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...Win Every War. America: Al faces up to the richest nation on Earth to discover how the former British colony of America somehow slipped through its fingers.

In 1966, two Ohio police officers spot a strange light in the sky, triggering a chase across state lines. An ex-military man in Florida is knocked out by a beam of light in 1965. (S2, ep 3)

In 1977, Amazonian village locals have a frightening encounter when a UFO shoots beams of light at them. An Australian farmer sees a strange object descend from the sky in 1963. (S2, ep 4)

Weeping Cave: The families reach the halfway point on their epic journey across the seven cities of gold, as the treasure hunt for the infamous lost gold of the Aztecs rolls on. (4 of 8)

A Journey to the Not So Far East: When a professor provides Peter and Elroy with new information, they realise they must expand their investigation to the East Coast. (S2, ep 3)

Galloglass - Warlords of Ireland: These Norse-Gaelic clans settled in medieval Ireland and battled Norman invaders. Artefacts and bones from the era shed light on the Galloglass. (S3, ep 4)

Chachapoya, Celts, Carthage: Discover mummies from an ancient civilisation and visit the Tophet of Carthage. Was this simply a children's cemetery or a place of sacrifice? (S1, ep 4)

A Scottish Killing: Homicide detective Rod Demery and scientist Professor Turi King study an 800-year-old partial skeleton. Can they identify the killer? (S1, ep 4)

The Princes in the Tower: Royal Blood: Richard III, whose body was recently exhumed, is linked to the deaths of two princes in the Tower of London in 1483. (S1, ep 5)

The Rapture: When millions over the world vanish, a biblical prophecy known as the Rapture will be fulfilled. Are there signs of the prediction actually happening? (S1, ep 8)

The Pagan: A divided Roman Empire is rocked by devastating earthquakes, fires, barbarian invasions and religious divides. Meanwhile, as Rome declines, the Colosseum lies empty. (S1, ep 8)

Top Ten Alien Craft: Count down the top ten alien craft, from V-shaped objects to orbs of light to flying saucers. (S15, ep 14)

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2)

Chachapoya, Celts, Carthage: Discover mummies from an ancient civilisation and visit the Tophet of Carthage. Was this simply a children's cemetery or a place of sacrifice? (S1, ep 4)

Battle of Hastings: Exploring the impact of the Battle of Hastings in 1066, Karl and Kevin continue their look at how weapons and body armour developed. (S1, ep 3)

...Win Every War. The Romans: Bruno Tonioli joins Al to look at key battle tactics during the Roman Invasion back in AD 43.

The Vikings: Comedian John Thomson and historian Janina Ramirez join Al to explore the truth about Vikings and how they were so successful in Britain.

The Constellation Code: Experts check out structures built to mirror the constellations. Could they have been built as a message to extraterrestrials? (S12, ep 13)

The Star Gods of Sirius: 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)

Deadly Sounds From Above: From ghostly voices to vanishing UFOs, experts investigate puzzling and mysterious signal interferences and break down the meanings behind them. (S1, ep 1)

A Journey to the Not So Far East: When a professor provides Peter and Elroy with new information, they realise they must expand their investigation to the East Coast. (S2, ep 3)

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 Top Ten Alien Petroglyphs: Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts. (S15, ep 15)

The Prototypes: Through history, mankind has credited its existence to otherworldly beings. Could this be true? Can any proof be found in these early beliefs? (S9, ep 3)

Queen Boudicca's Revolt: Revisiting the bloody British uprising against the Romans, presenter Karl Ude-Martinez tests out swords, spears and armour. (S1, ep 5)

The Vikings: Comedian John Thomson and historian Janina Ramirez join Al to explore the truth about Vikings and how they were so successful in Britain.

