The series investigates satellite images of what seems to be a giant face carved into the earth in Alberta. Could this have extraterrestrial origins? (S12, ep 2).

Physicist Bob Lazar says he was hired to reverse-engineer an alien spacecraft by the US government, with a fuel source that had the power to change the world. (S12, ep 3).

Alice tells the story of Roman Britain by studying the history of Chester. She enjoys an authentic Roman feast and checks out an archaeological discovery. (1 of 6).

Alice looks into the history of York, taking part in a Viking battle and examining an almost 1,000-year-old poo. (2 of 6).

Explore the history of the Presidency. Here, look at a question every U.S. President has faced: who is included in this soaring phrase? (5 of 6).

Explore the history of the Presidency. Here, trace the rise of America's place on the world stage. Season finale. (6 of 6).

The story of Cleopatra Selene, the little-known daughter of Cleopatra and Antony, who witnessed her dynasty collapse but survived to become a great queen. (S1, ep 3).

Hearing about his great-grandfather who served in the Merchant Navy inspires Ross to explore the wreck of a WWII cargo ship and try to recover its military supplies. (S1, ep 4).

Dr Alice Roberts explores a secret location in the Cotswolds, which gives up a very precious and fragile artefact. (1 of 4).

The team hunt for artefacts from World War II. (4 of 4).

William Shatner continues his quest to find answers to the unexplainable, this week turning his attention to the apocalypse. (S3, ep 4).

William Shatner is back on the hunt to find answers to the unexplainable, this week turning his attention to immortals. (S3, ep 5).

Explore how, despite repeated denials, the significance of UFO sightings could have been analysed and discussed at the highest levels of government. (S1, ep 6).

Tony investigates ruins found at the Bermuda Triangle before analysing evidence of similar discoveries from around the world and passing verdict. (S1, ep 1).

Three places, three spooky stories. Experts examine weird sightings and unsolved disappearances at Bennington, Bermuda and Bridgewater triangles. (S1, ep 4).

Hans Kammler's fingerprints can be found all over the Third Reich's most prestigious and deadly engineering projects, including rockets and concentration camps. (S1, ep 4).

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).

Amanda learns the customs of a true society girl, while Dan makes his own animal intestine condom and discovers how many brothels existed in London at the time. (S1, ep 3).

Over the past 20 years, thousands of potentially habitable exoplanets have been found. Could they be home to intelligent extraterrestrial life? (S12, ep 22).

Giorgio A Tsoukalos and David Childress explore the mysterious chain of man-made islets in Micronesia's Nan Madol. Could local legends be true? (S12, ep 23).

We examine how the battleship began the 20th century as a dominant force, but then saw its weaknesses exploited mercilessly in the World Wars. (S1, ep 1).

War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2).

In 1947, the US military collected debris of what they claimed was a crashed weather balloon outside Roswell, New Mexico. But was there more to it? (S12, ep 25).

UFO witnesses have reported a variety of objects in Earth's skies for centuries - could they offer clues about more intelligent life in our galaxy? (S12, ep 32).

Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

Alice tells the story of Roman Britain by studying the history of Chester. She enjoys an authentic Roman feast and checks out an archaeological discovery. (1 of 6).

Explore the history of the Presidency. Here, look at a question every U.S. President has faced: who is included in this soaring phrase? (5 of 6).

In the wake of the First World War, Adolf Hitler identifies Benito Mussolini as his model and has one ultimate goal: to gain power in Germany. (S1, ep 1).

Series examining 75 million years of alien evidence on Earth. Discover what secrets extraterrestrials may have left behind and how spacemen might have shaped our world. (S2, ep 1).

Could a curse really exist on Tutankhamun's tomb, but in the form of alien technology designed to protect an incredible secret about our past? (S10, ep 4).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (3 of 6).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 6).

Explore the history of the Presidency. Here, trace the rise of America's place on the world stage. Season finale. (6 of 6).

From India at the time of the Mughal Empire to the Assyrian city of Nineveh, uncover the origins of the curses surrounding the Koh-i-Noor, the Neo-Assyrian Stele and more. (S1, ep 6).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 1).

