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Aliens And Insects: Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S6, ep 10)

Whodunit: After an intense search for more tangible evidence, Peter and Elroy take their investigation in a new direction. (S2, ep 5)

Power Couples: Three of the most extravagant and expensive weddings in history are profiled. Lavish and luxurious was the only way to celebrate for these big spenders. (S1, ep 9)

Holy Rollers: Meet the ancients who bankrolled the construction of massive churches and temples in a desperate attempt to buy their way into heaven. (S1, ep 10)

Heraklion Operation: On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission. (S1, ep 1)

Frankton Operation: Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships. (S1, ep 2)

Snapshot: Ten glassblowers take up the challenge to make a piece of art that represents who they are, by using photographs from their past. (S1, ep 1)

Potluck Party: The remaining contestants create masterpieces such as a bento box and a glass taco stand in a food-themed challenge. (S1, ep 2)

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11)

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12)

From December 1941 to May 1942, Singapore falls, the Wannsee Conference is held in Berlin and a single event in the Pacific transforms the war into a total global conflict.

By Spring 1942, German armies had taken control, the battles of Midway and Stalingrad begin and American's achieve a ground-breaking milestone in the development of atomic weapons.

The Battle Of Moscow: A look from the Russian perspective at the siege of Moscow, where Soviet troops adopted a 'not a step back' policy while facing the advancing German army. (S1, ep 2)

Vikings: Helen Skelton and Alex Langlands venture to Lindisfarne and the Isle of Man to unearth the secrets of Viking burial grounds. (S1, ep 6)

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)

Canterbury Murder: The River Hunters head to Canterbury, where they're granted special permission to undertake the first official search of this section of the River Stour. (S2, ep 4)

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11)

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12)

Musketoon Operation: On September 15, 1942, 12 commandos from the Special Operations Executive arrived in Northern Norway by submarine on a nearly suicidal mission. (S1, ep 3)

Raincoat Operation: During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare. (S1, ep 4)

Covert Communication: From old-school "dead drops" to high-tech digital transfers, this is a look at how intelligence officers actually acquire the information collected by sources.

The Colchester Siege: The River Hunters hit the oldest town in Britain, searching the town's historic waterway for evidence of the Siege of Colchester. (S2, ep 5)

Depths of Destruction: A look at what could happen to the world underground, as minerals grow unchecked in a mine. Back on land, 400 million animals run wild in a town. (S2, ep 9)

Dannemora: Kenneth Kimes, a notorious criminal, takes a Court TV producer hostage, adding a new layer of tension. (S1, ep 5)

San Quentin: San Quentin, located on the San Francisco Bay, is California's oldest prison dating back to the gold rush and home to the state's only gas chamber. (S1, ep 6)

The Gladiatrix: Emperor Trajan throws his great games of AD 107 and the crowd is treated to the rare spectacle of female gladiators. (S1, ep 4)

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11)