Fortune smiles on a cash-strapped Mike and Alison when a TV company comes calling looking for an old house in which to film their period drama; to get the money, Alison must ensure the shoot proceeds without a hitch.

The legendary metropolis of Xanadu and its fabled existence have mystified experts for centuries; archaeologists use cutting-edge aerial imaging to investigate new discoveries and reveal the truth behind this mythical lost city.

A flying object caught on U.S. government cameras; a strange sound traveling through 5,000 miles of ocean; the sighting of an apparent ghost ship floating in Lake Superior.

Examining whether centuries-old photos are proof that reincarnation is actually occurring; whether nuclear waste off the coast of Russia could be creating an army of mutant fish; secret government space weapons.

In Nebraska, a dam goes up against mother nature; tragedy in Germany, as an alpine ice rink roof collapses in seconds; a toxic wave washes through a community; one of the world's biggest bridges crashes to earth in Canada.

A strange footprint and a foul smell; a mysterious cluster of mounds on the moon; a whisper heard in the desert that resembles an ancient pharaoh's curse.

A strange figure caught on a security cam; a statue that appears to be crying real tears; a smartphone app said to allow people to control reality.

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.

Stephen Fry masters mathematics with Sandi Toksvig, Aisling Bea, Susan Calman and Alan Davies.

Stephen Fry makes merry with marriage and mating with guests Jo Brand, Greg Davies, Bill Bailey, and Alan Davies.

Actor Peter Stormare and historian Elroy Balgaard investigate the man accused of forging evidence of Vikings in America, testing a crucial piece of evidence with DNA analysis: an ancient skull that may have alien origins.

Stephen Fry muddles through the middle show with Aisling Bea, Danny Bhoy, Jimmy Carr and Alan Davies.

Stephen Fry conjures up some seasonal merriment with Jenny Eclair, Johnny Vegas, Bill Bailey and Alan Davies.

Look over Seahenge, a Bronze Age timber circle exposed by England's rising seas. Assess an ancient Ukrainian canoe lifted by flood waters, human remains trapped in a Chinese mudslide, and a forgotten relic on the dried-out bottom of Lake Mead.

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

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, and a sunken ship in Utah's Great Salt Lake.

Taking on cricket trivia, Brad Pitt's filmography and a pop song speed challenge.

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.

Special guests Penn & Teller.

Guest comic Jack Osbourne.

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, and a sunken ship in Utah's Great Salt Lake.

Guest comic Keegan-Michael Key.

Guest comedian Rachel Bloom.

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.

Taking on cricket trivia, Brad Pitt's filmography and a pop song speed challenge.

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.

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

Scientists, historians and archeologists attempt to unravel mysteries of history.

Frank Hathaway finds an unlikely partner in Lu Shakespeare when the pair are thrown together.

Chase down a weasel and her tiny kittens who have gone AWOL at the rehab. Hold your breath as Dr. Mikaela performs a rare medical procedure on a raccoon's injured tail, then meet Hope's new otter friend and the tiniest beaver the team has ever seen.

Frank and Lu encounter hapless assistants and spirited geriatrics when investigating the death of a care home worker.

The true purpose of a 3,500-year-old ornamented box; examining if a gun powered by steam can revolutionise warfare; figuring out if a carved stone monument is the throne of the famous Aztec ruler.

Stephen Fry masters mathematics with Sandi Toksvig, Aisling Bea, Susan Calman and Alan Davies.

Stephen Fry makes merry with marriage and mating with guests Jo Brand, Greg Davies, Bill Bailey, and Alan Davies.

Opulent remains in a still-active no man's land; two moldering bastions with a hopeful tale; a frozen shell built on a burning passion; a mountainside refuge that God allegedly revealed to the world.

Stephen Fry muddles through the middle show with Aisling Bea, Danny Bhoy, Jimmy Carr and Alan Davies.

Stephen Fry conjures up some seasonal merriment with Jenny Eclair, Johnny Vegas, Bill Bailey and Alan Davies.

Check in with the Holmes team as they make upgrades to Linda and Stuart's home that will help Linda get back to life after a surprise leg amputation. Feel the relief as they create wheelchair-accessible spaces and remove barriers to her independence.

It's Cake Week, and the bakers are challenged to produce a layer cake, a chocolate cake and a sponge showstopper that features a menagerie of animals.

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.

It's Biscuit Week and the bakers make a marshmallow-based signature challenge, a custard classic in the technical; in an illusion-themed showstopper, the bakers make their favorite meal out of biscuits.

Trace the chain of events that led to a deadly explosion on the Deepwater Horizon rig and unleashed the largest marine oil spill in history; see the failed part that caused the NASA Challenger Space Shuttle to explode seconds after liftoff.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

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.

