The 24 hopefuls try to keep their cool for a chance to win big money.

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.

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.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Wildfires devastate the seaside village of Mati in Greece; monster hail pummels tourists and zoo animals in Colorado; hikers in Turkey fight for survival after they're stranded by a flash flood; a tornado rips off roofs and catapults cars in Canada.

A top-secret military base hidden deep in the ice beyond the Arctic Circle is one of the Cold War's most elaborate cover-ups; recently declassified documents reveal its deadly purpose; the threat it might still pose to all humankind.

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.

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.

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.

Keira Knightley, Malala Yousafzai, Aimee Lou Wood, Chris McCausland and musical guest Mumford & Sons with Hozier.

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

Olympic gold medalist Misty May-Treanor; guest comics Brad Sherwood and Jeff Davis.

Special guests Penn & Teller.

Keira Knightley, Malala Yousafzai, Aimee Lou Wood, Chris McCausland and musical guest Mumford & Sons with Hozier.

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

The runaways choose to find comfort in the familiar, which could prove to be a bad move when Ayo decides to go home and see his family.

Wildfires devastate the seaside village of Mati in Greece; monster hail pummels tourists and zoo animals in Colorado; hikers in Turkey fight for survival after they're stranded by a flash flood; a tornado rips off roofs and catapults cars in Canada.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Huge sand dunes bellow sinister sounds as loud as a jackhammer; a churning mud pot mysteriously goes on a rampage, destroying infrastructure; and a river, linked to a national tragedy, mysteriously vanishes.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Earthquake-proof buildings fall down; a battery factory blows up; and a bridge collapses.

A giant naval vessel on the bottom of the Norwegian Sea; an ancient reptile-like creature unknown to science in the permafrost of Canada's Arctic; a figure-eight-shaped ditch in Scotland; an Antarctic research base surrounded by blood-soaked 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.

Olympic gold medalist Misty May-Treanor; guest comics Brad Sherwood and Jeff Davis.

Paid programming.

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

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Keira Knightley, Malala Yousafzai, Aimee Lou Wood, Chris McCausland and musical guest Mumford & Sons with Hozier.

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

Sandi Toksvig joins Bridget Christie, Rosie Jones, Cariad Lloyd and Alan Davies to find out about Ulex and other obscure U words.

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

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.

Sandi Toksvig joins Bridget Christie, Rosie Jones, Cariad Lloyd and Alan Davies to find out about Ulex and other obscure U words.

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

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Tripper is the head counselor at a budget summer camp called Camp Northstar. In truth, he's young at heart and only marginally more mature than the campers themselves. Tripper befriends Rudy, a loner camper who has trouble fitting in. As Tripper inspires his young charges to defeat rival Camp Mohawk in the annual Olympiad competition, Rudy plays matchmaker between Tripper and Roxanne, a female counselor at Northstar.

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

A giant naval vessel on the bottom of the Norwegian Sea; an ancient reptile-like creature unknown to science in the permafrost of Canada's Arctic; a figure-eight-shaped ditch in Scotland; an Antarctic research base surrounded by blood-soaked snow.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

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

Earthquake-proof buildings fall down; a battery factory blows up; and a bridge collapses.

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.

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.

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.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

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

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Guest comic Jack Osbourne.

Paid programming.

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.

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

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

Zoe Lyons, Dan Tiernan, and Josh Widdicombe join Sandi.

Sandi Toksvig hosts as "QI" goes voyaging with Nabil Abdulrashid, Joe Lycett, Lou Sanders and Alan Davies.

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

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

As winter turns to spring, Alaskans must seize the warming days.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

In Michigan, a top-secret military base embroiled in an unexplained disappearance; an Italian wonderland, shattered by links to the Mafia; a California transportation hub that inspired lasting change; and a Croatian complex drawn into a brutal conflict.

Dive into Puerto Rico's coastal waters, where the team investigates a leaked video of a mysterious craft plunging into the ocean. Then go on a harrowing nighttime hunt to find out if tales of alien underwater bases are true or just a local myth.

