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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)

Doctor Harold Shipman was convicted of killing 15 patients in 2000, but he is thought to have killed up to 215. Discover how he was eventually caught by detectives. (S1, ep 2)

The Normandy Campaign: Retrace the 100 days of battle as the Allies liberated Normandy, broke through the German line and paved the way towards victory. (S1, ep 2 of 2)

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

Warships of The World Wars: We examine how the battleship began the 20th century as a dominant force, but then saw its weaknesses exploited mercilessly in the World Wars. (S1, ep 1)

The guys find a barber shop shrine to the Toronto Maple Leafs, Sheldon challenges Scott to a 15-minute pick-a-thon and a new employee joins the Calgary warehouse staff. (S4, ep 2)

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5)

Secrets of the Maya: When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6)

Conquering Heroes: Explore how the Axis Powers' ruthless, brutal occupation and exploitation of other countries contributed to their demise. (S1, ep 3)

The Vessels That Saved D-Day: A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible. (S1, ep 3)

Democracy Without Democrats 1929-1933: A protest turns into a racist and anti-Jewish movement during the 1920s and the NSDAP use emotions to gain the loyalty of the people. (S1, ep 3)

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5)

Secrets of the Maya: When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6)

Viking Gods: Ancient alien experts investigate the mysterious and fearsome Norse Gods. Were they divine? Or could the all-powerful Vikings have been guided by aliens? (S5, ep 6)

Von Daniken Legacy: A look at the controversial ancient alien theories of Erich von Däniken, whose books have sold over 65 million copies worldwide. (S5, ep 7)

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)

Alien Operations: Experts investigate reports of bird-like figures that practised advanced medical science in ancient times. Could they have been extra-terrestrial? (S5, ep 9)

Mysterious Relics: Experts investigate mysterious relics that have been revered by cultures for millennia. Could these sacred items truly hold divine or otherworldly power? (S5, ep 10)

Submarines: War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2)

The story of Yorkshire Ripper Peter Sutcliffe, who murdered 13 women during a five-year killing spree that began in 1975. (S3, ep 4)

Deceit and Delusion 1923-1928: Hitler appears to be eliminated after his failed putsch in 1923. Discover how the Nazi movement used democracy's tolerance in Germany to come back. (S1, ep 2)

War and Conflict: Examine how conflict has reshaped nations and devastated generations. Wars dominate history but the reasons for them starting are constantly disputed. (S1, ep 3)

Thutmose III- The Battle of Meggido: Founded the legend of the most warlike of pharaohs, Thutmose III, who reinvented warfare for millennia to come. (S1, ep 1)

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5)