A young recruit encounters aliens in the Nevada desert in the 1960s; he claims they were working with the US military and housed a spaceship in a secret hangar nearby.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

A salvage team discovers the mysterious remains of an enormous shipwreck near Cambridge Bay in the icy waters of the Canadian Arctic; experts investigate and uncover a cutting-edge vessel with links to one of the greatest polar explorers in history.

Aircraft pilots and passengers have a scary experience when they come into close proximity to objects that doesn't appear on radar, accelerate at dizzying speeds and then stop on a dime.

The thirty contestants have one chance to reach the final and get the chance to win the 10,000 pound coins sitting in the giant exclamation mark in the daytime quiz hosted by Rick Edwards.

Guest comic Jordin Sparks.

Guest comic Chris Lee.

This Seoul amusement park is full of rusted-out rides and unfinished renovations; forced to close due to financial problems, the park has found a second life after being used as the setting of K-pop album covers and music videos.

A sprawling military facility dotted with bunkers for miles now stands abandoned in the American heartland of Edgemont, S.D.; experts investigate and uncover a once highly-secure WWII ordnance site designed to store deadly munitions.

In Tennessee, a violent tornado touches down in downtown Nashville - interrupting a live news broadcast and raking through the city; at the Hamma Hamma Falls, a kayaker races to rescue his friend from a terrifying ordeal.

A salvage team discovers the mysterious remains of an enormous shipwreck near Cambridge Bay in the icy waters of the Canadian Arctic; experts investigate and uncover a cutting-edge vessel with links to one of the greatest polar explorers in history.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Jordin Sparks.

Guest comic Chris Lee.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

On the island of Pohnpei in Micronesia, explorers discover ancient structures hidden beneath dense vegetation; a strange glowing forest is discovered in India; an immense tunnel system is investigated in the Brazilian jungle.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

On the island of Pohnpei in Micronesia, explorers discover ancient structures hidden beneath dense vegetation; a strange glowing forest is discovered in India; an immense tunnel system is investigated in the Brazilian jungle.

Guest comic Jordin Sparks.

Guest comic Chris Lee.

In Tennessee, a violent tornado touches down in downtown Nashville - interrupting a live news broadcast and raking through the city; at the Hamma Hamma Falls, a kayaker races to rescue his friend from a terrifying ordeal.

This Seoul amusement park is full of rusted-out rides and unfinished renovations; forced to close due to financial problems, the park has found a second life after being used as the setting of K-pop album covers and music videos.

The Red Pyramid at Dahshur is a revolutionary megastructure and the first true pyramid ever constructed in Ancient Egypt; experts investigate to reveal the pharaoh who built it and the mystery behind its trailblazing design.

Aircraft pilots and passengers have a scary experience when they come into close proximity to objects that doesn't appear on radar, accelerate at dizzying speeds and then stop on a dime.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Two new fugitives, Sikh brothers Harinder and Davinder Singh, travel the UK together; they're aware of the "terrorist" stereotype of Asian men with beards and backpacks, so they mostly still within their community of extended family and friends.

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.

Mountain climbers in California find the body of a U.S. Army soldier; strange bundles of canvas and wood are discovered on an Alaskan mountain; volcanic glass is found in an unexpected place; a vital World War II weather station is uncovered.

As the deep cold persists, Alaskans must carry on their way of life.

Weighing options carefully as Rick welcomes 24 new contestants, who all want a chance to make 10,000 one-pound coins rain from the giant exclamation point on stage; seeing who wins big by keeping their cool and dodging the impossible answers.

A special episode featuring a compilation of games, moments and outtakes of never-before-seen footage.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Formerly known as one of the toughest prisons in America, this massive complex was once home to medical experiments and a chaotic hostage situation; it's better remembered as the setting for the iconic opening scene of "The Blues Brothers.".

A secret Russian military base in the Gobi Desert; a strange complex in an American wasteland; a relic high atop a mountain.

In New Zealand, the White Island volcano erupts with deadly consequences; a major storm pounds the city of Perth, triggering flash flooding, hail and a near-fatal road accident when a tree is blown on top of a driver.