Alice Roberts tours the East of England, seeking out the biggest archaeological digs of the year and witnessing the uncovering of a hugely significant Roman mosaic. (S9, ep 1).

Alice reveals the history of Belfast, the UK's most Victorian city. She visits the shipyards that built the Titanic and gets locked up in the Crumlin Road gaol. (6 of 6).

Taylor unearths new testimony from a witness to Slumach's execution and a deathbed letter sends Adam and Kru on a dangerous glacial trek. (S1, ep 1).

Dive deep into the ancient cultures of the Vikings, the Incan Empire and Tel Banat to reveal how their people treated their dead. (S1, ep 3).

Professor Alice Roberts strives to get to the bottom of Elizabeth I's death, using research, medical expertise and dramatic recreation to determine possible reasons. (S1, ep 2).

Series examining 75 million years of alien evidence on Earth. Discover what secrets extraterrestrials may have left behind and how spacemen might have shaped our world. (S2, ep 1).

Could a curse really exist on Tutankhamun's tomb, but in the form of alien technology designed to protect an incredible secret about our past? (S10, ep 4).

Alice Roberts tours the East of England, seeking out the biggest archaeological digs of the year and witnessing the uncovering of a hugely significant Roman mosaic. (S9, ep 1).

The troubled beginnings and amazing exploits of the legendary British heavy bomber. Plus, see a replica up close. (1 of 6).

A look at the later, clipped wing version flown by Czech refugee pilots in the UK during World War II. Plus, a tour of a restored example. (2 of 6).

What would happen if a UFO did land on Earth and humans found it? Engineers create a 'spaceship' to see how alien technology could work. (S1, ep 14).

Chile has the highest number of UFO sightings of anywhere on Earth. Now, incredible footage of a strange craft has people asking again about the reasons why. (S12, ep 26).

Experts investigate whether rocket scientist Wernher von Braun might have found inspiration in technology found at the alleged UFO crash in Roswell. (S8, ep 3).

Alice looks into the history of York, taking part in a Viking battle and examining an almost 1,000-year-old poo. (2 of 6).

Explore the history of the Presidency. Here, trace the rise of America's place on the world stage. Season finale. (6 of 6).

Hitler appears to be eliminated after his failed putsch in 1923. Discover how the Nazi movement used democracy's tolerance in Germany to come back. (S1, ep 2).

Why do many cultures tell similar tales of monsters and giants? Could they be eye-witness accounts of extraterrestrials? Series exploring evidence of aliens. (S2, ep 2).

Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm. (S10, ep 5).

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

War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2).

Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 7).

As Baghdad fell to US forces in 2003,15,000 priceless antiquities were stolen. Learn about the efforts to catch the culprits. (S1, ep 1).

From Nazi Germany to mid-west America during the cretaceous period, uncover the origins of the curses surrounding the Gurlitt Collection, Stan the T-Rex and more. (S1, ep 7).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 2).

The south of England offers rich pickings, including the earliest money made in Britain and a massive haul of Roman treasure. (S9, ep 2).

As series two kicks off, Professor Alice Roberts examines Britain in wartime by looking at the coastal town of Dover.

Investigating how a skull changed neuroscience and asking if World War II could have been won by a bat. (S2, ep 2).

What can preserved swords from the Battle of Castillon in 1453 tell us about the Hundred Years' War? (S3, ep 3).

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored. (S3, ep 2).

Why do many cultures tell similar tales of monsters and giants? Could they be eye-witness accounts of extraterrestrials? Series exploring evidence of aliens. (S2, ep 2).

Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm. (S10, ep 5).

The south of England offers rich pickings, including the earliest money made in Britain and a massive haul of Roman treasure. (S9, ep 2).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (3 of 6).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

Laser weapons and tele-transporters would probably all be fitted to an alien spaceship, but what if they could be used by humans too? (S1, ep 15).

What is it about the number 12? It holds divine significance in numerous sacred traditions and it's found repeatedly in ancient architecture. But why? (S12, ep 35).

Series examining 75 million years of alien evidence on Earth. Discover what secrets extraterrestrials may have left behind and how spacemen might have shaped our world. (S2, ep 1).