A notorious tragedy leads to one of the darkest chapters in early American history; in 1692, fear rips through the small town of Salem, Massachusetts; accusations fly and many people are put to death.

It's Cake Week, and the bakers are challenged to produce a layer cake, a chocolate cake and a sponge showstopper that features a menagerie of animals.

Guest comedian Rachel Bloom.

Sign off.

A notorious tragedy leads to one of the darkest chapters in early American history; in 1692, fear rips through the small town of Salem, Massachusetts; accusations fly and many people are put to death.

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.

Taking on cricket trivia, Brad Pitt's filmography and a pop song speed challenge.

Stephen Fry masters mathematics with Sandi Toksvig, Aisling Bea, Susan Calman and Alan Davies.

Stephen Fry makes merry with marriage and mating with guests Jo Brand, Greg Davies, Bill Bailey, and Alan Davies.

Stephen Fry muddles through the middle show with Aisling Bea, Danny Bhoy, Jimmy Carr and Alan Davies.

Stephen Fry conjures up some seasonal merriment with Jenny Eclair, Johnny Vegas, Bill Bailey and Alan Davies.

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

Taking on cricket trivia, Brad Pitt's filmography and a pop song speed challenge.

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.

As climate change has accelerated, weather has mutated and become more dangerous and unpredictable.

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

Contractor extraordinaire Mike Holmes has helped hundreds of people get the home or renovation they deserve, but now the homeowner who needs a hand is his son Mike Jr (MJ). "Holmes & Holmes" documents their working and personal relationship as they tackle the renovation of MJ's 750-square-foot bungalow so he and girlfriend Lisa can have a place of their own to start a family. Of course, no sooner is MJ's modest fix-up turned upside down by Mike's ambitious plans to gut the house and add a second story. Each hourlong episode focuses on one stage of the construction process and showcases the latest construction materials and build techniques.

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

Personal stories of those caught up in sometimes deadly natural catastrophes, accompanied by camera footage showing meteorological phenomena, including hurricanes, earthquakes, monsoons and more.

A contractor walks off the job while adding a covered front porch and entranceway to Yvonne and Tadashi's home.

Following marine salvage teams as they race against the clock to recover ships wrecked by fierce storms that rage across the globe.

Mike Holmes can fix just about everything. His motto reads: "If you're going to do something, do it right the first time." And that definitely applies to his home renovation work, which is featured in this series as he and his crew rescue homeowners victimized by shoddy contractors. Holmes is a warmhearted, straight-shooting regular guy who tells it like it is, especially when it comes to messy builders and the sloppy, lazy jobs they leave behind.

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

Mike Holmes can fix just about everything. His motto reads: "If you're going to do something, do it right the first time." And that definitely applies to his home renovation work, which is featured in this series as he and his crew rescue homeowners victimized by shoddy contractors. Holmes is a warmhearted, straight-shooting regular guy who tells it like it is, especially when it comes to messy builders and the sloppy, lazy jobs they leave behind.

Mike Holmes can fix just about everything. His motto reads: "If you're going to do something, do it right the first time." And that definitely applies to his home renovation work, which is featured in this series as he and his crew rescue homeowners victimized by shoddy contractors. Holmes is a warmhearted, straight-shooting regular guy who tells it like it is, especially when it comes to messy builders and the sloppy, lazy jobs they leave behind.

Paid programming.

Across North America and the rest of the world, hurricanes, storm surges, earthquakes and sea level rise threaten major cities and lead to natural catastrophes.

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

Pushing the boundaries of scientific innovation and engineering often results in mind-boggling building achievements. Unfortunately, progress can also produce leaning towers of terror. This series showcases the latter - engineering disasters, from the hilarious to the mind-boggling, from the deadly to the bank-busting. Episodes profile, investigate and analyze outrageous structural gaffes, then tell of genius resolutions to solve the issues. Blunders include an airport that is sinking into the sea, an upside-down bridge, and a waterfront building that creates a dangerous wind tunnel.

The team transforms a mother-of-pearl coin purse, a flamenco guitar and a 1950s London black cab taxi meter; the barn's first visitors meet with conservator Suzie Fletcher.

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

Paranormal investigators capture a shadow figure in a haunted Nevada prison; a hidebehind in Oregon gives a girl and her grandma a serious fright; a tiny elfin creature makes a toddler uneasy in Argentina.

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

A dark entity shows itself to investigators inside one of America's haunted homes; the ghost of a young girl materializes in an Illinois bar; a father and son in California film a UFO that appears to be alive.

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

Guest comic Mircea Monroe.

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.

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

A restaurant is robbed and the night manager murdered, leading police to investigate suspicious co-workers, a disgruntled ex-employee and a violent serial attacker.

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 age old question of what happens after death and the clues to the answer may lie in unusual cases of near-death experience, reincarnation, and how memories can be passed from organ donors to transplant recipients.