In 1968, airmen in North Dakota spot a huge UFO over one of the US' most high security Air Force bases. Papua New Guinea village locals report strange objects in the sky in 1959. (S2, ep 5)

In 2000, two brothers spot a UFO the size of six football fields after a hunting in Idaho. A Madagascan city is plunged into darkness when a metal craft hovers overhead in 1954. (S2, ep 6)

A Grave Discovery: The Villescas family talk with an expert about a spur they found. Meanwhile, the Dillmans use drones to locate an important ancient symbol. (5 of 8)

Flip the Coin: Peter and Elroy get to see the famous Maine Penny and meet anthropologist Harald Prins. (S2, ep 4)

American Cheese: James Kraft sniffs out an opportunity with a new cheese innovation that rivals the Pabst brothers' more traditional offering. (S2, ep 4)

Stone Age Technology: Dr Alice Roberts uncovers some incredible finds from North Britain, including Scottish man-made islands that help paint a picture of Stone Age tech. (S5, ep 2)

The Lost Aztec Colony: Journey hundreds of feet below the streets of major cities from New York to Tokyo as season four explores the layered remnants of civilisations.

Texan farm workers are confronted by a 200-foot long object in the sky in 1957. In 1979, a UFO releases spiked spheres that leave a man unconscious in Scotland. (S2, ep 7)

In Brazil, three men escape a close encounter. In Canada, a thirteen-year-old boy is blinded temporally after investigating a bizarre object. (S2, ep 8)

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

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

The Top Ten Alien Petroglyphs: Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts. (S15, ep 15)

The Prototypes: Through history, mankind has credited its existence to otherworldly beings. Could this be true? Can any proof be found in these early beliefs? (S9, ep 3)

Stone Age Technology: Dr Alice Roberts uncovers some incredible finds from North Britain, including Scottish man-made islands that help paint a picture of Stone Age tech. (S5, ep 2)

The Great War - the Somme: Presenter Karl Ude-Martinez takes a tour of the weapons used during the Battle of the Somme in 1916, including machine guns and poison gas. (S1, ep 4)

...Win Every War. America: Al faces up to the richest nation on Earth to discover how the former British colony of America somehow slipped through its fingers.

...Win Every War. Scotland vs England: Al is joined by Sanjeev Kohli as they visit Craufurdland Castle to explore the truth behind famous battles from the Wars of Scottish Independence.

Angels And Aliens: 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)

Unexplained Structures: Could aliens have helped humans build huge ancient structures? Experts ask whether standing stones in France, were a GPS system for ancient spacecraft. (S2, ep 9)

The Constellation Code: Experts check out structures built to mirror the constellations. Could they have been built as a message to extraterrestrials? (S12, ep 13)

The Great War - the Somme: Presenter Karl Ude-Martinez takes a tour of the weapons used during the Battle of the Somme in 1916, including machine guns and poison gas. (S1, ep 4)

Weapons For All: Weapons designed for everyone hand a sizeable advantage. Experts explore three weapons that are easily used: the crossbow, a pike and the Kalashnikov. (S1, ep 4)

Islands of Fire: Could Hawaii's islands have once been inhabited by extraterrestrials? Experts investigate whether its volcanoes provide a portal between space and time. (S12, ep 12)

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 Deadly Weapons: From gunpowder to missiles, were these lethal weapons the product of human innovation or created with help from another, otherworldly source? (S3, ep 9)

Aliens And The Creation Of Man: Can unexplained advances in human evolution be attributed to alien architects? Alien theorists look at the evidence. (S1, ep 8)

East: Alice Roberts and Matt Williams present more outstanding archaeology. The team unearths a mass grave and search the Thames for clues to a 17th century tragedy. (S4, ep 2)

WWII and King Arthur: Dr Alice Roberts explores finds from the west of Britain, including the lost World War I training trenches on Salisbury Plain. (S5, ep 1)

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 16)

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 18)

The Bulge: Rewind to the US Army's largest and bloodiest conflict of World War II: The Battle of the Bulge. Venture through the battle in newly colourised footage. (S1, ep 5)

Overloaded: Clues from other disasters are examined to determine what caused the I-35 bridge in Minneapolis to collapse without warning at the peak of rush hour traffic. (1 of 6)

The 1715 Treasure Fleet: Rick, Marty and Matty join Gary Drayton to hunt for millions in gold, silver and jewels from the shipwrecks of the famed 1715 Spanish treasure fleet. (S2, ep 1)

Mary I: Bloody Mary: Professor Alice Roberts explores the death of the infamous Bloody Mary, who experienced phantom pregnancies in her desperation for a child and heir. (S2, ep 2)

Film detailing how the Stormtroopers, which originated in the First World War, were again used successfully in WWII by the Generals of the Wehrmacht in the Lightning War.