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The Return: If aliens came calling, who would speak on behalf of humans? Discover what protocols exist should extraterrestrials contact Earth. (S1, ep 5)

Element 115: 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)

Stirling: Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold. (S1, ep 5)

Between September 1940 and November 1941, things intensify as Nazi Germany exert their dominance over Europe. (S1, ep 2)

Parallel Worlds: While hiking a woman has a terrifying encounter with an entity from another world. (S2, ep 5)

In 1980, soldiers encounter a luminous craft and dancing red lights in Suffolk. Witnesses report a metallic UFO hovering over water and crashing in Nova Scotia in 1967. (S1, ep 7)

A silent football-shaped object causes grave concern when it's spotted in Maine in 1975. In 1946, a UFO crashes and causes a deafening explosion as it crashes in northern Sweden. (S1, ep 8)

Aliens Contacts: 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)

The Gods of Greece: Explore whether the Gods of Greece including Zeus, Apollo and Poseidon, were actually extra-terrestrial visitors to Earth. (S15, ep 18)

Carrickfergus: Dan visits one of Northern Ireland's oldest castles, Carrickfergus, to learn more about the tempestuous relationship between Britain and Ireland. (S1, ep 6)

Unlocking the Secrets of the Nazca Lines: Explore the top theories behind why the ancient Peruvians built the Nazca Lines. (S4, ep 19)

During World War II, British warships were struck by a secret weapon invented by the Italian Navy - the 'human torpedo'. Hear the full story, from disastrous missions to ultimate success.

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)

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)

Deliverance: Churchill's - and Britain's - influence begins to shrink as the Soviet Union and the United States grow into the most significant actors in the war. (4 of 4)

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)

Adam, Gwen and Julie recall personal encounters with UFOs, before experts' theories are put in doubt when we learn that each individual has time missing from their encounters. (S1, ep 2)

Jonah and the Whale: ISIS detonate explosives under Jonah's tomb, revealing an ancient temple complex. The findings tell the story of a despot, a fertility cult and much more. (S5, ep 1)

The Pyramid Tool Kit, the Killer Foot Machine and the Lost Head: Examine an ancient pyramid toolkit, a device that unleashes lethal X-rays and a divisive terracotta sculpture. (S2, ep 6)

A girl finds a 1000-year-old skull that may prove aliens once walked the planet, and ancient stone carvings could rewrite the story of evolution. (S2, ep 10)

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)

Wonders Of The Ancient World: William Shatner digs deep into our ancient past to discover our predecessors' epic feats of engineering, from the remarkable to the inexplicable. (S3, ep 20)

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)

King Edward II - a Mysterious Death: Experts investigate the mysterious demise of Edward II of England, who was held in custody by his wife and a group of barons. (S1, ep 2)

The Illuminati: While the Illuminati secret order was disbanded in 1785, many believe this elite group still hold the power and pull strings from behind closed doors. (S1, ep 2)