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

Paranormal investigators capture a shadow figure in a haunted Nevada prison; a hidebehind in Oregon gives a girl and her grandma a serious fright; a tiny elfin creature makes a toddler uneasy in Argentina.

Hitting a pop-music high note, looking at ancient Rome and facing TV trivia heartbreak.

The age old question of what happens after death and the clues to the answer may lie in unusual cases of near-death experience, reincarnation, and how memories can be passed from organ donors to transplant recipients.

A dark entity shows itself to investigators inside one of America's haunted homes; the ghost of a young girl materializes in an Illinois bar; a father and son in California film a UFO that appears to be alive.

Detectives investigate a secret affair, a kidnapping plot and a racist gang when a young husband-to-be is found shot and stabbed.

The team transforms a mother-of-pearl coin purse, a flamenco guitar and a 1950s London black cab taxi meter; the barn's first visitors meet with conservator Suzie Fletcher.

A restaurant is robbed and the night manager murdered, leading police to investigate suspicious co-workers, a disgruntled ex-employee and a violent serial attacker.

Paranormal investigators capture a shadow figure in a haunted Nevada prison; a hidebehind in Oregon gives a girl and her grandma a serious fright; a tiny elfin creature makes a toddler uneasy in Argentina.

The age old question of what happens after death and the clues to the answer may lie in unusual cases of near-death experience, reincarnation, and how memories can be passed from organ donors to transplant recipients.

Fiona Bruce and the team travel to Portchester Castle in Hampshire on the south coast of England, where treasures include a set of RAF medals awarded for extreme bravery to an airman who served in Dunkirk and the Battle of Britain.

A visit to the Ulster Folk Museum near Belfast includes a look at stained glass, teacups from a luxury ocean liner and an unusual piece of medical history.

The team transforms a mother-of-pearl coin purse, a flamenco guitar and a 1950s London black cab taxi meter; the barn's first visitors meet with conservator Suzie Fletcher.

A restaurant is robbed and the night manager murdered, leading police to investigate suspicious co-workers, a disgruntled ex-employee and a violent serial attacker.

A homeowner finds something that could put the health of their small family at risk.

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.

Fiona Bruce and the team travel to Portchester Castle in Hampshire on the south coast of England, where treasures include a set of RAF medals awarded for extreme bravery to an airman who served in Dunkirk and the Battle of Britain.

A visit to the Ulster Folk Museum near Belfast includes a look at stained glass, teacups from a luxury ocean liner and an unusual piece of medical history.

Stephen Fry messes with the mind, with Sarah Millican, Tommy Tiernan, Josh Widdicombe, and Alan Davies.

Stephen Fry makes a meal of some M-themed food topics with Cariad Lloyd, Dermot O'Leary, Phill Jupitus, and Alan Davies.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

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

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

Guest comic Mircea Monroe.

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.

Fiona Bruce and the team travel to Portchester Castle in Hampshire on the south coast of England, where treasures include a set of RAF medals awarded for extreme bravery to an airman who served in Dunkirk and the Battle of Britain.

A visit to the Ulster Folk Museum near Belfast includes a look at stained glass, teacups from a luxury ocean liner and an unusual piece of medical history.

Scramble as the staff tries to find a place for each of the orphaned skunks, raccoons, and groundhogs that are streaming through the rehab's doors. Then deal with the deadly side of spring as the team tries to save a hare wounded by a weed whacker.

Stephen Fry messes with the mind, with Sarah Millican, Tommy Tiernan, Josh Widdicombe, and Alan Davies.

Stephen Fry makes a meal of some M-themed food topics with Cariad Lloyd, Dermot O'Leary, Phill Jupitus, and Alan Davies.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

Scramble as the staff tries to find a place for each of the orphaned skunks, raccoons, and groundhogs that are streaming through the rehab's doors. Then deal with the deadly side of spring as the team tries to save a hare wounded by a weed whacker.

Hitting a pop-music high note, looking at ancient Rome and facing TV trivia heartbreak.

Fiona Bruce and the team travel to Portchester Castle in Hampshire on the south coast of England, where treasures include a set of RAF medals awarded for extreme bravery to an airman who served in Dunkirk and the Battle of Britain.

A visit to the Ulster Folk Museum near Belfast includes a look at stained glass, teacups from a luxury ocean liner and an unusual piece of medical history.

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

Proofing makes perfect as contestants mix and knead their dough into cottage loaves, cream-and-jam Devonshire splits and artfully braided centerpieces.

The remaining hopefuls try to avoid a meltdown while making tortes sans wheat flour, cheesecakes and chocolate boxes with cake and bonbons inside.

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.

Detectives investigate a secret affair, a kidnapping plot and a racist gang when a young husband-to-be is found shot and stabbed.

