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Aliens And Deadly Weapons: From gunpowder to missiles, were these lethal weapons the product of human innovation or created with help from another, otherworldly source? (S3, ep 9)

Aliens And Evil Places: Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides? (S3, ep 10)

Body Image: Hitler held many secrets he went through great lengths to hide throughout his life. This episode reveals the truth about his drug addiction and genital deformity. (2 of 4)

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 3)

Nuclear Stand Off: A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again. (S2, ep 5)

The Invasion of Grenada: In 1979, Maurice Bishop takes control of Grenada. Four years later, he is assassinated. Is this another case of the US using its might to stop Communism? (S2, ep 6)

Who's Got Game?: In this round, the competitors are tasked with creating a special piece that reflects the hurdles they have overcome in their respective pasts. (S2, ep 7)

Runway Walk: In this round, the competitors are challenged with creating an intricately crafted accessory for a high fashion look. (S2, ep 8)

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11)

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)

F15: The F15 Eagle immediately turned the tide of the first Gulf War to prove its greatness. (S2, ep 1)

B17: The mighty Flying Fortress takes to the air as we examine the background and development of one of WWII's most iconic bombers. (S2, ep 2)

The Defence Of Sevastopol: A siege at Sevastopol forced the Germans to bring in some of the biggest artillery guns ever used. See Hitler's invasion from the Russian perspective. (2 of 10)

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)

War of the Roses: In the East of Britain, Dr Alice Roberts finds new revelations from 'Britain's Pompeii' and the theatre where Shakespeare premiered Romeo and Juliet. (S5, ep 3)

Starting on the Isle of Lewis in the Outer Hebrides, witness the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses, and cut peat with a modern crofter. (2 of 4)

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11)

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)

Near the Czech border, a secret German site, "The Giant," tests The Bell, powered by Serum 525, turning all who touch it into rotting living zombies. (S3, ep 1)

1942 and Hitler has the totally barking idea of using educated dogs to do a soldier's job. The Nazi leader wants to create fearsome canines to help him win the Second World War. (S3, ep 2)

Vindolanda And WWII Spitfire: The team search for remains of the crashed WWII Spitfire and discover parts of the cockpit. (1 of 4)

Venture to England's South Coast, as we dive with sharks, explore the battlements of Drake's Island, uncover the origins of Scouts, and discover fossils on the Isle of Wight. (4 of 4)

Satellite images reveal how El Chapo escaped from a high-security prison in Mexico and a giant black stain appears in a war-torn area of Iraq. (S3, ep 10)

In Italy, enforcers are blood kin, but a labour shortage drives one of Toronto's mob factions to hire outside the family. (S1, ep 1)

The Chicago Outfit: the Capone Years: The Chicago Outfit's rise reshaped the Windy City, with tensions between Capone and the group leading to his eventual downfall. (S1, ep 7)

The Bloods: Discover the Bloods and their relentless fight against their arch-nemesis, the Crips. As tensions escalate, the conflict captures national attention. (S1, ep 10)

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11)