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Barbarossa: In 1941, Germany launched Operation Barbarossa, a savage attack on the Soviet Union. Witness Hitler's dream to conquer Moscow through newly colourised film. (S1, ep 2)

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7)

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8)

War: Explore moments, motives and ramifications in war that have shaped recent history, from World War I and "the eleventh day of the eleventh month" to Operation Desert Storm. (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)

Lost & Confused - Sharp Top Mountain B-25 Crash: Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew. (S1, ep 1)

Sikorski's Last Flight: 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)

Agriculture: What do the plans to terraform Mars and the ancient Egyptians' irrigation of the River Nile have in common? Find out why no agriculture would mean no culture at all.

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9)

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10)

Spitfire Tiger: Two iconic machines of World War II - the Spitfire symbolised British hope and resistance, while the Tiger tank embodied German power. (S1, ep 1)

Phantom Cobra: The Vietnam war changed aerial warfare in more ways than one. The Phantom became the first true fighter bomber of the modern era. (S1, ep 2)

The Secret War: A gripping look from the Russian perspective at the amazing World War II intelligence coups pulled off by the USSR - a nation obsessed with secrecy and espionage. (8 of 10)

Invaders: Dr Alice Roberts visits excavations in Orkney and York on the hunt for Viking relics. Finds include an amazing collection of silver and gold. (S2, ep 2)

Ice and Stone: Alice Roberts learns more about mankind's Stone Age ancestors, and travels to Jersey to meet a team hoping to shed new light on the Neanderthals. (S2, ep 4)

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

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9)

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10)

A 23-year-old Hitler, living hand-to-mouth as a painter in Vienna, Austria, discovers a sacred spear in the city's Hofburg Museum. (S3, ep 7)

In 1943, the inmates of the Death Camp at Sobibor staged an organised rebellion against their Nazi oppressors. (S3, ep 8)

Romans: Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town? (S2, ep 2)

Civil War Oxford: 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)

When a man-made island mysteriously appears off the US coast, grisly new evidence points to secret government experiments into psycho-chemical warfare. (S4, ep 5)

Death of the Old Rules: Follow the American Mafia from their early development in New York City neighbourhoods, discovering how public violence affected their operations. (S1, ep 1)

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9)