U.K. investigators are confronted by a dark presence in an abandoned home; Bigfoot stalking two brothers in Rochester, N.Y.; a smoke break in San Juan turns into a double UFO sighting.

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

After centuries of study, the human mind remains inscrutable; examining how the brain can be more powerful than humans realize.

A look at how some people live through the impossible such as plane crashes, freezing temperatures, or performing superhuman feats while in danger; remarkable tales of human survival force others to reconsider what is known about the will to live.

Learning that their posh neighbors have an ancient claim over their land, Mike and Alison throw a swanky dinner party to help resolve the issue; with the ghosts their only guide to high-class decorum, the evening starts badly and only gets worse.

Now juggling day jobs with their endless renovations, Mike and Alison are both penniless and exhausted when a luxury hotel chain makes them an offer they can't refuse; the ghosts vow to help the cash-strapped couple with get-rich-quick schemes.

Alison and Mike are trying to find a semi-harmonious routine with the ghostly housemates of Button House and are working towards a new money-making venture to fund their perpetual renovations.

Alison and Mike scramble to pick up the house after a long night of partying has left it a mess; the house is scheduled for a venue viewing, so the two are in a time crunch to clean; Alison investigates why the ghosts are acting so strangely.

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

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

Detectives investigate a secret affair, a kidnapping plot and a racist gang when a young husband-to-be is found shot and stabbed.

U.K. investigators are confronted by a dark presence in an abandoned home; Bigfoot stalking two brothers in Rochester, N.Y.; a smoke break in San Juan turns into a double UFO sighting.

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.

After centuries of study, the human mind remains inscrutable; examining how the brain can be more powerful than humans realize.

A look at how some people live through the impossible such as plane crashes, freezing temperatures, or performing superhuman feats while in danger; remarkable tales of human survival force others to reconsider what is known about the will to live.

On the flanks of a volcano, lava appears that astonishingly burns bright blue; a creepy orange entity pulses threateningly at the bottom of a partially frozen pond; a huge, sinister dark blob invades a popular beach.

Learning that their posh neighbors have an ancient claim over their land, Mike and Alison throw a swanky dinner party to help resolve the issue; with the ghosts their only guide to high-class decorum, the evening starts badly and only gets worse.

Now juggling day jobs with their endless renovations, Mike and Alison are both penniless and exhausted when a luxury hotel chain makes them an offer they can't refuse; the ghosts vow to help the cash-strapped couple with get-rich-quick schemes.

Alison and Mike are trying to find a semi-harmonious routine with the ghostly housemates of Button House and are working towards a new money-making venture to fund their perpetual renovations.

Alison and Mike scramble to pick up the house after a long night of partying has left it a mess; the house is scheduled for a venue viewing, so the two are in a time crunch to clean; Alison investigates why the ghosts are acting so strangely.

On the flanks of a volcano, lava appears that astonishingly burns bright blue; a creepy orange entity pulses threateningly at the bottom of a partially frozen pond; a huge, sinister dark blob invades a popular beach.

A restaurant is robbed and the night manager murdered, leading police to investigate suspicious co-workers, a disgruntled ex-employee and a violent serial attacker.

U.K. investigators are confronted by a dark presence in an abandoned home; Bigfoot stalking two brothers in Rochester, N.Y.; a smoke break in San Juan turns into a double UFO sighting.

Looking beneath the veneer of money, connections and fast cars that surrounded Tennessee couple Joe and Tina Coronna; learning how secret lovers, shady investments and threats to reveal Joe's financial sins added up to the perfect recipe for murder.

After centuries of study, the human mind remains inscrutable; examining how the brain can be more powerful than humans realize.

A look at how some people live through the impossible such as plane crashes, freezing temperatures, or performing superhuman feats while in danger; remarkable tales of human survival force others to reconsider what is known about the will to live.

Detectives investigate a secret affair, a kidnapping plot and a racist gang when a young husband-to-be is found shot and stabbed.

Renovating a cottage located on an island.

Mike Holmes helps a couple with a heat problem in their brand-new town home in an upscale suburb.

Lucia rescues a painting by an eminent Scottish artist; Hum along as Julyan makes a well-travelled Lebanese stringed instrument sing again, then restore a trailblazing pilot's historic headgear with Suzie.

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.

Detectives investigate a secret affair, a kidnapping plot and a racist gang when a young husband-to-be is found shot and stabbed.

Examining the evil acts that Jennifer Sybert, a hairdresser in Florida, tried to keep hidden from her colleague, top stylist Joleen Cummings; an entanglement with Joleen's ex blows the lid off Jennifer's criminal past, and leads to a ghastly slaying.

Frank and Lu race against time when an undertaker is given 24 hours to live by two strange hitmen.