Mountain climbers in California find the body of a U.S. Army soldier; strange bundles of canvas and wood are discovered on an Alaskan mountain; volcanic glass is found in an unexpected place; a vital World War II weather station is uncovered.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

A compilation of games, moments, and outtakes of never-before-seen footage.

A special episode featuring a compilation of games, moments and outtakes of never-before-seen footage.

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.

Featuring Claudia Winkleman trading quips with Chris Pratt, Saoirse-Monica Jackson, Rob Beckett, Toby Jones and Rachel Chinouriri.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

Featuring Claudia Winkleman trading quips with Chris Pratt, Saoirse-Monica Jackson, Rob Beckett, Toby Jones and Rachel Chinouriri.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

In New Zealand, the White Island volcano erupts with deadly consequences; a major storm pounds the city of Perth, triggering flash flooding, hail and a near-fatal road accident when a tree is blown on top of a driver.

Formerly known as one of the toughest prisons in America, this massive complex was once home to medical experiments and a chaotic hostage situation; it's better remembered as the setting for the iconic opening scene of "The Blues Brothers.".

Investigate a tomb in Naples that may contain a prince who inspired the legend of Dracula. Read the desperate letters of Jewish rebels hidden in an Israeli cave, tour a 6,000-year-old labyrinth in Malta, and see the oldest human burial in Africa.

Satellite images of violent vortexes above a volcanic island; a man films a dazzling heavenly vision over suburban rooftops.

Satellites capture strange shapes and colors; a wrecked spaceship in Kazakhstan; a ghost fleet in the Pacific; a dying hemlock forest in the U.S.; mystery domes in Iran; a curlicue in the midst of the Congo Basin.

Analyze fish remains found near an angry Sumatran volcano that could suggest a new human migration route; visit a prehistoric village smoked out by a forest fire, a collapsed kingdom in Turkey, and evidence of early Olympic sacrificial rituals.

The failed controlled demolition of The Clarion hotel in Las Vegas; substandard soil conditions and reclaimed land are among the reasons for construction site collapses; how construction, urbanization and heavy equipment contribute to sinkholes.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Guest comic Jeff Davis.

A medical-school dropout tries to hide his attraction to his new friend, a bubbly artist who already has a boyfriend.

Featuring Claudia Winkleman trading quips with Chris Pratt, Saoirse-Monica Jackson, Rob Beckett, Toby Jones and Rachel Chinouriri.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Sandi Toksvig gets vocal with Ed Byrne, Jimmy Carr, Judi Love and Alan Davies.

Ross Noble, Sara Pascoe and Sally Phillips join Sandi and Alan for a varied episode.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Shining the spotlight on an actor who's ready to get in the game; getting wild with an animal-themed question; a geography test.

Sandi Toksvig gets vocal with Ed Byrne, Jimmy Carr, Judi Love and Alan Davies.

Ross Noble, Sara Pascoe and Sally Phillips join Sandi and Alan for a varied episode.

Investigate a tomb in Naples that may contain a prince who inspired the legend of Dracula. Read the desperate letters of Jewish rebels hidden in an Israeli cave, tour a 6,000-year-old labyrinth in Malta, and see the oldest human burial in Africa.

A medical-school dropout tries to hide his attraction to his new friend, a bubbly artist who already has a boyfriend.

The investigation of some of the most notorious and mysterious events, in an attemp to unravel all of the possible reasons for the disasters.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Investigate a tomb in Naples that may contain a prince who inspired the legend of Dracula. Read the desperate letters of Jewish rebels hidden in an Israeli cave, tour a 6,000-year-old labyrinth in Malta, and see the oldest human burial in Africa.

Analyze fish remains found near an angry Sumatran volcano that could suggest a new human migration route; visit a prehistoric village smoked out by a forest fire, a collapsed kingdom in Turkey, and evidence of early Olympic sacrificial rituals.

The investigation of some of the most notorious and mysterious events, in an attemp to unravel all of the possible reasons for the disasters.