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

In Michigan, a top-secret military base embroiled in an unexplained disappearance; an Italian wonderland, shattered by links to the Mafia; a California transportation hub that inspired lasting change; and a Croatian complex drawn into a brutal conflict.

Dive into Puerto Rico's coastal waters, where the team investigates a leaked video of a mysterious craft plunging into the ocean. Then go on a harrowing nighttime hunt to find out if tales of alien underwater bases are true or just a local myth.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

As winter turns to spring, Alaskans must seize the warming days.

The runaways choose to find comfort in the familiar, which could prove to be a bad move when Ayo decides to go home and see his family.

Dive into Puerto Rico's coastal waters, where the team investigates a leaked video of a mysterious craft plunging into the ocean. Then go on a harrowing nighttime hunt to find out if tales of alien underwater bases are true or just a local myth.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all 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.

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.

Experts make a chilling new discovery when they unearth a 30,000-year-old zombie virus from an icy grave; if this ancient disease is successfully resuscitated back to life, it could cause a catastrophic global calamity.

Local authorities receive more than 50 UFO reports in the Chicago area on Halloween night, many record video of the bizarre lights; Multiple sightings of a large flying craft in Pennsylvania.

Four US Air Force reservists are chased by strange lights while flying back to their base in Cleveland; Constable Alan Godfrey loses consciousness when he investigates a mysterious disruption in West Yorkshire.

Players think they know how to unlock a big payout.

Guest comedian Rachel Bloom.

Guest comic Mircea Monroe.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Encounter kids' drawings on the walls in Pompeii that expose the city's violent gladiatorial past; check out a mythical sculpture unearthed by an Indian tsunami, a 12-century temple in quake-prone Mexico; a sunken ship in Utah's Great Salt Lake.

Hurricane Michael rips across the Florida panhandle, trapping a storm chaser; the UK coast guard battles gale force winds to save fishermen stranded on the hull of their capsized trawler; an adventurer suffers extreme heat stroke in the Gobi Desert.

Experts make a chilling new discovery when they unearth a 30,000-year-old zombie virus from an icy grave; if this ancient disease is successfully resuscitated back to life, it could cause a catastrophic global calamity.

Encounter kids' drawings on the walls in Pompeii that expose the city's violent gladiatorial past; check out a mythical sculpture unearthed by an Indian tsunami, a 12-century temple in quake-prone Mexico; a sunken ship in Utah's Great Salt Lake.

Hurricane Michael rips across the Florida panhandle, trapping a storm chaser; the UK coast guard battles gale force winds to save fishermen stranded on the hull of their capsized trawler; an adventurer suffers extreme heat stroke in the Gobi Desert.

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 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.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Severe flooding forces families across Europe onto their rooftops; a Nepali avalanche; deadly wildfires in the Sierra Nevada; an eastern U.S. whiteout that strands motorists for 24 hours in their cars.

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.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Guest comedian Rachel Bloom.

Guest comic Mircea Monroe.

Hurricane Michael rips across the Florida panhandle, trapping a storm chaser; the UK coast guard battles gale force winds to save fishermen stranded on the hull of their capsized trawler; an adventurer suffers extreme heat stroke in the Gobi Desert.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Experts make a chilling new discovery when they unearth a 30,000-year-old zombie virus from an icy grave; if this ancient disease is successfully resuscitated back to life, it could cause a catastrophic global calamity.

Local authorities receive more than 50 UFO reports in the Chicago area on Halloween night, many record video of the bizarre lights; Multiple sightings of a large flying craft in Pennsylvania.

Four US Air Force reservists are chased by strange lights while flying back to their base in Cleveland; Constable Alan Godfrey loses consciousness when he investigates a mysterious disruption in West Yorkshire.

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.

Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.

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.

After a 2,500-year-old mummy is discovered in Siberia, locals report strange, cataclysmic events that point to an ancient curse; using cutting-edge archaeology, experts reveal who this person was and if they've unleashed something sinister.

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.

Sizing up answers with the contestants, who are sure they know what's right, what's wrong, and what's plain old impossible; battling through three mind-bending rounds of competition.