Frank and Lu investigate when a woman dies in a magic trick gone gruesomely wrong.

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.

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.

Hitting a pop-music high note, looking at ancient Rome and facing TV trivia heartbreak.

Mike does an inspection of a flipped house.

Hitting a pop-music high note, looking at ancient Rome and facing TV trivia heartbreak.

Checking in with a ready-for-anything trio, then diving into stellar astronomical constellation facts; celebrating a lucky guess about Mediterranean islands, rolling the dice on Trivial Pursuit, and seeing a head-scratcher land a winner in hot water.

Uncovering the mystery of the Holy Grail.

Lucia rescues a painting by an eminent Scottish artist; Hum along as Julyan makes a well-travelled Lebanese stringed instrument sing again, then restore a trailblazing pilot's historic headgear with Suzie.

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

Uncovering the mystery of the Holy Grail.

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.

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

Frank and Lu race against time when an undertaker is given 24 hours to live by two strange hitmen.

Frank and Lu investigate when a woman dies in a magic trick gone gruesomely wrong.

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.

Lucia rescues a painting by an eminent Scottish artist; Hum along as Julyan makes a well-travelled Lebanese stringed instrument sing again, then restore a trailblazing pilot's historic headgear with Suzie.

Learning that their posh neighbors have an ancient claim over their land, Mike and Alison throw a swanky dinner party to help resolve the issue; with the ghosts their only guide to high-class decorum, the evening starts badly and only gets worse.

Now juggling day jobs with their endless renovations, Mike and Alison are both penniless and exhausted when a luxury hotel chain makes them an offer they can't refuse; the ghosts vow to help the cash-strapped couple with get-rich-quick schemes.

Alison and Mike are trying to find a semi-harmonious routine with the ghostly housemates of Button House and are working towards a new money-making venture to fund their perpetual renovations.

Alison and Mike scramble to pick up the house after a long night of partying has left it a mess; the house is scheduled for a venue viewing, so the two are in a time crunch to clean; Alison investigates why the ghosts are acting so strangely.

Recent video of a large, hairy creature and casts of its footprints; a man dodges rush hour traffic with seemingly superhuman reflexes; a woman escapes from her sinking vehicle without opening the doors or windows.

A girl whose reflection doesn't match her expression; whether Mars was actually colonized centuries ago; a mysterious hum heard around the world; recent video of a large, hairy creature; a man dodges rush hour traffic with incredible reflexes.

A party store in Mexico is plagued by a malicious entity; a treasure hunt is interrupted by Bigfoot in New Mexico; a mysterious green creature lurks inside a cave in Aruba.

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

A creature that tormented an Australian man's childhood is back for more; a DJ in North Carolina is still spinning sets from beyond the grave; a UFO in Islamabad remains immobile for hours.

Hitting rewind on a previous nail-biting finale; testing knowledge of Julia Roberts films; seeing what a mum of three knows about Narnia; a tennis trivia test; locking in a win on the science jackpot question.

Guest comic Mircea Monroe.

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 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.

A restaurant is robbed and the night manager murdered, leading police to investigate suspicious co-workers, a disgruntled ex-employee and a violent serial attacker.

A party store in Mexico is plagued by a malicious entity; a treasure hunt is interrupted by Bigfoot in New Mexico; a mysterious green creature lurks inside a cave in Aruba.

A creature that tormented an Australian man's childhood is back for more; a DJ in North Carolina is still spinning sets from beyond the grave; a UFO in Islamabad remains immobile for hours.

Recent video of a large, hairy creature and casts of its footprints; a man dodges rush hour traffic with seemingly superhuman reflexes; a woman escapes from her sinking vehicle without opening the doors or windows.

A girl whose reflection doesn't match her expression; whether Mars was actually colonized centuries ago; a mysterious hum heard around the world; recent video of a large, hairy creature; a man dodges rush hour traffic with incredible reflexes.

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

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, and spot an immovable waterfall in Mexico.

Many of the world's deadliest cults venture down dark, dangerous rabbit holes of twisted ideologies, with deadly dances, manipulation, mass suicides, and murder.

For more than 200 years, treasure hunters have been coming to Oak Island in search of a treasure that has so far eluded them all, and has even cost six men their lives, could it be, as legend suggests, the treasure is protected by a deadly curse.

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, and spot an immovable waterfall in Mexico.

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

A party store in Mexico is plagued by a malicious entity; a treasure hunt is interrupted by Bigfoot in New Mexico; a mysterious green creature lurks inside a cave in Aruba.

Many of the world's deadliest cults venture down dark, dangerous rabbit holes of twisted ideologies, with deadly dances, manipulation, mass suicides, and murder.

For more than 200 years, treasure hunters have been coming to Oak Island in search of a treasure that has so far eluded them all, and has even cost six men their lives, could it be, as legend suggests, the treasure is protected by a deadly curse.

