Sky History 2 HD Tuesday

William Shatner brings thought-provoking questions to leading experts, and they explore everything from human origins to groundbreaking archaeological finds

An examination of footage said to show alien pilots in a UFO cockpit. Plus, the claims that a Australian man stumbled upon an alien corpse on the pavement

A trip to Harvard University's Warren Anatomical Museum, where one of the displays is the shattered skull of a 19th-century American railway worker

The presenter is joined by Bruno Tonioli to look at key battle tactics during the Roman Invasion - such as the complexity of firing a catapult

Investigations into the power of the number three in history, science and astronomy, and its possible links to extraterrestrial life

Experts visit an ancient fortress in Peru believed to have been built by aliens using tools far more advanced than those thought to have been available to humans at the time

The River Hunters head to Canterbury, where they're granted special permission to search the River Stour for relics left behind by 12th-century pilgrims in the River Stour

Alice Roberts visits archaeological digs in the north of Britain, including Scotland's oldest railway, and one of the best-preserved Norman castles

The team embarks on a dangerous search in the Sea of Japan and along Australia's Great Barrier Reef to investigate reports of a deadly jellyfish invasion

Reports from Papua New Guinea of a terrifying monster with a 20-foot wingspan known as the Demon Flyer that some people think might be a prehistoric pterosaur

A trip to Harvard University's Warren Anatomical Museum, where one of the displays is the shattered skull of a 19th-century American railway worker

The notion that a video leak from the Department of Homeland Security offers more evidence that UFOs really exist. Plus, footage that proves Sasquatch is no myth

Second World War battles are reconstructed using cutting-edge CGI animation, beginning by showing how the aircraft carrier USS Enterprise battled enemy submarines in the Pacific

How Elizebeth Friedman cracked the codes that brought down the Mob and saved countless lives in the Second World War, armed with just a pencil and paper

Documentary highlighting what life was like during the Second World War, featuring the personal stories of soldiers from both sides of the conflict

Strategic catastrophes and doomed military decisions, beginning with those whose rampant egos and misguided belief in their own abilities led to fatal mistakes

Predicting the fate of priceless artefacts such as the Mona Lisa, the Declaration of Independence and the Liberty Bell in a world without humans

Investigations into the power of the number three in history, science and astronomy, and its possible links to extraterrestrial life

Experts visit an ancient fortress in Peru believed to have been built by aliens using tools far more advanced than those thought to have been available to humans at the time

Alice Roberts visits archaeological digs in the north of Britain, including Scotland's oldest railway, and one of the best-preserved Norman castles

Beau Ouimette and Rick Edwards seek artefacts from William the Conqueror's era in the stretch of the River Avon near Salisbury

Examining how the oceans would claim the casinos of Las Vegas and Atlantic City if there were no humans left on Earth, and lead to the proliferation of rats

Second World War battles are reconstructed using cutting-edge CGI animation, beginning by showing how the aircraft carrier USS Enterprise battled enemy submarines in the Pacific

Blasting off into the stars is humankind's most profound achievement. This programme considers whether such voyages into the cosmos are really a return to man's true origins