The failed controlled demolition of The Clarion hotel in Las Vegas; substandard soil conditions and reclaimed land are among the reasons for construction site collapses; how construction, urbanization and heavy equipment contribute to sinkholes.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Emergency personnel search for survivors after a devastating tornado hits Illinois.

Dr. Cori does emergency surgery on Bijoux, a tiny shih tzu puppy in a life-or-death situation; Dr. Allison brings her veterinarian skills to help a small northern Saskatchewan Cree community with the health of their pets.

Dr. Emma takes on her first rabbit surgery and tackles her fear of rodents; Dr. Allison and the team realize Callie the dog has more than a sore tooth when a routine dental reveals bigger problems below the surface.

Analyze fish remains found near an angry Sumatran volcano that could suggest a new human migration route; visit a prehistoric village smoked out by a forest fire, a collapsed kingdom in Turkey, and evidence of early Olympic sacrificial rituals.

A medical-school dropout tries to hide his attraction to his new friend, a bubbly artist who already has a boyfriend.

Will Kirk and Christina Trevanion take their mobile auction house on the road.

A young recruit encounters aliens in the Nevada desert in the 1960s; he claims they were working with the US military and housed a spaceship in a secret hangar nearby.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Guest comic Jordin Sparks.

Guest comic Chris Lee.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

Will Kirk and Christina Trevanion take their mobile auction house on the road.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

As the deep cold persists, Alaskans must carry on their way of life.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

Look at a New Jersey complex that once housed a military lab targeted by Soviet spies; examine a scarred Welsh coastline exploited for building materials; trek to a Greek WWII disaster site and a Peruvian palace with a dark secret.

Jennifer Marshall and Ryan Sprague investigate one of the most mysterious UFO events in U.S. history.

A massive typhoon in the Philippines; a record-breaking California wildfire; a submerged house; a lost snowboarder spends an icy night facing bears and deadly frostbite.

Look at a New Jersey complex that once housed a military lab targeted by Soviet spies; examine a scarred Welsh coastline exploited for building materials; trek to a Greek WWII disaster site and a Peruvian palace with a dark secret.

Jennifer Marshall and Ryan Sprague investigate one of the most mysterious UFO events in U.S. history.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

As the deep cold persists, Alaskans must carry on their way of life.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

Jennifer Marshall and Ryan Sprague investigate one of the most mysterious UFO events in U.S. history.

The investigation of some of the most notorious and mysterious events, in an attemp to unravel all of the possible reasons for the disasters.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Dr. Cori's team is busy when they find a mysterious scar on a new shop cat and assist a puppy who was hurt after leaping from a car. Dr. Allison discovers an infection in a dog but is less confident in her dancing abilities as she learns to jig.

Volunteering with the Mission PAWSible mobile vet unit in a remote Indigenous community, Dr. Emma manages loose dogs getting rowdy at the clinic. A routine spay takes a shocking turn when she finds a bullet in a dog.

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

Archaeologists make a grim discovery when they uncover the remains of a mummified boy buried in the frozen Siberian landscape, and as researchers continue their excavation, they uncover 88 additional graves linked to a mysterious, ancient necropolis.

UFO sightings are at an all time high; from the lights that terrorized Phoenix to the disappearance of an object into the Atlantic Ocean, these events amaze and unsettle witnesses.

Players who think they know how to unlock a big payout.

Guest comic Greg Proops.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

Notorious gunslinger John Dillinger once pulled off a daring escape from this unassuming jail; today, the story of his clash with Indiana's first female sheriff and his dramatic getaway continues to fascinate the public.

In Australia, the worst bushfires in recent history attack multiple towns - overwhelming firefighters and trapping tourists; The Philippines is usually resilient to natural disasters, but a 6.4 magnitude earthquake catches everyone off-guard.