A creature that tormented an Australian man's childhood is back for more; a DJ in North Carolina is still spinning sets from beyond the grave; a UFO in Islamabad remains immobile for hours.

Recent video of a large, hairy creature and casts of its footprints; a man dodges rush hour traffic with seemingly superhuman reflexes; a woman escapes from her sinking vehicle without opening the doors or windows.

A girl whose reflection doesn't match her expression; whether Mars was actually colonized centuries ago; a mysterious hum heard around the world; recent video of a large, hairy creature; a man dodges rush hour traffic with incredible reflexes.

Many of the world's deadliest cults venture down dark, dangerous rabbit holes of twisted ideologies, with deadly dances, manipulation, mass suicides, and murder.

For more than 200 years, treasure hunters have been coming to Oak Island in search of a treasure that has so far eluded them all, and has even cost six men their lives, could it be, as legend suggests, the treasure is protected by a deadly curse.

Frank and Lu race against time when an undertaker is given 24 hours to live by two strange hitmen.

Frank and Lu investigate when a woman dies in a magic trick gone gruesomely wrong.

Host Tony Harris separates the real from the fake in some of the top UFOs caught on camera in recent history.

Asking if aliens could be human time travelers from the future or if a trick shot could classify a person as superhuman; someone may have found the lost Malaysian Airlines Flight 370 hiding in the jungle.

Investigating mysterious lights under the surface of the deepest lake on Earth; Bigfoot's call and chatter; exploring the possibility of sentient UFOs.

Stephen Fry messes with the mind, with Sarah Millican, Tommy Tiernan, Josh Widdicombe, and Alan Davies.

Stephen Fry makes a meal of some M-themed food topics with Cariad Lloyd, Dermot O'Leary, Phill Jupitus, and Alan Davies.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

Learning that their posh neighbors have an ancient claim over their land, Mike and Alison throw a swanky dinner party to help resolve the issue; with the ghosts their only guide to high-class decorum, the evening starts badly and only gets worse.

Now juggling day jobs with their endless renovations, Mike and Alison are both penniless and exhausted when a luxury hotel chain makes them an offer they can't refuse; the ghosts vow to help the cash-strapped couple with get-rich-quick schemes.

Alison and Mike are trying to find a semi-harmonious routine with the ghostly housemates of Button House and are working towards a new money-making venture to fund their perpetual renovations.

Alison and Mike scramble to pick up the house after a long night of partying has left it a mess; the house is scheduled for a venue viewing, so the two are in a time crunch to clean; Alison investigates why the ghosts are acting so strangely.

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

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

Frank and Lu race against time when an undertaker is given 24 hours to live by two strange hitmen.

Frank and Lu investigate when a woman dies in a magic trick gone gruesomely wrong.

Host Tony Harris separates the real from the fake in some of the top UFOs caught on camera in recent history.

Asking if aliens could be human time travelers from the future or if a trick shot could classify a person as superhuman; someone may have found the lost Malaysian Airlines Flight 370 hiding in the jungle.

Investigating mysterious lights under the surface of the deepest lake on Earth; Bigfoot's call and chatter; exploring the possibility of sentient UFOs.

Fiona Bruce and the team travel to Portchester Castle in Hampshire on the south coast of England, where treasures include a set of RAF medals awarded for extreme bravery to an airman who served in Dunkirk and the Battle of Britain.

A visit to the Ulster Folk Museum near Belfast includes a look at stained glass, teacups from a luxury ocean liner and an unusual piece of medical history.

Learning that their posh neighbors have an ancient claim over their land, Mike and Alison throw a swanky dinner party to help resolve the issue; with the ghosts their only guide to high-class decorum, the evening starts badly and only gets worse.

Now juggling day jobs with their endless renovations, Mike and Alison are both penniless and exhausted when a luxury hotel chain makes them an offer they can't refuse; the ghosts vow to help the cash-strapped couple with get-rich-quick schemes.

Alison and Mike are trying to find a semi-harmonious routine with the ghostly housemates of Button House and are working towards a new money-making venture to fund their perpetual renovations.

Alison and Mike scramble to pick up the house after a long night of partying has left it a mess; the house is scheduled for a venue viewing, so the two are in a time crunch to clean; Alison investigates why the ghosts are acting so strangely.

Host Tony Harris separates the real from the fake in some of the top UFOs caught on camera in recent history.

Asking if aliens could be human time travelers from the future or if a trick shot could classify a person as superhuman; someone may have found the lost Malaysian Airlines Flight 370 hiding in the jungle.

Investigating mysterious lights under the surface of the deepest lake on Earth; Bigfoot's call and chatter; exploring the possibility of sentient UFOs.

