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

Ancient UFOs: From the lore and history of ancient Egypt to the myths of Native Americans, mankind's past is riddled with the evidence of UFOs. (S1, ep 5)

West: Alice Roberts and Matt Williams visit the Dorset Country Museum, where they explore finds from archaeological digs across the west of Britain. (S3, ep 2)

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)

Sarah Payne: The eight year-old's disappearance and murder shocked the nation. Here, Sarah's mum reveals her tireless campaign to protect other children from paedophilia.

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

Circles from the Sky: 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)

Unholy Alliances: When governments strike dark deals with cults, mobs and even sworn enemies, frosty relationships and mounting tensions are tested head on. (S1, ep 10)

The Spitfire - A British Fighter Legend: 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)

Beverley Allitt was thought to be a 'model' nurse. Very astute, caring and always willing to help, why did she murder four children and attempt to kill 11 others? (S1, ep 5)

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

Circles from the Sky: 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)

Wrath of God: Sacred buildings around the world begin to crumble without humans to maintain them. Clues about the planet's future lie in an abandoned desert town. (S2, ep 1)

Toxic Revenge: Deadly toxins are unleashed upon the world without humans to contain them, turning lakes and rivers into streams of acid. (S2, ep 2)

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)

Last Supper: Insects and rodents swarm supermarkets, but some food lasts forever. An unusual paint ingredient in Da Vinci's The Last Supper seals its fate. (S2, ep 4)

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)

Explore the most dangerous hotel on the planet, check out the world's most fascinating beaches, visit a used car market in Benin and take a tour of a diamond mine in Russia. (S1, ep 12)

Deathbed Confessions: Many believe that extraterrestrial secrets are not just limited to the military - so could deathbed confessions provide evidence of the existence of UFOs? (S1, ep 6)

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)

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

In 218 BC, a Carthaginian army set out to challenge the might of Rome. The route chosen by Hannibal has been disputed ever since and researchers believe they could now have the answer.

The New Evidence: Specialists in the field of the extraterrestrial examine new evidence that suggests there was extraterrestrial intervention on Earth in the distant past. (S9, ep 1)

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)

Deathbed Confessions: Many believe that extraterrestrial secrets are not just limited to the military - so could deathbed confessions provide evidence of the existence of UFOs? (S1, ep 6)

Wrath of God: Sacred buildings around the world begin to crumble without humans to maintain them. Clues about the planet's future lie in an abandoned desert town. (S2, ep 1)

Toxic Revenge: Deadly toxins are unleashed upon the world without humans to contain them, turning lakes and rivers into streams of acid. (S2, ep 2)

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)

Beverley Allitt was thought to be a 'model' nurse. Very astute, caring and always willing to help, why did she murder four children and attempt to kill 11 others? (S1, ep 5)

The Alien Wars: Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9)

The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10)

Deep space: NASA's covert plan to blow up the moon with a nuclear warhead and how U.S. attempts to put spies in orbit paved the way for the first space station. (S1, ep 8)

Me-109: 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)

Bludgeoned to death whilst walking down a country lane, the horrific murders of Lin and Megan Russell made worldwide news. Discover the events of that shocking day. (S1, ep 4)

The Alien Wars: Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9)

The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10)

Alien Messages: Could some of our ancient texts and structures be home to secret messages left by alien ancestors? If so, what can we learn from them? (S1, ep 6)

Aliens And The Lost Ark: Experts on the extraterrestrial investigate the possibility of the religious relic being an alien artefact. (S1, ep 7)

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)

Mysteries of Scotland: Home to mysterious stone circles, stories of strange beings and reported sightings, Scotland has always been an epicentre of otherworldly phenomena. (S16, ep 8)

The UFO Superhighway: With so many strange reports of UFOs, animal mutilations and more, a specific latitude north of the Earth's equator has been dubbed 'the UFO Superhighway'. (S16, ep 8)

Travel to the richest country on the planet, take a tour of a mind-blowing hotel in Italy, visit a chicken-shaped church in Indonesia and discover the hidden world under Moscow. (S1, ep 13)

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

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)

Female Fuhrers: A look at the women who surrounded Hitler after he came to power and how they were held up as an Aryan ideal for German society to strive for. (S1, ep 1)

Constantine the Great: A new emperor with a huge vision and undeniable power slowly gains control of the entire Roman empire following the end of the civil wars. (S1, ep 10)

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)