Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13).

The Assassination of RFK: Five years after John F Kennedy is killed by gunshot, his brother Robert meets the same fate - and the clues are riddled with inconsistencies. (S5, ep 13).

The Ambush: Experts explore how the ambush has revolutionised warfare with the benefit of undetected weapons, from the caltrop to the insidious land mine. (S1, ep 8).

Learn about Nazis and cannibals in the Black Forest, Russia's tectonic terror weapon and Jungle guerrillas on the warpath. (S5, ep 10).

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12).

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13).

Salisbury: It's the River Avon for Rick and Beau's final stop of the series, where they stumble upon some Roman coins in their search for William the Conqueror's legacy. (S1, ep 8).

England's Last Battle - West Country: Tony arrives at the most rebellious corner of England as he looks back at the Duke of Monmouth's attempt to overthrow the British monarchy. (S3, ep 6).

Odysseus - Curse Of The Sea: Homer's The Odyssey is the most famous epic ever written - a story of a 20-year journey to return home from war. But could it actually have happened? (S1, ep 6).

The Ambush: Experts explore how the ambush has revolutionised warfare with the benefit of undetected weapons, from the caltrop to the insidious land mine. (S1, ep 8).

Mutant Mermaid, UFOs vs Nukes and Seamonster Chases a Boat: Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities? (S3, ep 19).

Find the billion-dollar horde buried deep beneath the deserts of Utah, discover the massacre so horrific it was captured from space and see the ice cave of the Norse fire God. (S5, ep 16).

Cops vs UFOs: Hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated UFO encounters. (S1, ep 1).

Nixon: Maisie Adam, Desiree Burch and Miles Jupp decide whether Nixon was actually, in fact, a crook. (S1, ep 5).

Fugitives: The plot to blow up the Houses of Parliament has failed - and while mercenary Guido Fawkes is taken to the Tower of London, his accomplices are on the run. (1 of 3).

The Assassination of RFK: Five years after John F Kennedy is killed by gunshot, his brother Robert meets the same fate - and the clues are riddled with inconsistencies. (S5, ep 13).

El Alamein: Through newly colourised footage, enter the heart of the War of the Mediterranean as the fate of North Africa was contested during the battle of El Alamein. (S1, ep 3).

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12).

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13).

Salisbury: It's the River Avon for Rick and Beau's final stop of the series, where they stumble upon some Roman coins in their search for William the Conqueror's legacy. (S1, ep 8).

Somerset: Andy searches for dragons in Somerset, visits the grave of Arthur and Guinevere and tests the healing waters of a spring once used to wash the Holy Grail. (S1, ep 5).

Cops vs UFOs: Hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated UFO encounters. (S1, ep 1).

Mutant Mermaid, UFOs vs Nukes and Seamonster Chases a Boat: Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities? (S3, ep 19).

Tesla Experiment: Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14).

Alien Encounters: Ancient Astronaut Theorists investigate how ancient aliens may have helped to guide and define mankind in the remote past. (S6, ep 15).

The Salem Witch Trials: A tragedy leads to one of the darkest chapters in early American history, as fear rips through the small town of Salem, Massachusetts. (S5, ep 14).

Deadly Inventions: A team of experts tests the deadliest weapons upgrades across the history of warfare, including the Scorpio, the long sword and Henry's rifle. (S1, ep 9).

Discover terrifying new images of a blob swallowing a city, spy ships attacking America, skydiving cannibal spiders and the radioactive killer fly factory. (S5, ep 11).

Tesla Experiment: Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14).

Alien Encounters: Ancient Astronaut Theorists investigate how ancient aliens may have helped to guide and define mankind in the remote past. (S6, ep 15).

The Battle of Killiecrankie: The team find evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands. (S2, ep 1).

Scotland: The Search for the Loch Ness Monster: Andy joins a team of Nessie experts to carry out the biggest search for the Loch Ness Monster in 50 years. (S1, ep 1).

Odysseus - Warrior's Revenge: Continue the story of Odysseus, a timeless tale of adventure filled with mythological beasts and vengeful gods. But could it actually have happened? (S1, ep 7).

Deadly Inventions: A team of experts tests the deadliest weapons upgrades across the history of warfare, including the Scorpio, the long sword and Henry's rifle. (S1, ep 9).