Sandi looks at multiple organisms with Nish Kumar, Holly Walsh and Cariad Lloyd.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

Sandi Toksvigs welcomes guests Bill Bailey, Jan Ravens, Grayson Perry and Alan Davies onto the show to take a look at over and ova.

Sandi Toksvig considers all things odorous and odious, including the world's second-smelliest man, with Sally Phillips, Ross Noble, Nish Kumar and Alan Davies.

Hitting rewind on a previous nail-biting finale; testing knowledge of Julia Roberts films; seeing what a mum of three knows about Narnia; a tennis trivia test; locking in a win on the science jackpot question.

Checking in with a ready-for-anything trio, then diving into stellar astronomical constellation facts; celebrating a lucky guess about Mediterranean islands, rolling the dice on Trivial Pursuit, and seeing a head-scratcher land a winner in hot water.

Guest comic Mircea Monroe.

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.

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

Checking in with a ready-for-anything trio, then diving into stellar astronomical constellation facts; celebrating a lucky guess about Mediterranean islands, rolling the dice on Trivial Pursuit, and seeing a head-scratcher land a winner in hot water.

Hitting rewind on a previous nail-biting finale; testing knowledge of Julia Roberts films; seeing what a mum of three knows about Narnia; a tennis trivia test; locking in a win on the science jackpot question.

Frank and Lu race against time when an undertaker is given 24 hours to live by two strange hitmen.

Frank and Lu investigate when a woman dies in a magic trick gone gruesomely wrong.

Sandi looks at multiple organisms with Nish Kumar, Holly Walsh and Cariad Lloyd.

A quiz which compensates for the level of difficulty by awarding points not just for correct answers but also for interesting answers, regardless of their relevance to the original question asked.

Sandi Toksvigs welcomes guests Bill Bailey, Jan Ravens, Grayson Perry and Alan Davies onto the show to take a look at over and ova.

Proofing makes perfect as contestants mix and knead their dough into cottage loaves, cream-and-jam Devonshire splits and artfully braided centerpieces.

The remaining hopefuls try to avoid a meltdown while making tortes sans wheat flour, cheesecakes and chocolate boxes with cake and bonbons inside.

Hitting rewind on a previous nail-biting finale; testing knowledge of Julia Roberts films; seeing what a mum of three knows about Narnia; a tennis trivia test; locking in a win on the science jackpot question.

Hitting a pop-music high note, looking at ancient Rome and facing TV trivia heartbreak.

Jennifer teams up with cryptozoologist Andrew Sanford to investigate newly surfaced evidence of Bigfoot.

Proofing makes perfect as contestants mix and knead their dough into cottage loaves, cream-and-jam Devonshire splits and artfully braided centerpieces.

Sandi Toksvigs welcomes guests Bill Bailey, Jan Ravens, Grayson Perry and Alan Davies onto the show to take a look at over and ova.

Jennifer teams up with cryptozoologist Andrew Sanford to investigate newly surfaced evidence of Bigfoot.

Sign off.

Checking in with a ready-for-anything trio, then diving into stellar astronomical constellation facts; celebrating a lucky guess about Mediterranean islands, rolling the dice on Trivial Pursuit, and seeing a head-scratcher land a winner in hot water.

Sandi looks at multiple organisms with Nish Kumar, Holly Walsh and Cariad Lloyd.

Host Sandi Toksvig takes an unconventional look at the oceans and a publisher makes a suggestion to improve "Moby Dick"; guests include Joe Lycett, Alan Davies, Aisling Bea and David Mitchell.

Sandi Toksvig considers all things odorous and odious, including the world's second-smelliest man, with Sally Phillips, Ross Noble, Nish Kumar and Alan Davies.

When tiles begin to crack after a renovation the contractor finds a dangerous surprise.

Hitting rewind on a previous nail-biting finale; testing knowledge of Julia Roberts films; seeing what a mum of three knows about Narnia; a tennis trivia test; locking in a win on the science jackpot question.

Checking in with a ready-for-anything trio, then diving into stellar astronomical constellation facts; celebrating a lucky guess about Mediterranean islands, rolling the dice on Trivial Pursuit, and seeing a head-scratcher land a winner in hot water.

Personal stories of those caught up in sometimes deadly natural catastrophes, accompanied by camera footage showing meteorological phenomena, including hurricanes, earthquakes, monsoons and more.

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.

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.

Homeowners who are drowning in their own possessions receive Mike's help.

The crew returns to Ham House in Richmond, where jewelry specialist John Benjamin is amazed to find a necklace and bracelet in a bag of compost; Mark Hill is intrigued by a chessboard designed by filmmaker Derek Jarman.

With all the secrets, lies, greed, and infidelity, Ernie and Charlene Scherer's American-dream life was not exactly what it seemed like; a look into how the exposure of their dangerous double life led to one last fatal gamble.