Archaeologists make a grim discovery when they uncover the remains of a mummified boy buried in the frozen Siberian landscape, and as researchers continue their excavation, they uncover 88 additional graves linked to a mysterious, ancient necropolis.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Greg Proops.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

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

The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

Dig into artifacts from a multicultural Jamaican port sunk by a devastating earthquake; get insights into everyday Meso-American life next to a Salvadoran volcano; peek at a Minoan landmark; inspect a treasure trove of English relics.

Reviewing footage of an underground volcanic eruption in Tonga and the tsunami it triggers; mapping the path of destruction left by a giant tornado in the U.S. South; fierce storms in Europe.

The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

Dig into artifacts from a multicultural Jamaican port sunk by a devastating earthquake; get insights into everyday Meso-American life next to a Salvadoran volcano; peek at a Minoan landmark; inspect a treasure trove of English relics.

Guest comic Greg Proops.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

In Australia, the worst bushfires in recent history attack multiple towns - overwhelming firefighters and trapping tourists; The Philippines is usually resilient to natural disasters, but a 6.4 magnitude earthquake catches everyone off-guard.

Notorious gunslinger John Dillinger once pulled off a daring escape from this unassuming jail; today, the story of his clash with Indiana's first female sheriff and his dramatic getaway continues to fascinate the public.

UFO sightings are at an all time high; from the lights that terrorized Phoenix to the disappearance of an object into the Atlantic Ocean, these events amaze and unsettle witnesses.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Sizing up three rounds of answers that are right, wrong, and plain old impossible.

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

An unidentified metal object is found on Kiska Island; a centuries-old gold mining mystery is investigated; in Siberia, a network of ice tunnels is explored; fossils unearthed in the Canadian Arctic lead to the discovery of a new species.

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.

Sizing up three rounds of answers that are right, wrong, and plain old impossible.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

The secrets of a dilapidated concrete wall wedged perilously into the Italian mountains; peek at five eerie circular structures on a Cuban island; explore a former American escape route from nuclear Armageddon; a submerged link to D-Day.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

An unidentified metal object is found on Kiska Island; a centuries-old gold mining mystery is investigated; in Siberia, a network of ice tunnels is explored; fossils unearthed in the Canadian Arctic lead to the discovery of a new species.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

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

Dr. Poitras and her team rush into critical surgery to save the life of Ruger, a senior dog battling a badly infected organ; in Saskatoon, Dr. Allison helps a husky cross named Goldy who has a bad limp and a cat who has a bladder full of stones.

Sandi Toksvig takes a QI look at some vets with Tom Allen, Melanie Bracewell, Desiree Burch and Alan Davies.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

As daylight fades, Alaskans contend with threats lurking in the shadows.

Dr. Poitras and her team rush into critical surgery to save the life of Ruger, a senior dog battling a badly infected organ; in Saskatoon, Dr. Allison helps a husky cross named Goldy who has a bad limp and a cat who has a bladder full of stones.

Sandi Toksvig is joined by Maisie Adam, Jack Dee, Kiri Pritchard-McLean and Alan Davies.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

An unidentified metal object is found on Kiska Island; a centuries-old gold mining mystery is investigated; in Siberia, a network of ice tunnels is explored; fossils unearthed in the Canadian Arctic lead to the discovery of a new species.

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.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Category 4 Hurricane Laura batters Cameron, La.; its wicked winds and torrential rains reach inland to Lake Charles, La.; residents take cover as their windows break, the power goes out and storm surge takes over.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

An expedition on Europe's tallest mountain unearth a decapitated human body; experts uncover a mummified Russian WWII soldier near a wartime shelter.

Billy Meier claims he's traveled through time and space with an alien race from the Pleiades star cluster; in the decades following his revelation, both skeptics and ufologists say it's a hoax despite Meier providing photographic evidence.

Picking through a minefield of answers as challengers clash for £10,000.

Guest comic Tiffany Coyne.

Guest comic Tiffany Haddish.

Touring a South Korean mountainside retreat built in the shadow of a frozen conflict; exploring a shrine to Soviet political manipulation; checking out a recently declassified Spanish defence network; peeking inside an Argentinian guest house.