Alien Sabotage, Ghost Child and Hungry Hungry Sasquatch: Strange creatures are encountered and a home security video may be proof that UFOs are messing with technology. (S3, ep 20).

Decode the mysterious Arizona desert cypher, discover the lair of the war elephant and beware the zombie village. (S5, ep 17).

USOs: The team use high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon. (S1, ep 2).

Building a Super Power: Witness the truth behind the Ancient Egyptian superpower we know today as experts dive into the history of their iconic monuments and strong leaders. (S2, ep 1).

Sinister Spy Weapons: An exploration into the dark art of spy-craft reveals the deadliest weapons deployed to gather information and assassinate enemies. (S1, ep 7).

The Salem Witch Trials: A tragedy leads to one of the darkest chapters in early American history, as fear rips through the small town of Salem, Massachusetts. (S5, ep 14).

The Rebirth of Rome: In a shocking turn of events dating to 337 AD, Emperor Constantine realigns his faith to Christianity renouncing thousands of years of Roman worship. (8 of 8).

Tesla Experiment: Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14).

Alien Encounters: Ancient Astronaut Theorists investigate how ancient aliens may have helped to guide and define mankind in the remote past. (S6, ep 15).

The Battle of Killiecrankie: The team find evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands. (S2, ep 1).

Wiltshire: Andy explores Wiltshire's mysterious megaliths and barrows, visits a medieval meadery and encounters a religious pilgrimage at the site of a freshly made crop circle. (S1, ep 6).

USOs: The team use high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon. (S1, ep 2).

Alien Sabotage, Ghost Child and Hungry Hungry Sasquatch: Strange creatures are encountered and a home security video may be proof that UFOs are messing with technology. (S3, ep 20).

The God Particle: Experts question what the God Particle reveals about the origin of our world and whether clues to its significance could have been left by ancient aliens. (S6, ep 16).

Mysteries Of The Sphinx: Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being. (S7, ep 1).

The Lost Fortune of the Knights Templar: Discover what happened to the secret hoard of the Knights Templar - containing gold, silver and relics protected by a religious order. (S5, ep 15).

Civilians on the Battlefield: A team of experts explore the weapons used to recklessly attack civilian populations, from the brutal trebuchet to the devastating atomic bomb. (S1, ep 10).

Look inside America's top-secret apocalypse pyramid, explore China's hidden terror camps and see Iran's hidden terror-crater. (S5, ep 12).

The God Particle: Experts question what the God Particle reveals about the origin of our world and whether clues to its significance could have been left by ancient aliens. (S6, ep 16).

Mysteries Of The Sphinx: Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being. (S7, ep 1).

Viking Invasion: Rick and Beau embark on an epic search through the River Ouse in Yorkshire, in a bid to find evidence of Viking life. (S2, ep 2).

Cornwall Part One: Andy embarks on a mission to unearth the Cornish sites of King Arthur, before magnet fishing for Excalibur and visiting the grave of a legendary witch. (S1, ep 2).

Hades: Discover the myth of ancient Greece's most feared god. Hades takes us behind the veil of the ancient Greek belief in life after death with chilling tales. (S1, ep 2).

Civilians on the Battlefield: A team of experts explore the weapons used to recklessly attack civilian populations, from the brutal trebuchet to the devastating atomic bomb. (S1, ep 10).

The Bigfoot Files: Tony Harris separates the real from the fake in some of the most compelling Bigfoot evidence recently captured, including huge primate-like footprints. (S4, ep 1).

Witness unexplained shapes in the deserts of Genghis Khan, see the mystery fleet of ice planes at the end of the Earth and look down at Kim Jong Un's terror factory from space. (S5, ep 18).

Reverse Engineering: Has the US military derived various forms of technology, including stealth technology, from downed UFOs? The UFO Magazine team investigate. (S1, ep 3).

Holy Relics: Throughout history and across the globe, there have been many sacred relics believed to hold mystical powers - but is it really possible? (S3, ep 39).

Tales of the Dearly Departed: For over 100,000 years, humans have laid the dead to rest. But is it possible for some practises to preserve the soul for eternity? (S3, ep 31).