Alice tries some eel pie and investigates the origins of modern surgery as she explores the Norman period of British history by examining the town of Winchester. (3 of 6).

The disappearance of a powerful union activist from a Detroit suburb remains one of the most notorious missing person cases of all time. (S3, ep 1).

A protest turns into a racist and anti-Jewish movement during the 1920s and the NSDAP use emotions to gain the loyalty of the people. (S1, ep 3).

From Mexico's mystifying Zone of Silence, to Markawasi Plateau in Peru, known for its frequent UFO sightings, were these the homes of ancient aliens? (S2, ep 3).

The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there? (S10, ep 6).

Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew. (S1, ep 1).

Explore the complex case of the death of Wladyslaw Sikorski, the Polish PM whose plane crashed soon after taking off in 1943. (S1, ep 2).

Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing recent UFO encounters. (S1, ep 8).

Rewind and learn about how Western collectors turned a blind eye to ISIS selling Syria's precious ancient past. (S1, ep 2).

From revolutionary Russia to ancient Egypt, uncover the origins of the curses surrounding the Fabergé Eggs, the Unlucky Mummy and more. (S1, ep 8).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 3).

Discover the most incredible archaeology from the north of Britain, including Scotland's oldest railway and one of the best-preserved Norman castles. (S9, ep 3).

Alice Roberts explores the Georgian era in her hometown of Bristol, from architectural gems and the world's first chocolate factory to the horror of the slave trade.

Built in 537, this is a walk-through the stunning place of worship located in Istanbul, Turkey.

Mercy or Murder?: In 1936, George V's death was hastened by his physician - but what were his motives? And did he also euthanise the King's sister? (S1, ep 6).

The prophecies of Nostradamus, from the French Revolution to the rise of Adolf Hitler, have long piqued interest - and according to him, the world will end in 3797. (S1, ep 12).

From Mexico's mystifying Zone of Silence, to Markawasi Plateau in Peru, known for its frequent UFO sightings, were these the homes of ancient aliens? (S2, ep 3).

The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there? (S10, ep 6).

Discover the most incredible archaeology from the north of Britain, including Scotland's oldest railway and one of the best-preserved Norman castles. (S9, ep 3).

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

War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2).

HG Wells' classic tale of a Martian invasion has terrified audiences for more than 100 years. The history of its many retellings is revealed. (S1, ep 8).

According to the earliest Tibetan traditions, hidden in the Himalaya Mountains is Shambhala, a kingdom of the gods. Does this mystical realm truly exist? (S12, ep 36).

A look at the accounts of modern-day alien abductees. Plus, could the bizarre Paracas skulls discovered by Julio Tello be of extraterrestrial origin? (S8, ep 5).

A look at the accounts of modern-day alien abductees. Plus, could the bizarre Paracas skulls discovered by Julio Tello be of extraterrestrial origin? (S8, ep 5).

Alice experiences humiliating Tudor justice as she dives into the story of Tudor England by studying the history of Norwich. (4 of 6).

Cyanide-tainted Tylenol capsules links the victims of a series of unexplained deaths in the 80s together. To this day, what happened is a mystery. (S3, ep 12).

President Hindenburg suspends freedom of speech and Hitler comes to power in 1933. The first concentration camps for political opponents are set up. (S1, ep 4).

Could aliens have told Joan of Arc how to beat the English army? And could a US serviceman have received a message when he touched a spaceship? (S2, ep 4).

Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

A look at the creation of the super marine Spitfire, an amazing feat of engineering that became one of the most famous fighter aircrafts in the Battle of Britain.

In 2012, Italian divers discovered the wreck of the biggest aircraft in WWII, Messerschmidt Gigant, off the coast of Sardinia. This film explores the search for the wreckage.

Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 9).

A fragment of papyrus worth more than its weight in gold appears at auction, spelling the end for a superstar Oxford don. (S1, ep 3).

From a hidden tomb in Turkey to a death bed in Norway, uncover the origins of the curses surrounding the Karun Treasure, Edvard Munch's The Sick Child paintings and more. (S1, ep 9).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 4).