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

Heavy snow creates a treacherous situation for trekkers in the Himalayan mountains, when an earthquake-triggered avalanche sweeps into a busy base camp; in Australia, category three Cyclone Damien makes landfall and leaves a trail of destruction.

An expedition on Europe's tallest mountain unearth a decapitated human body; experts uncover a mummified Russian WWII soldier near a wartime shelter.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Tiffany Coyne.

Guest comic Tiffany Haddish.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

The investigation of some of the most notorious and mysterious events, in an attemp to unravel all of the possible reasons for the disasters.

Crawl through a notorious brick-lined tunnel system in a historic Florida neighbourhood. Open a window into the lives of elite Greek families in Naples, explore a three-story underground city in Iran, and find 2nd-century barracks buried in Rome.

Touring a South Korean mountainside retreat built in the shadow of a frozen conflict; exploring a shrine to Soviet political manipulation; checking out a recently declassified Spanish defence network; peeking inside an Argentinian guest house.

The investigation of some of the most notorious and mysterious events, in an attemp to unravel all of the possible reasons for the disasters.

Crawl through a notorious brick-lined tunnel system in a historic Florida neighbourhood. Open a window into the lives of elite Greek families in Naples, explore a three-story underground city in Iran, and find 2nd-century barracks buried in Rome.

Guest comic Tiffany Coyne.

Guest comic Tiffany Haddish.

Heavy snow creates a treacherous situation for trekkers in the Himalayan mountains, when an earthquake-triggered avalanche sweeps into a busy base camp; in Australia, category three Cyclone Damien makes landfall and leaves a trail of destruction.

Touring a South Korean mountainside retreat built in the shadow of a frozen conflict; exploring a shrine to Soviet political manipulation; checking out a recently declassified Spanish defence network; peeking inside an Argentinian guest house.

An expedition on Europe's tallest mountain unearth a decapitated human body; experts uncover a mummified Russian WWII soldier near a wartime shelter.

Billy Meier claims he's traveled through time and space with an alien race from the Pleiades star cluster; in the decades following his revelation, both skeptics and ufologists say it's a hoax despite Meier providing photographic evidence.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

Climbers make a shocking discovery when they encounter the remains of two human bodies high atop New Zealand's Mount Cook; after a forensic investigation, a decades-old mystery reignites that could rewrite mountaineering history.

Visitations that leave behind objects or witnesses give us fascinating evidence.

Rivals try to avoid a one-way ticket to elimination.

Guest comic Kaila Mullady.

Guest comic Mark Ballas.

Meeting the people who designed amazing engineering projects and those that help revive them.

Visiting a controversial natural oasis in upstate New York; spying on the classified remains of a cutting-edge government vehicle project in Colorado; exploring a doomed monument to hope in Memphis and a strange Pacific Northwest town with a secret.

Hawaii's Kilauea volcano violently erupts; Good Samaritans in Texas rescue care home residents trapped in Hurricane Harvey's deadly flood waters; in England a paddle boarder battles high winds and treacherous tides.

Climbers make a shocking discovery when they encounter the remains of two human bodies high atop New Zealand's Mount Cook; after a forensic investigation, a decades-old mystery reignites that could rewrite mountaineering history.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Kaila Mullady.

Guest comic Mark Ballas.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

In the Australian rain forests of Lake Eacham, a scientist discovers a mysterious mouse-like creature that glows in the dark; strange cylindrical tubes are uncovered in the forests of India; hundreds of human bones are found in a Belizean cave.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

In the Australian rain forests of Lake Eacham, a scientist discovers a mysterious mouse-like creature that glows in the dark; strange cylindrical tubes are uncovered in the forests of India; hundreds of human bones are found in a Belizean cave.

Guest comic Kaila Mullady.

Guest comic Mark Ballas.

Hawaii's Kilauea volcano violently erupts; Good Samaritans in Texas rescue care home residents trapped in Hurricane Harvey's deadly flood waters; in England a paddle boarder battles high winds and treacherous tides.

Meeting the people who designed amazing engineering projects and those that help revive them.