The Lost Fortune of the Knights Templar: Discover what happened to the secret hoard of the Knights Templar - containing gold, silver and relics protected by a religious order. (S5, ep 15).

Elevator from Hell, Pediatric Predator, the Visitor: A security guard witnesses two ghosts, a nurse faces a spirit in an old hospital, and long-slumbering ghosts suddenly awaken. (S1, ep 5).

The God Particle: Experts question what the God Particle reveals about the origin of our world and whether clues to its significance could have been left by ancient aliens. (S6, ep 16).

Mysteries Of The Sphinx: Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being. (S7, ep 1).

Viking Invasion: Rick and Beau embark on an epic search through the River Ouse in Yorkshire, in a bid to find evidence of Viking life. (S2, ep 2).

Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7).

Reverse Engineering: Has the US military derived various forms of technology, including stealth technology, from downed UFOs? The UFO Magazine team investigate. (S1, ep 3).

The Bigfoot Files: Tony Harris separates the real from the fake in some of the most compelling Bigfoot evidence recently captured, including huge primate-like footprints. (S4, ep 1).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Aliens and the Old West: Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897. (S3, ep 1).

The Vessels That Saved D-Day: A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible. (S1, ep 3).

Ambulance Trains: From the trench to the home front hospital, a medical historian retraces the train journey made by wounded soldiers during World War I. (S1, ep 3).

Vehicles That Liberated Europe: The story of one American GI and how he and his Harley motorbike became a legend. (S1, ep 3).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Uncover an atomic tomb, witness multi-million dollar wacky races and discover the country on fire. (S5, ep 15).

The story of Hitler and his penchant for barbarism and destruction, starting with his surprise Russian invasion and the anarchy that followed. (1 of 2).

Making a Killing - Douglas Latchford and the Cambodian Killing Fields: Douglas Latchford was the go-to expert in Khmer antiquities. But an investigation sees his world crumble. (S1, ep 7).

Crypt Of Civilisation: Explore the fate of crypts, safes, time capsules, personal records and other human relics. Meanwhile, Marine Corps learn to succeed in the wild. (S2, ep 3).

Waves Of Devastation: A massive force of water threatens to destroy everything, from famous paintings to whole cities. The fate of the Sydney Opera House looks bleak. (S2, ep 5).

Romeo & Juliet: When Samantha Lopez and Ronald McIntosh develop a romantic connection, they hatch an ambitious escape plan that utilises Ron's experience as a helicopter pilot. (S1, ep 1).

Mysterious Sacred Structures: The history and perplexing mysteries behind some of the world's most sacred and holy relics. (S1, ep 7).

Mystifying Cursed Objects: Ancient cultures around the world have aroused fascination and provoked fear with curses and objects used to conjure them. (S1, ep 8).

Suicidal Maidens: This episode delves into Hitler's controlling sexual nature. The four women pursued by him, including his niece, only saw one way out of the relationship - death. (4 of 4).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Aliens and the Old West: Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897. (S3, ep 1).

The Rebirth of Rome: In a shocking turn of events dating to 337 AD, Emperor Constantine realigns his faith to Christianity renouncing thousands of years of Roman worship. (8 of 8).

Holy Relics: Throughout history and across the globe, there have been many sacred relics believed to hold mystical powers - but is it really possible? (S3, ep 39).

Inside the Tower of London: A look at an extraordinary display of nearly 900,000 ceramic poppies in the moat. Also, Curator Bridget explores a reminder of the horrors of war. (S1, ep 3).

Liza Tarbuck on Weather: Liza Tarbuck tackles the national obsession with all things weather-related. Season finale. (S1, ep 6).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

Aliens And Monsters: Experts explore a Hindu scripture describing a huge flying creature that landed on Earth. Could this monster have been an alien craft from outer space? (S3, ep 2).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Mysterious Sacred Structures: The history and perplexing mysteries behind some of the world's most sacred and holy relics. (S1, ep 7).

Mystifying Cursed Objects: Ancient cultures around the world have aroused fascination and provoked fear with curses and objects used to conjure them. (S1, ep 8).

Part Two: The World War II killings carried out by the Nazis on Alderney represent the worst mass murder in British history - yet no one has been brought to justice. (2 of 2).

