the throes of an unprecedented search for ET - and an answer to this long-pondered question may come sooner than you think.

Hunting for evidence of life beyond Earth; a look through sensitive telescopes; the detective work of scientists in the search for possible alien populations.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Brian Cox explores the fundamental properties of light; the secrets of the cosmos.

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

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Hubble's Canvas reveals the masterpieces that abound in the universe.

Hubble's Canvas reveals the masterpieces that abound in the universe.

Griff Rhys Jones begins his exploration of Ontario and ponders why Canadians are so nice.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Hubble's Canvas reveals the masterpieces that abound in the universe.

Hubble's Canvas reveals the masterpieces that abound in the universe.

Griff Rhys Jones begins his exploration of Ontario and ponders why Canadians are so nice.

Will we soon find evidence of alien life? Scientists are currently in the throes of an unprecedented search for ET - and an answer to this long-pondered question may come sooner than you think.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

An epic journey into the unknown, a realm that feels almost like science fiction.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

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

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

Alaskans must capitalize on the resources of the Arctic Summer.

It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.

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

The team battle through the jungle into the heart of Indonesian Borneo, where a remote mountain range guards caves, holding secrets that could rewrite history.

It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.

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

The team battle through the jungle into the heart of Indonesian Borneo, where a remote mountain range guards caves, holding secrets that could rewrite history.

It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.

Will we soon find evidence of alien life? Scientists are currently in the throes of an unprecedented search for ET - and an answer to this long-pondered question may come sooner than you think.

Hunting for evidence of life beyond Earth; a look through sensitive telescopes; the detective work of scientists in the search for possible alien populations.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

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.

After being dropped into the woods with no supplies, six Indigenous strangers learn to patch birchbark canoes.

Gabriella and the others experience a wet, cold night; Elder Charlie demonstrates the art of starting fire; Michela's fears grow.

British comedian and travel enthusiast Griff Rhys Jones explores the frozen wilds of Canada's north, in the province of Manitoba.

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.

After being dropped into the woods with no supplies, six Indigenous strangers learn to patch birchbark canoes.

Gabriella and the others experience a wet, cold night; Elder Charlie demonstrates the art of starting fire; Michela's fears grow.

British comedian and travel enthusiast Griff Rhys Jones explores the frozen wilds of Canada's north, in the province of Manitoba.

Alaskans must capitalize on the resources of the Arctic Summer.

Will we soon find evidence of alien life? Scientists are currently in the throes of an unprecedented search for ET - and an answer to this long-pondered question may come sooner than you think.

Hunting for evidence of life beyond Earth; a look through sensitive telescopes; the detective work of scientists in the search for possible alien populations.

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

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

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

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

Steve and the crew travel 4,000 miles to the Loango National Park in Gabon; Steve heads out into Loango's maze of rivers on a mission to try and find an animal that is critically endangered but packs a mighty punch, the western lowland gorilla.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

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

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.

Remote islands offer sanctuary; pygmy three-toed sloth resides on a Caribbean island; nesting albatross thrive in isolation.

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

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.

Remote islands offer sanctuary; pygmy three-toed sloth resides on a Caribbean island; nesting albatross thrive in isolation.

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.

With seasons changing in the Arctic, Alaskans hunt before the spring breakup fully arrives.

As the snow melts and the ice on the waterways breaks up, the Arctic becomes a land of opportunity; the Hailstones hunt; Sue Aikens reopens her greenhouse; Glenn Villeneuve returns home.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Never seen before footage of Hope's greatest stories.

Some of the world's greatest scientists devise scenarios for destroying Earth.

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.

Never seen before footage of Hope's greatest stories.

Some of the world's greatest scientists devise scenarios for destroying Earth.

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.

Never seen before footage of Hope's greatest stories.

As the rivers melt, Alaskans try to stay ahead of the changing landscape.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

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.

The team battle through the jungle into the heart of Indonesian Borneo, where a remote mountain range guards caves, holding secrets that could rewrite history.

As the rivers melt, Alaskans try to stay ahead of the changing landscape.

Coasts are the most changeable habitats of the ocean world.

Zac and Darin test their cooking skills in Melbourne, Australia, before heading to the Torres Strait Islands to understand the impact of rising sea levels.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

Zac and Darin test their cooking skills in Melbourne, Australia, before heading to the Torres Strait Islands to understand the impact of rising sea levels.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

As the rivers melt, Alaskans try to stay ahead of the changing landscape.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Coasts are the most changeable habitats of the ocean world.

As the rivers melt, Alaskans try to stay ahead of the changing landscape.

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

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

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

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

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

Alaskans race to gather resources while battling challenges from unpredictable weather.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Zac and Darin test their cooking skills in Melbourne, Australia, before heading to the Torres Strait Islands to understand the impact of rising sea levels.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

Alaskans race to gather resources while battling challenges from unpredictable weather.

Pioneers strive to protect the ocean from the effects of human activity.

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

Bonus footage from throughout the series, including a race with a cheetah, a cute but deadly bird, and a king cobra rescue; rare occasions when things do not go to plan.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

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

Bonus footage from throughout the series, including a race with a cheetah, a cute but deadly bird, and a king cobra rescue; rare occasions when things do not go to plan.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Alaskans race to gather resources while battling challenges from unpredictable weather.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Pioneers strive to protect the ocean from the effects of human activity.

Alaskans race to gather resources while battling challenges from unpredictable weather.

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

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.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

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

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.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

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

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

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

Bonus footage from throughout the series, including a race with a cheetah, a cute but deadly bird, and a king cobra rescue; rare occasions when things do not go to plan.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

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.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

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.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

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.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

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.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

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.

Caleb Musgrave teaches the Adventurers proper shelter construction.

After a long paddle, Caleb and Brendan learn the art of net-making.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

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.

Caleb Musgrave teaches the Adventurers proper shelter construction.

After a long paddle, Caleb and Brendan learn the art of net-making.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

Contemporary issues in science are explored.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

Coasts are the most changeable habitats of the ocean world.

Pioneers strive to protect the ocean from the effects of human activity.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

The warm season provides for Alaskans.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

As Gabriella feels the effects of a lack of food, Elder Mary arrives with a gift and a teaching.

The Adventurers try bush sushi, paddle to a new island in search of food, and Gabriella is rescued on the open water.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

As Gabriella feels the effects of a lack of food, Elder Mary arrives with a gift and a teaching.

The Adventurers try bush sushi, paddle to a new island in search of food, and Gabriella is rescued on the open water.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

The warm season provides for Alaskans.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

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

Bonus footage from throughout the series, including a race with a cheetah, a cute but deadly bird, and a king cobra rescue; rare occasions when things do not go to plan.