From plague victims being buried alive to body snatchers, illegal distilleries and castle dungeons, Edinburgh's underground world has a myriad of stories to tell.

The team examines the most compelling examples of UFO relics available, including a unique and other-worldly piece of metal in Missouri.

Might the tools and technology of ancient builders have come from distant galaxies? If the ancient builders did use advanced technology, could it prove that aliens visited Earth thousands of years ago?

Missing In Alaska

In 1950, a military transport plane vanished in the Alaska Triangle with 44 people on board, and hasn't been seen since. Was its disappearance caused by bad weather or something more sinister?

Plants are used for food, medicine and clothing, to build our world and change how we feel - and they have played a vital role in our evolution.

Tools and machines have allowed us to overcome our physical limitations, but they are also transforming what it means to be human.

Mother Nature unleashes a barrage of attacks around the globe. In San Francisco, an earthquake crushes commuters; a rolling avalanche devours climbers in the Himalayas; and in Nebraska, lightning strikes an unlucky storm chaser.

Evolve

How did flying creatures come to be? From the first vertebrates to take a flight to the creatures that have conquered the sky, examine the animals which have evolved to fly.

In less than 200 years, the Aztecs went from a tribe of nomads into the most powerful civilisation the New World had ever known. How did they achieve such greatness?

From plague victims being buried alive to body snatchers, illegal distilleries and castle dungeons, Edinburgh's underground world has a myriad of stories to tell.

The team examines the most compelling examples of UFO relics available, including a unique and other-worldly piece of metal in Missouri.

Might the tools and technology of ancient builders have come from distant galaxies? If the ancient builders did use advanced technology, could it prove that aliens visited Earth thousands of years ago?

Missing In Alaska

In 1950, a military transport plane vanished in the Alaska Triangle with 44 people on board, and hasn't been seen since. Was its disappearance caused by bad weather or something more sinister?

Plants are used for food, medicine and clothing, to build our world and change how we feel - and they have played a vital role in our evolution.

Tools and machines have allowed us to overcome our physical limitations, but they are also transforming what it means to be human.

Mother Nature unleashes a barrage of attacks around the globe. In San Francisco, an earthquake crushes commuters; a rolling avalanche devours climbers in the Himalayas; and in Nebraska, lightning strikes an unlucky storm chaser.

Evolve

How did flying creatures come to be? From the first vertebrates to take a flight to the creatures that have conquered the sky, examine the animals which have evolved to fly.

In less than 200 years, the Aztecs went from a tribe of nomads into the most powerful civilisation the New World had ever known. How did they achieve such greatness?

From plague victims being buried alive to body snatchers, illegal distilleries and castle dungeons, Edinburgh's underground world has a myriad of stories to tell.

The team examines the most compelling examples of UFO relics available, including a unique and other-worldly piece of metal in Missouri.

Might the tools and technology of ancient builders have come from distant galaxies? If the ancient builders did use advanced technology, could it prove that aliens visited Earth thousands of years ago?

Missing In Alaska

In 1950, a military transport plane vanished in the Alaska Triangle with 44 people on board, and hasn't been seen since. Was its disappearance caused by bad weather or something more sinister?

Plants are used for food, medicine and clothing, to build our world and change how we feel - and they have played a vital role in our evolution.

Tools and machines have allowed us to overcome our physical limitations, but they are also transforming what it means to be human.

Evolve

Engineering an Empire

They ruled over much of Europe and Asia during the Dark Ages, building stadiums, aqueducts and cathedrals. But the Byzantines' success became their downfall.

The castles and dungeons of the Hittites are hidden beneath the sandy lunar landscape of Cappadocia. Why did this ancient empire fall?

The team investigate eyewitness reports of cattle slaughter allegedly caused by UFOs, and are hot on the trail of a recent mutilation case.

During the Black Death of the Middle Ages, people reported bronze flying ships emitting a strange mist. Scientist Richard Hoover published evidence of life in meteorites. Is it possible that ancient aliens have shaped human history?

Host Brad Meltzer and viewers are on the hunt for lost and stolen history, including Hitler's personal photo albums and James Bond's original Aston Martin.

Zahi uncovers a cache of mummies at a dig site at Saqqara and discovers a rare and important piece of Egyptian history: a beautiful anthropoid sarcophagus from the 26th Dynasty!

...and the Cambodian Killing Fields: As Douglas Latchford is accused of masterminding a multimillion-dollar racket in loot stolen from Cambodia's killing fields, museums and collectors face the grim reality that they're in possession of stolen property.