Alice Roberts heads to the Midlands to take a look at the best archaeological finds from the heart of England. (S9, ep 4).

Alice tells the story of Edwardian Britain by studying the history of Cardiff, Britain's most Edwardian town. (3 of 6).

Examine how the strategy of encirclement devised by Hannibal left 50,000 Romans dead on the battlefield of Apulia on August 2, 216 BC. (S1, ep 2).

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).

An icon of history, Alexander the Great helped crush the Persian Empire, carry Macedonian arms to India and much more. Explore his legacy in this two-part documentary. (2 of 2).

Could aliens have told Joan of Arc how to beat the English army? And could a US serviceman have received a message when he touched a spaceship? (S2, ep 4).

Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

Alice Roberts heads to the Midlands to take a look at the best archaeological finds from the heart of England. (S9, ep 4).

Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew. (S1, ep 1).

Explore the complex case of the death of Wladyslaw Sikorski, the Polish PM whose plane crashed soon after taking off in 1943. (S1, ep 2).

In 1977, a remote Brazilian island was visited nightly by strange flying objects, leaving people with bizarre puncture marks and blood loss. What happened? (S1, ep 10).

In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world. (S12, ep 30).

Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Alice studies the history of Cheltenham, Britain's most Regency town. She attends a period society ball, investigates the rigid social hierarchy and more. (5 of 6).

Explore the mystery that spawned a 75-year quest for an incomparable work of art worth half a billion dollars, lost without a trace. (S1, ep 3).

In 1934, Hitler's government is firmly in the saddle. Most Germans support Hitler's anti-Jewish policy and the regime's terror soon escalates. (S1, ep 5).

Investigation into whether advanced technologies such as lasers and sonic weapons are merely rediscovered tools used by advanced beings in the past. (S2, ep 6).

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

The Luftwaffe's Frontline Fighter: The astonishing story of the 109 and its modified variants, best known for its role in the Battle of Britain. (3 of 6).

Superfortress: The story of the prolonged development and the initially troubled operational history of the Boeing B29 Superfortress. (4 of 6).

Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 10).

A discovery at Memphis International Airport shakes the foundations of one of the US' wealthiest families. (S1, ep 4).

From the Austro-Hungarian Empire to Britain in the early Middle Ages, uncover the origins of the curses surrounding Franz Ferdinand's car, Lindow Man and more. (S1, ep 10).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 5).

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town. (S9, ep 5).

Alice explores the English Civil War through the history of Oxford, the city at the heart of a battle between an autocratic king and his rebellious parliament. (4 of 6).

60 years on, Tony's close encounter has become an obsession. Meanwhile, pilot David presents photographic evidence of the UFO he almost crashed into whilst flying near area 51. (S1, ep 1).

Homicide detective Rod Demery and forensic scientist Turi King investigate a century-old dismembered body, found in a cave, and deduce who may have killed him. (S1, ep 3).

Umberto 'Albert' Anastasia, once the chief of the notorious 'Murder Incorporated' crime firm, winds up the target of a mob hit in a barber shop chair. (S1, ep 4).

Investigation into whether advanced technologies such as lasers and sonic weapons are merely rediscovered tools used by advanced beings in the past. (S2, ep 6).

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town. (S9, ep 5).

A look at the creation of the super marine Spitfire, an amazing feat of engineering that became one of the most famous fighter aircrafts in the Battle of Britain.

In 2012, Italian divers discovered the wreck of the biggest aircraft in WWII, Messerschmidt Gigant, off the coast of Sardinia. This film explores the search for the wreckage.

In 1938, hundreds of mysterious stone disks were found in a cave in China. Are these proof of contact with an alien race? (S1, ep 3).

Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S6, ep 10).

Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11).

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).

While the single shot rifle remained a mainstay until WWI, machine guns had been in development since the final days of the American Civil War. (2 of 3).

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).

Journey back to 480 BC, when King Leonidas and his 300 Spartans successfully blocked Xerxes' two-million-strong Persian army at Thermopylae. (S1, ep 3).

In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world. (S12, ep 30).

Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso. (S1, ep 4).

Alice Roberts tours the East of England, seeking out the biggest archaeological digs of the year and witnessing the uncovering of a hugely significant Roman mosaic. (S9, ep 1).

Discover the most incredible archaeology from the north of Britain, including Scotland's oldest railway and one of the best-preserved Norman castles. (S9, ep 3).

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51. (S5, ep 5).

Learn about the hunting of Jack the Ripper from space, the battle of the big guns in the land of the Bible, the clash of the mega-beasts, and a visitation from another galaxy. (S5, ep 6).

Churchill must make crucial decisions and figure out how to navigate big changes as the war rages on and Britain makes a powerful ally. (3 of 4).

When a DC-10 aeroplane explodes mid-flight over Iowa, the quick-thinking pilot saves 184 passengers. But what caused such a huge disaster? (5 of 6).

The Laginas and Matty Blake assist a team of treasure hunters in Utah as they hunt for billons in gold at a site believed to be the Lost Josephine Mine. (S2, ep 5).

Professor Alice Roberts strives to get to the bottom of Elizabeth I's death, using research, medical expertise and dramatic recreation to determine possible reasons. (S1, ep 2).

Hermann Goering was the commander-in-chief of the Luftwaffe and Hitler's designated successor. This is his dark story. (S1, ep 5).

The career of Albert Speer, Hitler's architect, is explored in this documentary of dark figures. (S1, ep 6).

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

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).

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

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).

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).

Experts investigate whether aliens from a tiny star visited humans in the past, and left behind a clue that still remains in our language. (S12, ep 4).

From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5).

When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6).

As series two kicks off, Professor Alice Roberts examines Britain in wartime by looking at the coastal town of Dover.

Alice Roberts explores the Georgian era in her hometown of Bristol, from architectural gems and the world's first chocolate factory to the horror of the slave trade.

A look at the creation of the super marine Spitfire, an amazing feat of engineering that became one of the most famous fighter aircrafts in the Battle of Britain.

In 2012, Italian divers discovered the wreck of the biggest aircraft in WWII, Messerschmidt Gigant, off the coast of Sardinia. This film explores the search for the wreckage.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored. (S3, ep 2).

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town. (S9, ep 5).

The south of England offers rich pickings, including the earliest money made in Britain and a massive haul of Roman treasure. (S9, ep 2).

Alice Roberts heads to the Midlands to take a look at the best archaeological finds from the heart of England. (S9, ep 4).

William Shatner is back on the hunt to find answers to the unexplainable, this week focussing on the red planet, Mars. (S3, ep 7).

Series host William Shatner is back on the hunt to find answers to the unexplainable with the help of top scientists. (S3, ep 8).

60 years on, Tony's close encounter has become an obsession. Meanwhile, pilot David presents photographic evidence of the UFO he almost crashed into whilst flying near area 51. (S1, ep 1).

The team investigate the strange underwater anomalies in the Bermuda Triangle and analyse evidence of similar discoveries around the world. (S1, ep 2).

What did UFO chaser Captain Mantell see before he was killed? Plus, experts investigate a close encounter in Texas and a mysterious crash at Shag Harbour. (S1, ep 5).

The designer of one of the most popular car brands in history, Ferdinand Porsche would not have seen his success without the support of Adolf Hitler. (S1, ep 5).

Taylor unearths new testimony from a witness to Slumach's execution and a deathbed letter sends Adam and Kru on a dangerous glacial trek. (S1, ep 1).

Amanda Holden and Dan Jones explore the Victorian era, one of the most sexually progressive societies in history, to learn more about the Queen's dirty secrets. (S1, ep 4).

An exploration of the possibility that The Book of Enoch was stricken from the Bible because it documents humanity's extraterrestrial origins. (S12, ep 37).

From Egypt to Easter Island, towering figures built by ancient man stand watch over Earth. But do they depict visitors from another world? (S12, ep 27).

From tests in the River Thames, to the German's deadly U-boat attacks in World War II, this episode explores the silent threat of submarines. (S1, ep 5).