Wayne Brady, Ryan Stiles Colin Mochrie and guest performer Greg Proops are joined by star guest Kat Graham to put their comedic skills to the test through a series of spontaneous improv games.

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

Touring a Miami suburb that began as a dream and became a nightmare; visiting a glitzy Beirut high-rise consumed by hate and fear; learning why armed raiders targeted an English pirate vessel.

Explore evidence that ties a meteor strike to a Biblical tale; delve into a treasure-filled tunnel revealed by a sinkhole in Mexico, a medieval cave shrine exposed during a UK landslide and famine warnings brought to light by a severe drought.

As the deadliest wildfire in Californian history tears across the state, one man battles the flames in a bid to save his home; a tornado tears apart a woman's home in Arkansas; in Uruguay, a helicopter rescue team tries to reach a trapped canoeist.

After a 2,500-year-old mummy is discovered in Siberia, locals report strange, cataclysmic events that point to an ancient curse; using cutting-edge archaeology, experts reveal who this person was and if they've unleashed something sinister.

Explore evidence that ties a meteor strike to a Biblical tale; delve into a treasure-filled tunnel revealed by a sinkhole in Mexico, a medieval cave shrine exposed during a UK landslide and famine warnings brought to light by a severe drought.

As the deadliest wildfire in Californian history tears across the state, one man battles the flames in a bid to save his home; a tornado tears apart a woman's home in Arkansas; in Uruguay, a helicopter rescue team tries to reach a trapped canoeist.

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 Chihuahua named Maggie needs eye care as Dr. Allison assesses a wound on Tag, another dog; a farm dog gets an ultrasound to check for pregnancy.

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

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.

Alaskans look to restock their food supplies as spring brings longer days.

A Chihuahua named Maggie needs eye care as Dr. Allison assesses a wound on Tag, another dog; a farm dog gets an ultrasound to check for pregnancy.

Aisling Bea, Mark Watson and Michelle Wolf join Sandi Toksvig and Alan Davis for a volatile episode.

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.

Wayne Brady, Ryan Stiles Colin Mochrie and guest performer Greg Proops are joined by star guest Kat Graham to put their comedic skills to the test through a series of spontaneous improv games.

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

As the deadliest wildfire in Californian history tears across the state, one man battles the flames in a bid to save his home; a tornado tears apart a woman's home in Arkansas; in Uruguay, a helicopter rescue team tries to reach a trapped canoeist.

Touring a Miami suburb that began as a dream and became a nightmare; visiting a glitzy Beirut high-rise consumed by hate and fear; learning why armed raiders targeted an English pirate vessel.

After a 2,500-year-old mummy is discovered in Siberia, locals report strange, cataclysmic events that point to an ancient curse; using cutting-edge archaeology, experts reveal who this person was and if they've unleashed something sinister.

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.

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.

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.

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

Three graves are discovered on the frozen beach of an uninhabited Arctic island; the mummified corpses inside may answer a centuries-old mystery of an expedition that was literally consumed by the cannibalistic insanity of its mutinous crew.

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 the challengers clash for 10,000 pounds.

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.

An eerie set of buildings in Paris is evidence of an unspeakable evil; new discoveries reveal the horrific things that happened here, and why they were abandoned.

Encounter kids' drawings on the walls in Pompeii that expose the city's violent gladiatorial past; check out a mythical sculpture unearthed by an Indian tsunami, a 12-century temple in quake-prone Mexico; a sunken ship in Utah's Great Salt Lake.

A twister traps teachers and pupils at an American school; wildfires rip across the moors in the north of England; in Argentina, a trek nearly ends in tragedy for a group of hikers; in Africa, a man is on a mission to descend into a volcano.

Three graves are discovered on the frozen beach of an uninhabited Arctic island; the mummified corpses inside may answer a centuries-old mystery of an expedition that was literally consumed by the cannibalistic insanity of its mutinous crew.

Encounter kids' drawings on the walls in Pompeii that expose the city's violent gladiatorial past; check out a mythical sculpture unearthed by an Indian tsunami, a 12-century temple in quake-prone Mexico; a sunken ship in Utah's Great Salt Lake.

