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Emperors Kings And Pharoahs: Could ancient rulers have had otherworldly links? Experts examine whether history's most powerful leaders were 'chosen' and guided by aliens. (S5, ep 8)

The Omagh Bombing: Survivors, victims' relatives and former detectives reflect on the Real IRA car bomb that killed 29 people in Omagh, Northern Ireland in 1998. (S3, ep 2)

The Lost Continent (Atlantis): Atlantis, the legendary continent that sank. As the Nazis rose to power, Himmler and the SS were convinced Atlantis existed. Season premiere. (S1, ep 1)

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)

Five Bronze Age bodies found in a Kent pit. One old woman is posed pointing at something. The team investigates what and why. (S1, ep 1)

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)

The Storming of Area 51: When millions responded to a call to storm Area 51, the US military vowed deadly force. Are they hiding the truth about extraterrestrials on Earth? (S12, ep 20)

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

Investigation into Jeremy Bamber's murder of his family in Essex in 1985. Sentenced for life, he still maintains he is innocent. Is the right person behind bars? (S2, ep 4)

Viking Longships: The story of one of the world's most effective war machines: The Viking longship. They were elegant, versatile and feared. (S2, ep 1)

The Lancaster - Britain's Frontline Bomber: The troubled beginnings and amazing exploits of the legendary British heavy bomber. Plus, see a replica up close. (1 of 6)

The Storming of Area 51: When millions responded to a call to storm Area 51, the US military vowed deadly force. Are they hiding the truth about extraterrestrials on Earth? (S12, ep 20)

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

North: Alice Roberts and Matt Williams visit the Neolithic Orkney World Heritage Site, where they explore finds from archaeological digs across the north of Britain. (S3, ep 3)

West: Alice Roberts and Matt Williams visit sites in the west of Britain, including one uncovering the rituals of Stonehenge. (S4, ep 1)

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)

North: In the north of Britain, a team discovers clues to Scotland's first kingdoms and metal detectorists unearth a Viking treasure hoard. (S4, ep 3)

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)

Secrets and Lies: 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)

Families of victims and former friends open up about Stephen Griffiths, the Bradford killer who was found guilty of murdering three women in 2010. (S3, ep 3)

Built to Last: From skyscrapers like One World Trade Centre to impenetrable vaults like Fort Knox, humanity's strongest structures were engineered to defy disaster. (S3, ep 7)

UFO vs Fighter Jet, Cosmic Question Mark and Highway 97 Bigfoot Howls: Was a UFO tracking an American fighter plane? The team of experts examines the evidence to find the truth. (S5, ep 6)

Sucked Up by a Tornado, Elevators Gone Wrong, Motorcycle vs. Flood and the Indian Ocean Tsunami of 200: A woman survives being sucked into a tornado. (S1, ep 7)

The Storming of Area 51: When millions responded to a call to storm Area 51, the US military vowed deadly force. Are they hiding the truth about extraterrestrials on Earth? (S12, ep 20)