Exploring the Cold War vessels that played pivotal roles in events such as the blockade of Cuba and the Vietnam war. (S1, ep 6).

New evidence reveals advanced civilisations might have existed on Earth thousands of years ago - is it possible that they lived with extraterrestrials? (S12, ep 28).

Accounts of creatures that can shapeshift from one form to another can be found throughout history. But are they real and do they have otherworldly origins? (S12, ep 31).

Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7).

Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7).

Alice reveals the history of Belfast, the UK's most Victorian city. She visits the shipyards that built the Titanic and gets locked up in the Crumlin Road gaol. (6 of 6).

As the Cold War ramps up, a body is found within miles of a nuclear testing site on a tranquil Australian beach. (S1, ep 4).

At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered. (S1, ep 6).

From a cave in Ecuador said to hold tablets containing alien knowledge, to an underground city in Turkey, explore supposed extraterrestrial lairs. (S2, ep 7).

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record. (S10, ep 9).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6).

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (6 of 6).

What would happen if a UFO did land on Earth and humans found it? Engineers create a 'spaceship' to see how alien technology could work. (S1, ep 14).

The curator of the J Paul Getty Museum's collection falls into disgrace, brought down by a jet-setting dealer. (S1, ep 5).

Lindisfarne was a peaceful, holy island, until the Vikings arrived. Tim Sutherland joins archaeologists as they uncover the realities of the Viking raid. (S1, ep 1).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 6).

Another visit to the north for Alice, checking out evidence of early writing by the Picts in Scotland and a 3,000-year-old Bronze Age coffin. (S9, ep 6).

Alice studies the history of Canterbury, learning the true horror of the Black Death and exploring the iconic cathedral. (5 of 6).

An indigenous woman's testimony claims to know where Slumach found his gold. After returning from the expedition empty-handed, a vision has Kru rattled. (S1, ep 2).

What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

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).

From a cave in Ecuador said to hold tablets containing alien knowledge, to an underground city in Turkey, explore supposed extraterrestrial lairs. (S2, ep 7).

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record. (S10, ep 9).

Another visit to the north for Alice, checking out evidence of early writing by the Picts in Scotland and a 3,000-year-old Bronze Age coffin. (S9, ep 6).

The Luftwaffe's Frontline Fighter: The astonishing story of the 109 and its modified variants, best known for its role in the Battle of Britain. (3 of 6).

Superfortress: The story of the prolonged development and the initially troubled operational history of the Boeing B29 Superfortress. (4 of 6).

In December 1980, Air Force personnel witnessed strange lights hovering above the English countryside. Did they have a close encounter with alien spacecraft? (S1, ep 11).

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents? (S12, ep 33).

Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity? (S8, ep 8).

As series two kicks off, Professor Alice Roberts examines Britain in wartime by looking at the coastal town of Dover.

A media storm explodes when the infant son of an aviation legend is kidnapped and sparks a nationwide manhunt. (S3, ep 11).

In the shadow of the war, the Nazi regime gradually advances its.

Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist? (S2, ep 8).

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

Ships don't have to be large to make history, like the 1776 gunboat built to stop a British invasion, or the remarkable story of the HA-19 sub. (S1, ep 8).

A look at the tactics employed to pass strategically important ships under the nose of the enemy, and the use of intelligence to carry out naval attacks. (S1, ep 10).

Laser weapons and tele-transporters would probably all be fitted to an alien spaceship, but what if they could be used by humans too? (S1, ep 15).

In December 2021, a hedge-fund billionaire and collector is forced to turn over $70 million worth of stolen loot. (S1, ep 6).

In 2009, a mass grave was discovered in Dorset. Can the skeletons reveal any details about how these Vikings met their gruesome end? (S1, ep 2).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 7).

Can a site on the Lancashire-Yorkshire border shed more light on the Pendle Witch trials of 1612? (S1, ep 1).

Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of 6).

Exploring the origin of a death mask, three carvings which could shed light on Stonehenge and a plate found in Austria. (S2, ep 3).

The team examines skulls from the site of the 1499 Battle of Dornach, which saw Switzerland win its independence from the Holy Roman Empire. (S3, ep 5).