A twister traps teachers and pupils at an American school; wildfires rip across the moors in the north of England; in Argentina, a trek nearly ends in tragedy for a group of hikers; in Africa, a man is on a mission to descend into a volcano.

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

A thousand-year-old Italian tower is brought to the brink of collapse; a Viking stronghold in Greenland, inexplicably abandoned; the ghost WWII bomber that vanishes on its return to base.

Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.

An eerie set of buildings in Paris is evidence of an unspeakable evil; new discoveries reveal the horrific things that happened here, and why they were abandoned.

A thousand-year-old Italian tower is brought to the brink of collapse; a Viking stronghold in Greenland, inexplicably abandoned; the ghost WWII bomber that vanishes on its return to base.

Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.

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.

A twister traps teachers and pupils at an American school; wildfires rip across the moors in the north of England; in Argentina, a trek nearly ends in tragedy for a group of hikers; in Africa, a man is on a mission to descend into a volcano.

An eerie set of buildings in Paris is evidence of an unspeakable evil; new discoveries reveal the horrific things that happened here, and why they were abandoned.

Three graves are discovered on the frozen beach of an uninhabited Arctic island; the mummified corpses inside may answer a centuries-old mystery of an expedition that was literally consumed by the cannibalistic insanity of its mutinous crew.

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.

Plop down with a fresh batch of Googleboxers and a week's worth of episodes; check out their critiques of The Celebrity Traitors; Strictly Come Dancing; Hollyoaks; Dragons' Den; Beat the Chasers; Celebrity Help! My House Is Haunted; and BBC News.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

When strange towers of ice are found growing in a barren, water-starved desert, experts speculate why these structures have uncanny similarities to extraterrestrial formations recently discovered on Pluto's alien landscape.

Confronting an aggressive, barn-size UFO and a bizarre whistling flying saucer.

On New Year's Eve, Texans report a series of flashing lights falling from the heavens; investigating an alien craft that allegedly cured a French doctor's injury without ever touching him.

Game show presented by Rick Edwards in which questions have a correct, an incorrect and an impossible answer.

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.

Seeing the home of a hush-hush Alabama fraternal organization that changed America and a testament to Allied heroism in North America; looking around a once lavish Beirut complex scarred by tragedy; visiting an elite leadership centre in Greece.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

A deadly volcano eruption causes catastrophic destruction, and a tornado flips cars on a highway.

When strange towers of ice are found growing in a barren, water-starved desert, experts speculate why these structures have uncanny similarities to extraterrestrial formations recently discovered on Pluto's alien landscape.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

A deadly volcano eruption causes catastrophic destruction, and a tornado flips cars on a highway.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

A grim discovery in a Swedish lake reveals ancient practices; in the Canadian Arctic, the fossil of a previously unknown mammal is found; bizarre ice formations in the Antarctic Ocean; a discovery off the east coast of Canada.

In the remote Cagayan Valley of the Philippines, archaeologists discover the remains of an ancient rhinoceros; a Brazilian island is infested with thousands of deadly vipers; researchers uncover shocking human remains deep in a Kenyan cave.

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

A grim discovery in a Swedish lake reveals ancient practices; in the Canadian Arctic, the fossil of a previously unknown mammal is found; bizarre ice formations in the Antarctic Ocean; a discovery off the east coast of Canada.

In the remote Cagayan Valley of the Philippines, archaeologists discover the remains of an ancient rhinoceros; a Brazilian island is infested with thousands of deadly vipers; researchers uncover shocking human remains deep in a Kenyan cave.

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.

A deadly volcano eruption causes catastrophic destruction, and a tornado flips cars on a highway.

Seeing the home of a hush-hush Alabama fraternal organization that changed America and a testament to Allied heroism in North America; looking around a once lavish Beirut complex scarred by tragedy; visiting an elite leadership centre in Greece.

The Dendera Temple is one of the best-preserved temples in all of Egypt; experts decipher its mystifying zodiac images and uncover the ceremonial events that took place at this sacred site, and stunning CGI rebuilds this grand complex in its prime.