Find the billion-dollar horde buried deep beneath the deserts of Utah, discover the massacre so horrific it was captured from space and see the ice cave of the Norse fire God. (S5, ep 16).

Decode the mysterious Arizona desert cypher, discover the lair of the war elephant and beware the zombie village. (S5, ep 17).

Witness unexplained shapes in the deserts of Genghis Khan, see the mystery fleet of ice planes at the end of the Earth and look down at Kim Jong Un's terror factory from space. (S5, ep 18).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

Aliens And Monsters: Experts explore a Hindu scripture describing a huge flying creature that landed on Earth. Could this monster have been an alien craft from outer space? (S3, ep 2).

The First Metal Warships: Looking at early metal warships, and how HMS Rattler's screw propeller in 1845 would lead to the revolutionary HMS Dreadnought in the 20th Century. (S1, ep 4).

The First Railroad War: The story of the Great Locomotive Chase - an attempt by Northern spies to steal steam locomotive The General during the American Civil War. (S1, ep 4).

Bombs, Bridges and Tunnels: We examine the robot that defused bombs both on foreign battlefields and British streets, and an astonishing Gulf War minelayer. (S1, ep 4).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Leased to the Devil, Maternity Ward Menace: A woman tries to banish a shadow from her office. A man claims he has experienced poltergeists and the spirit of a dead doctor. (S1, ep 7).

Campus Haunting, Touched by a Demon: When a family move to an old house on a hospital campus, each member experiences the inexplicable. Events escalate until they must flee. (S1, ep 8).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

Aliens And Monsters: Experts explore a Hindu scripture describing a huge flying creature that landed on Earth. Could this monster have been an alien craft from outer space? (S3, ep 2).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

The Answers: Drawing on evidence old and new, Philip Mantle casts his verdict on one of the greatest mysteries of all time. Are we alone? (4 of 4).

Tales of the Dearly Departed: For over 100,000 years, humans have laid the dead to rest. But is it possible for some practises to preserve the soul for eternity? (S3, ep 31).

Raven Master Chris must introduce a new bird to the Tower's enclosure, while Constable Nicholas is in charge of the room where Guy Fawkes was interrogated. (S1, ep 4).

The Loch Ness Monster: Despite centuries of sightings, the most infamous deep-sea monster remains unidentified. Does the Loch Ness Monster exist and, if so, what could it be? (S4, ep 1).

Alien Resurrections: Ancient alien theorists delve into the incredible stories of people who claim they mingled with celestial beings while they were on the brink of death. (S7, ep 2).

Forbidden Caves: Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate. (S7, ep 3).

The Loch Ness Monster: Despite centuries of sightings, the most infamous deep-sea monster remains unidentified. Does the Loch Ness Monster exist and, if so, what could it be? (S4, ep 1).

Call To Duty: The story of the World War II aircraft carrier USS Enterprise. Join her as she sets sail in the Pacific on a mission to sink enemy submarines. (S1, ep 1).

Discover the desert ghost town of untold riches and unspeakable horrors, the lost empire of South America and hear mystery noises that haunt a city. (S5, ep 13).

Alien Resurrections: Ancient alien theorists delve into the incredible stories of people who claim they mingled with celestial beings while they were on the brink of death. (S7, ep 2).

Forbidden Caves: Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate. (S7, ep 3).

Scotland and the Civil War: The River Hunters head to the River Lochy in search for evidence of the clashing Scottish clans embroiled in the 17th Century civil war. (S2, ep 3).

Cornwall Part Two: Andy is back in Cornwall searching for legends, meeting a real-life mermaid and fishing for Cornwall's infamous sea serpent Morgawr. (S1, ep 3).

Zeus: Ancient Greece's most powerful god wages an epic struggle against his father for control of the universe. It's the ultimate clash in what is mythology's greatest showdown. (S1, ep 10).

Call To Duty: The story of the World War II aircraft carrier USS Enterprise. Join her as she sets sail in the Pacific on a mission to sink enemy submarines. (S1, ep 1).

UFO Over the Andes, the Ohio Grassman, and Ancient Horn Mystery: Did a Chilean family photograph a real UFO over the Andes? And does a huge fossil point to a prehistoric figure? (S4, ep 2).