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

Dean gets to work on a set of baby booties an immigrant brought to England as a reminder of home; Lucia revamps a faded Italian heirloom; David restores a wooden mat.

A Michigan toddler plays a spirited game of tug of war with a ghost; a paranormal enthusiast in England captures a shadow figure lurking at the foot of his bed; a massive lake monster surfaces in China.

An unknown entity continues to torment a New Jersey family; a strange specter spies on a paranormal investigator at an abandoned train station in Sweden; a woman captures a mysterious dark mass hovering in the skies above Houston.

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.

When a devoted mother is stabbed to death in a horrifying attack, suspicion falls on those closest to her; a cryptic note and a violent crime spree baffle detectives at first, but they eventually track down a deranged killer no one predicted.

A dog that can detect cancer faster than doctors can do it by using sophisticated equipment; a horse that can read minds; birds that can sense disaster days before it happens.

A Michigan toddler plays a spirited game of tug of war with a ghost; a paranormal enthusiast in England captures a shadow figure lurking at the foot of his bed; a massive lake monster surfaces in China.

Unraveling the intricate details of high-profile accidents, from structural collapses to technological failures using cutting-edge 3D animation and CGI to get inside the disaster and identify what went wrong, how and when..

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 dog that can detect cancer faster than doctors can do it by using sophisticated equipment; a horse that can read minds; birds that can sense disaster days before it happens.

Unraveling the intricate details of high-profile accidents, from structural collapses to technological failures using cutting-edge 3D animation and CGI to get inside the disaster and identify what went wrong, how and when..

An unknown entity continues to torment a New Jersey family; a strange specter spies on a paranormal investigator at an abandoned train station in Sweden; a woman captures a mysterious dark mass hovering in the skies above Houston.

A vibrant young mother of three is murdered in the safety of her own home and investigators look to a history of troubled romances, but when the case goes cold and police can't find the killer, a phone call leads to a culprit hiding in plain sight.

Dean gets to work on a set of baby booties an immigrant brought to England as a reminder of home; Lucia revamps a faded Italian heirloom; David restores a wooden mat.

When a devoted mother is stabbed to death in a horrifying attack, suspicion falls on those closest to her; a cryptic note and a violent crime spree baffle detectives at first, but they eventually track down a deranged killer no one predicted.

A Michigan toddler plays a spirited game of tug of war with a ghost; a paranormal enthusiast in England captures a shadow figure lurking at the foot of his bed; a massive lake monster surfaces in China.

A dog that can detect cancer faster than doctors can do it by using sophisticated equipment; a horse that can read minds; birds that can sense disaster days before it happens.

The team visits Woodhorn Museum in Northumberland; they come across a gold Rolex from the 1980s and FA Cup medals that were won by a Newcastle United legend.

The crew returns to Ham House in Richmond, where jewelry specialist John Benjamin is amazed to find a necklace and bracelet in a bag of compost; Mark Hill is intrigued by a chessboard designed by filmmaker Derek Jarman.

Dean gets to work on a set of baby booties an immigrant brought to England as a reminder of home; Lucia revamps a faded Italian heirloom; David restores a wooden mat.

When a devoted mother is stabbed to death in a horrifying attack, suspicion falls on those closest to her; a cryptic note and a violent crime spree baffle detectives at first, but they eventually track down a deranged killer no one predicted.

The inspector missed something important when inspecting the fireplaces.

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.

The team visits Woodhorn Museum in Northumberland; they come across a gold Rolex from the 1980s and FA Cup medals that were won by a Newcastle United legend.

The crew returns to Ham House in Richmond, where jewelry specialist John Benjamin is amazed to find a necklace and bracelet in a bag of compost; Mark Hill is intrigued by a chessboard designed by filmmaker Derek Jarman.

Sandi Toksvig considers various odds and ends with Romesh Ranganathan, Matt Lucas, Liza Tarbuck and Alan Davies.

Sara Pascoe, Colin Lane and Jimmy Carr join regular Alan Davies and host Sandi Toksvig for a look at opposites, including how to sort sheep from goats and the opposite of Tarzan.

Host Sandi Toksvig looks at operations with guests Bill Bailey, Katherine Ryan, Rhod Gilbert and Alan Davies.

Jason Manford, Romesh Ranganathan, Holly Walsh and Alan Davies learn the best way to wrap an awkwardly shaped present and get wine stains out of a carpet.

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.

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.

The team visits Woodhorn Museum in Northumberland; they come across a gold Rolex from the 1980s and FA Cup medals that were won by a Newcastle United legend.

The crew returns to Ham House in Richmond, where jewelry specialist John Benjamin is amazed to find a necklace and bracelet in a bag of compost; Mark Hill is intrigued by a chessboard designed by filmmaker Derek Jarman.