Confronting an aggressive, barn-size UFO and a bizarre whistling flying saucer.

On New Year's Eve, Texans report a series of flashing lights falling from the heavens; investigating an alien craft that allegedly cured a French doctor's injury without ever touching him.

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.

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.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

Preserved in the ice of Mexico's highest peak, a group of climbers stumble upon the bizarre, mummified remains of a man in a pinstripe business suit; experts uncover possible drug cartel connections and a plane crash shrouded in secrecy.

The last remaining fugitives must reach a pre-arranged extraction point to evade capture; with seven days to go, the hunters ramp up their efforts.

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.

Wayne Brady, Ryan Stiles Colin Mochrie and guest performer Greg Proops are joined by star guest Kat Graham to put their comedic skills to the test through a series of spontaneous improv games.

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

Exploring the drug-war front lines in Panama and an Alpine utopia with a dark past; visiting Poland for a peek inside a revolutionary prison; getting close to a Tunisian monument.

Visit Cambodia, where record droughts have left a trade hub exposed; examine a submerged funerary complex in Greece, ancient mammal footprints preserved by a Turkish volcanic eruption and North American fossils from the post-dinosaur era.

Flash floods tear through Maryland in the US, a couple get stranded in a Himalayan blizzard, and a boat race is besieged by a rare weather phenomenon.

Preserved in the ice of Mexico's highest peak, a group of climbers stumble upon the bizarre, mummified remains of a man in a pinstripe business suit; experts uncover possible drug cartel connections and a plane crash shrouded in secrecy.

Visit Cambodia, where record droughts have left a trade hub exposed; examine a submerged funerary complex in Greece, ancient mammal footprints preserved by a Turkish volcanic eruption and North American fossils from the post-dinosaur era.

Flash floods tear through Maryland in the US, a couple get stranded in a Himalayan blizzard, and a boat race is besieged by a rare weather phenomenon.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

Glen Powell in dystopian action thriller "The Running Man"; Brit Rosamund Pike in "Now You See Me: Now You Don't"; Jack Whitehall, starring in "Malice"; and Ed Sheeran, who performs from his album "Play.".

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

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.

Glen Powell in dystopian action thriller "The Running Man"; Brit Rosamund Pike in "Now You See Me: Now You Don't"; Jack Whitehall, starring in "Malice"; and Ed Sheeran, who performs from his album "Play.".

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

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.

Flash floods tear through Maryland in the US, a couple get stranded in a Himalayan blizzard, and a boat race is besieged by a rare weather phenomenon.

Exploring the drug-war front lines in Panama and an Alpine utopia with a dark past; visiting Poland for a peek inside a revolutionary prison; getting close to a Tunisian monument.

Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.

In the Arctic Circle eerie multicolored lights move across the night sky, highway streetlights inexplicably start swaying wildly, threatening motorists and a perfectly circular beach and ocean appear in dense forest.

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

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

Watching "The Inheritance," "Long Lost Family," "Unknown Number: The High School Catfish," "The Yorkshire Vet," "Dish It Out" and "Street Cops: Catching the Troublemakers.".

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.

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

The first sightings of the UFO flap in Piedmont, Mo. are reported; Over 500 reports are made in the following months; A family driving to Ontario encounters mysterious lights and a cigar-shaped craft.

Paid programming.

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.

The West Coast is home to the San Andreas fault, stretching for almost a thousand miles beneath the feet of millions of Americans.

Hurricanes, droughts and storms reveal strange mysteries, relics and artifacts.

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.

Fails include an overpass fire, a downed radio telescope and a sinking airport.

Fails include a disastrous shuttle mission, and an unwanted and very expensive airport.

Volunteers unearth tunnel systems, and a sealed burial tomb is found.

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

Aisling Bea, Mark Watson and Michelle Wolf join Sandi Toksvig and Alan Davis for a volatile episode.

Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.

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.

Fails include an overpass fire, a downed radio telescope and a sinking airport.

Fails include a disastrous shuttle mission, and an unwanted and very expensive airport.