Discover the link between Nazis in New Mexico and a mystery craft in Roswell, explore Australia's underground labyrinthine abyss and decode the cypher of Atomic Island. (S5, ep 19).

Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4).

The Texas Seven: In 2000, with well-planned ploys, seven prisoners escaped a Texas unit using strength, wit, disguises and plenty of teamwork. (S1, ep 2).

Son of Nostradamus: In 1994, a secret manuscript hidden in the Vatican revealed a previously unknown apocalyptic prophecy accredited to Nostradamus. Where did it come from? (S1, ep 11).

The Loch Ness Monster: Despite centuries of sightings, the most infamous deep-sea monster remains unidentified. Does the Loch Ness Monster exist and, if so, what could it be? (S4, ep 1).

George IV: The Party King: Professor Alice Roberts dives into the facts surrounding the death of King George IV, looking to shed startling new light on his final few days. (S2, ep 1).

Alien Resurrections: Ancient alien theorists delve into the incredible stories of people who claim they mingled with celestial beings while they were on the brink of death. (S7, ep 2).

Forbidden Caves: Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate. (S7, ep 3).

Scotland and the Civil War: The River Hunters head to the River Lochy in search for evidence of the clashing Scottish clans embroiled in the 17th Century civil war. (S2, ep 3).

Suffolk: Andy makes a startling discovery at the site of the Rendlesham UFO incident, before sending psychic Simi to investigate one of Britain's most haunted inns. (S1, ep 8).

Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4).

UFO Over the Andes, the Ohio Grassman, and Ancient Horn Mystery: Did a Chilean family photograph a real UFO over the Andes? And does a huge fossil point to a prehistoric figure? (S4, ep 2).

Aliens Among Us: Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers. (S7, ep 4).

The Genius Factor: History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5).

Who is the Zodiac Killer?: In 1969, an unidentified killer taunted investigators with cryptic ciphers. Explore six theories that could help solve this 50-year-old mystery. (S4, ep 2).

Vengeance At Midway: Amazing CGI graphics tell the story of how the USS Enterprise and sister carriers Yorktown and Hornet turned the tide of the Pacific battle during WWII. (S1, ep 2).

Uncover an atomic tomb, witness multi-million dollar wacky races and discover the country on fire. (S5, ep 15).

Aliens Among Us: Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers. (S7, ep 4).

The Genius Factor: History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5).

Canterbury Murder: The River Hunters head to Canterbury, where they're granted special permission to undertake the first official search of this section of the River Stour. (S2, ep 4).

Devon: Andy explores an ancient cavern, takes a tour of Dartmoor's prison museum and uncovers the legend behind Arthur Conan Doyle's 'The Hound of the Baskervilles'. (S1, ep 4).

Tolkien's Monsters: Enter JRR Tolkien's fantastical world of hobbits, orcs and wizards, and uncover the real-life influences that shaped his epic fantasy books. (S1, ep 9).

Vengeance At Midway: Amazing CGI graphics tell the story of how the USS Enterprise and sister carriers Yorktown and Hornet turned the tide of the Pacific battle during WWII. (S1, ep 2).

Men in Black Calls, Old Kentucky Aliens, and Mysterious Eclipse: What is the identity of a bizarre creature spotted on a driveway? And did the Men in Black threaten a man? (S4, ep 3).

Check out America's 1500 feet tall atomic tower, uncover the lost village of the damned and embark on a hunt for dinosaur fossils. from outer space? (S5, ep 20).

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5).

The Holy Sepulchre of Jerusalem: Uncover the secrets of the Holy Sepulchre, the sacred Christian site built in the same spot as the death and resurrection of Jesus. (S3, ep 1).

Notre Dame of Paris: One of the world's most popular cathedrals, Notre Dame suffered a devastating fire in 2019 - but how is it surviving today? (S3, ep 2).

Who is the Zodiac Killer?: In 1969, an unidentified killer taunted investigators with cryptic ciphers. Explore six theories that could help solve this 50-year-old mystery. (S4, ep 2).

Singing Sands & Saudi Howling Cave: Strange sounds emanating from sand dunes in the Mongolian desert are investigated, while the ruins of a lost Roman city may have been found. (S1, ep 6).

Aliens Among Us: Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers. (S7, ep 4).

The Genius Factor: History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5).