When Pompeii was destroyed by an apocalyptic volcano in 79 AD, another Roman town was destroyed as well; experts use cutting-edge tech to investigate the secrets of Vesuvius' second victim.

Visitations that leave behind objects or witnesses give us fascinating evidence.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Dr. Ricky Allen has now been on the run for 15 days and the hunters are getting frustrated; Peter Bleksley launches a concerted media campaign to flush Ricky out.

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 new theory about the sinking of the Titanic emerges; a treeless circle in the middle of the woods is probed; a formation of giant whale bones is discovered sticking out of the ground; researchers study the loudest sound ever recorded underwater.

As daylight fades, Alaskans contend with threats lurking in the shadows.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

On a picturesque island off the coast of Brazil, this penal colony was once the site of a dramatic prisoner uprising; among the ruins lies the story of the violent rebellion and the recapturing of the island by military forces.

A Montana small town branded by an infamous jailbreak; how nature trumped greed during an Alaska treasure hunt; a cultural icon from the rough side of New Orleans; the Empire State of the South.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

A new theory about the sinking of the Titanic emerges; a treeless circle in the middle of the woods is probed; a formation of giant whale bones is discovered sticking out of the ground; researchers study the loudest sound ever recorded underwater.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Greg Proops.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

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 compilation of highlights from the series, featuring a host of stars, including Demi Moore, Timothée Chalamet, Cher, Denzel Washington, Nicole Kidman and many more.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Using canal towpaths, Stephen Hardiker and Martin Cole make their escape and travel almost 100 miles to a caravan in Wales.

A compilation of highlights from the series, featuring a host of stars, including Demi Moore, Timothée Chalamet, Cher, Denzel Washington, Nicole Kidman and many more.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Using canal towpaths, Stephen Hardiker and Martin Cole make their escape and travel almost 100 miles to a caravan in Wales.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

On a picturesque island off the coast of Brazil, this penal colony was once the site of a dramatic prisoner uprising; among the ruins lies the story of the violent rebellion and the recapturing of the island by military forces.

Crawl through a notorious brick-lined tunnel system in a historic Florida neighbourhood. Open a window into the lives of elite Greek families in Naples, explore a three-story underground city in Iran, and find 2nd-century barracks buried in Rome.

A twisting swarm of menacing aerial creatures glides above the suburbs; bizarrely parting seas suggest connections to ancient legends; a volcano produces deadly hair-like fibers.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Dig into artifacts from a multicultural Jamaican port sunk by a devastating earthquake; get insights into everyday Meso-American life next to a Salvadoran volcano; peek at a Minoan landmark; inspect a treasure trove of English relics.

Experts investigate a fiery overpass collapse in Philadelphia, a plummeting radio telescope and a building collapse crisis in Nigeria.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Tiffany Coyne.

Guest comic Tiffany Haddish.

A scruffy superhero named Hancock (Will Smith) protects the citizens of Los Angeles but leaves horrendous collateral damage in the wake of every well-intentioned feat. That's OK with Hancock; he doesn't care what people think and is just as likely to be found dozing on a park bench as saving a damsel in distress. However, after saving the life of a PR executive (Jason Bateman) and meeting the man's beautiful wife (Charlize Theron), he realizes that he may have a sensitive side after all.

A compilation of highlights from the series, featuring a host of stars, including Demi Moore, Timothée Chalamet, Cher, Denzel Washington, Nicole Kidman and many more.

Caroline Aherne narrates as some of Britain's most opinionated viewers comment freely.

Sandi Toksvig takes a QI look at some vets with Tom Allen, Melanie Bracewell, Desiree Burch and Alan Davies.

Sandi Toksvig is joined by Maisie Adam, Jack Dee, Kiri Pritchard-McLean and Alan Davies.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Players who think they know how to unlock a big payout.

Sandi Toksvig takes a QI look at some vets with Tom Allen, Melanie Bracewell, Desiree Burch and Alan Davies.

Sandi Toksvig is joined by Maisie Adam, Jack Dee, Kiri Pritchard-McLean and Alan Davies.