Volunteers unearth tunnel systems, and a sealed burial tomb is found.

A thousand-year-old Italian tower is brought to the brink of collapse; a Viking stronghold in Greenland, inexplicably abandoned; the ghost WWII bomber that vanishes on its return to base.

Unable to accept the fact that her daughter is dying, Rose (Radha Mitchell) decides to take the girl to a faith healer. On the way, the pair drive through a portal in reality, leading to an eerie town called Silent Hill. The town is surrounded by a potent darkness, and the human survivors fight a losing battle against it.

Confronting an aggressive, barn-size UFO and a bizarre whistling flying saucer.

Hurricanes, droughts and storms reveal strange mysteries, relics and artifacts.

Three men vanish from a remote Scottish lighthouse; dozens of mines explode simultaneously during the Vietnam War, for no apparent reason; ten billion snow crabs disappear from the Bering Sea.

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

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

The West Coast is home to the San Andreas fault, stretching for almost a thousand miles beneath the feet of millions of Americans.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Cousins Billy and John Smith encounter a massive ship triple the size of a football stadium; guards at Malmstrom Air Force Base in Montana spot an unidentified object overhead.

Paid programming.

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

Squaring off on national parks, Downton Abbey, musical theatre and human anatomy.

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.

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.

Explorers discover tunnel systems, a sprawling city, and military barracks.

Volunteers unearth tunnel systems, and a sealed burial tomb is found.

Explorers find a tunnel system, mass graves, city foundations, and longhouses.

The last remaining fugitives must reach a pre-arranged extraction point to evade capture; with seven days to go, the hunters ramp up their efforts.

A dilapidated mansion in Virginia, raided during the Civil War; the nerve center of a heroic rescue mission in England; palatial ruins in Estonia that hosted a formidable empress; and a fitness facility in Detroit where a champion made his name.

Board a WW II aircraft carrier and find out why a ghost orb flew through the captain's office. Tour the huge ship to learn about sailors who tragically died in battle, then watch Jennifer's team try to make contact with spirits in the engine room.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

A dilapidated mansion in Virginia, raided during the Civil War; the nerve center of a heroic rescue mission in England; palatial ruins in Estonia that hosted a formidable empress; and a fitness facility in Detroit where a champion made his name.

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.

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.

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

Explorers find a tunnel system, mass graves, city foundations, and longhouses.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

A thousand-year-old Italian tower is brought to the brink of collapse; a Viking stronghold in Greenland, inexplicably abandoned; the ghost WWII bomber that vanishes on its return to base.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.

Contractor Mike Holmes joins forces with his children, Michael and Sherry, to continue his legacy of making it right and helping homeowners in need.

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.

Three men vanish from a remote Scottish lighthouse; dozens of mines explode simultaneously during the Vietnam War, for no apparent reason; ten billion snow crabs disappear from the Bering Sea.

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

New York City is under attack as Hurricanes Ida and Ian unleash their fury on innocent people; seeing how the latest science and technology can protect New York City's 8 million residents before everything gets swept away by ferocious superstorms.

New York City is under attack as Hurricanes Ida and Ian unleash their fury on innocent people; seeing how the latest science and technology can protect New York City's 8 million residents before everything gets swept away by ferocious superstorms.

Encounter kids' drawings on the walls in Pompeii that expose the city's violent gladiatorial past; check out a mythical sculpture unearthed by an Indian tsunami, a 12-century temple in quake-prone Mexico; a sunken ship in Utah's Great Salt Lake.

Contractor Mike Holmes joins forces with his children, Michael and Sherry, to continue his legacy of making it right and helping homeowners in need.

The Holmes team surprises superfan Michael, who has autism, with news that he's part of the crew; his family gets a life-changing upgrade that will open up their tired bungalow and give them more room for living.

Dealing with toxic fallout after a hot real estate market forces Jason and Alisha to buy a house without getting a home inspection; the Holmes team transforms a moldy, radon-filled eyesore into a cozy, healthy place to raise a family.

A buried ship, wartime cellars, jar burials and mass graves are excavated.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.