Canterbury Murder: The River Hunters head to Canterbury, where they're granted special permission to undertake the first official search of this section of the River Stour. (S2, ep 4).

Wales: Andy tracks down the site of the original Stonehenge, meets a childhood witness of Wales' most famous UFO incident and takes part in a comedic hunt for the Welsh Wildman. (S1, ep 9).

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5).

Men in Black Calls, Old Kentucky Aliens, and Mysterious Eclipse: What is the identity of a bizarre creature spotted on a driveway? And did the Men in Black threaten a man? (S4, ep 3).

Secrets Of The Mummies: Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth? (S7, ep 6).

Alien Messages: Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7).

The Assassination of JFK: In 1963, President John F Kennedy is assassinated. A suspect is captured but investigators and amateur sleuths still investigate alternative theories. (S4, ep 3).

Jaws Of The Enemy: The American Navy is on the offensive and the first strike is on the Solomon Islands. Join the USS Enterprise as it supports the first American invasion. (S1, ep 3).

Find the billion-dollar horde buried deep beneath the deserts of Utah, discover the massacre so horrific it was captured from space and see the ice cave of the Norse fire God. (S5, ep 16).

Secrets Of The Mummies: Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth? (S7, ep 6).

Alien Messages: Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7).

The Colchester Siege: The River Hunters hit the oldest town in Britain, searching the town's historic waterway for evidence of the Siege of Colchester. (S2, ep 5).

Somerset: Andy searches for dragons in Somerset, visits the grave of Arthur and Guinevere and tests the healing waters of a spring once used to wash the Holy Grail. (S1, ep 5).

Dawn of the Celts: A journey to some of the mysteries of how the early Celts emerged and expanded, from collapsed salt mines, to bizarre rituals and lost cities. (1 of 3).

Jaws Of The Enemy: The American Navy is on the offensive and the first strike is on the Solomon Islands. Join the USS Enterprise as it supports the first American invasion. (S1, ep 3).

Orb & Crash Debris, KGB UFOs and Aliens, and Superhuman reflexes: Is the strange silver orb in the sky a UFO? And is an infamous spy organisation's footage of aliens real? (S4, ep 4).

Monsters of Diamond Desert: Satellites capture unusual images including markings in the desert, while a strange symbol could be a portal into a lost South American civilisation. (S6, ep 2).

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6).

Wat Tyler's Rebellion: After the Black Death, the lower class demand better wages - but England's involvements in the Hundred Year War has left the treasury empty. (S1, ep 1).

Betrayed: Thomas Wintour hears there has been an explosion at Holbeche House and rushes back to find a scene of devastation, with many of the men defecting. (2 of 3).

The Assassination of JFK: In 1963, President John F Kennedy is assassinated. A suspect is captured but investigators and amateur sleuths still investigate alternative theories. (S4, ep 3).

Kursk: Hitler's plan for European domination led his new generation of tanks to the Soviet town of Kursk in July 1943. Witness extraordinary colourised footage of the battle. (S1, ep 4).

Secrets Of The Mummies: Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth? (S7, ep 6).

Alien Messages: Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7).

The Colchester Siege: The River Hunters hit the oldest town in Britain, searching the town's historic waterway for evidence of the Siege of Colchester. (S2, ep 5).

Dorset: Andy heads to the home of palaeontology on the Jurassic Coast and braves the collapsing cliffs of Lyme Regis to bring back one of its many fossils. (S1, ep 10).

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6).

Orb & Crash Debris, KGB UFOs and Aliens, and Superhuman reflexes: Is the strange silver orb in the sky a UFO? And is an infamous spy organisation's footage of aliens real? (S4, ep 4).

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

The Lost Colony of Roanoke: In 1587, settlers land on Roanoke Island to establish the first English colony in America, but vanish without a trace and leave only cryptic clues. (S4, ep 4).

Bloody Santa Cruz: Follow a battle for survival in a terrible day of vicious WWII combat, when the USS Enterprise lost many of her crew and her sister ship, the USS Hornet. (S1, ep 4).

Decode the mysterious Arizona desert cypher, discover the lair of the war elephant and beware the zombie village. (S5, ep 17).

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

Knaresborough Castle: The final hunt of the series takes the team back to Yorkshire to uncover relics from the brutal 14th Century clashes between the English and Scottish. (S2, ep 6).

Wiltshire: Andy explores Wiltshire's mysterious megaliths and barrows, visits a medieval meadery and encounters a religious pilgrimage at the site of a freshly made crop circle. (S1, ep 6).

The Art and War: After thriving for three centuries, the Celts turned from traders into proven warriors, weapon masters and metal artists in a time that became their golden age. (2 of 3).

Bloody Santa Cruz: Follow a battle for survival in a terrible day of vicious WWII combat, when the USS Enterprise lost many of her crew and her sister ship, the USS Hornet. (S1, ep 4).

Beastly Howls, Holloman Air Force Base UFO, and the Cabin That Defies Gravity: How does a cabin seemingly defy gravity? And what is the origin of some frightening howls? (S4, ep 5).

North Korea Death Star: Satellites capture startling images of a structure in North Korea that may be sinister evidence of a looming nuclear threat. (S6, ep 3).

Invasion Texas 2008: The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky. (S1, ep 7).

Death & the Afterlife: Explore the Ancient Egyptians' obsession with death and the afterlife by using cutting-edge new science to expose secret artefacts and rituals. (S2, ep 2).

Bloodsports: Explore the origins of history's deadliest games, from Roman bloodsports to Russian roulette. (S1, ep 8).

The Lost Colony of Roanoke: In 1587, settlers land on Roanoke Island to establish the first English colony in America, but vanish without a trace and leave only cryptic clues. (S4, ep 4).

Ruins: Archaeologists examine new evidence uncovered in Turkey that may reveal more about the notorious tale of the Trojans.

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

Knaresborough Castle: The final hunt of the series takes the team back to Yorkshire to uncover relics from the brutal 14th Century clashes between the English and Scottish. (S2, ep 6).

Scotland: Andy travels to Scotland, visiting the heart-rending doggy suicide bridge and learning about a terrifying family of cannibals who used to prey upon weary travellers. (S1, ep 11).

Invasion Texas 2008: The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky. (S1, ep 7).

Beastly Howls, Holloman Air Force Base UFO, and the Cabin That Defies Gravity: How does a cabin seemingly defy gravity? And what is the origin of some frightening howls? (S4, ep 5).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

The Phoenix Lights Phenomenon: Delve into the popular theories behind the Phoenix Lights phenomena, a series of widely sighted UFOs observed in Arizona and Nevada back in 1997. (S4, ep 5).

Enterprise Vs Japan: The USS Enterprise is the only battle-ready American carrier in the Pacific. For her crew, the war has never been more personal when the Japanese attack. (S1, ep 5).

Witness unexplained shapes in the deserts of Genghis Khan, see the mystery fleet of ice planes at the end of the Earth and look down at Kim Jong Un's terror factory from space. (S5, ep 18).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Battle of Culloden: Rick and Beau return to tackle new rivers in a brand-new series. From Wales to Scotland, the pair investigate the cold and murky waters of historic sites. (1 of 3).

Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7).

Skyfall: Exploring why the Celts moved from prosperous cities into smaller fortified settlements and how this triggered their decline in Central Europe. (3 of 3).

Enterprise Vs Japan: The USS Enterprise is the only battle-ready American carrier in the Pacific. For her crew, the war has never been more personal when the Japanese attack. (S1, ep 5).

Mystery Bird Monster, Ancient Alien Satellite and Behemoth of the Sea Bottom: Explore a strange creature caught on camera and a sound so loud it covered the Equatorial Pacific. (S4, ep 6).

Aliens of the Infinity War: Are unusual patterns in an English field really an alien message? And why is there a secret military facility in the Nevada desert? (S6, ep 4).

UFO Dogfights: The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO. (S1, ep 8).

Alien Encounters: A cow is mutilated, a man is repeatedly abducted from his bed, and an astronomer's telescope intercepts a mysterious message. (S2, ep 1).

Life After Death: Scientists in England conduct groundbreaking séances, while someone returns from the grave. (S2, ep 2).

The Phoenix Lights Phenomenon: Delve into the popular theories behind the Phoenix Lights phenomena, a series of widely sighted UFOs observed in Arizona and Nevada back in 1997. (S4, ep 5).