Paul searches for evidence that extra-terrestrials are among us. He unearths long-buried files that could lead to an alien cover-up all the way to the White House.

Paul treks deep into the woods of the Midwest in search of Bigfoot. He cuts through hoaxes and misinformation to uncover ground-breaking evidence.

Mireya and Ronny return to where they heard whistles and saw glowing eyes. Meanwhile, Mireya agrees to be bait in order to lure out Bigfoot.

After Russell records thermal imagery that he believes is Bigfoot, Mireya and Ronny have a terrifying experience when they realise they're not alone.

Rob heads to California to investigate a network for major fault lines that could set off a mega-quake. Plus, he explores a mysterious sinkhole.

Rob Nelson investigates a cluster of ancient ruins in New England that suggest Europeans arrived in the Americas almost 1,000 years before Columbus.

How do they use ancient techniques and modern technology to produce thousands of tonnes of barbecue charcoal? How do they cook up Japan's soba noodles?

How do they grow America's only freshwater pearls in Tennessee? Plus, what secrets are behind how the world's sharpest knives are made?

How do they turn root vegetables into sweet sugar? How do they make feather dusters? And, how do they make billions of balloons to keep parties popping?

How do they turn trees into pencils? How do they make liquorice? And, how do they use traditional techniques to weave the world's most fashionable lace?

How does one family in America make three quarters of the world's peppermint oil? Plus, how are performance-enhancing tennis racquets made?

Three teams face off in a festive engineering challenge that have them blasting trees into the centre of Christmas Town and assisting Santa in his chimney ascent.

The teams must make an expedited delivery of letters, send decorations to Christmas Town without breaking a bauble and give Santa's sleigh a turbo boost.

Dwarf planets are some of the solar system's most active places, from oceans of liquid water on Pluto to vanishing volcanoes on icy Ceres.

A look at some of the most mind-blowing footage experts have seen - including see-through animals, algae-powered motorcycles and human sized chickens.

A showcase of Mother Nature's most amazing moments, featuring a man eaten alive by leeches and another who pulls a car with his eye sockets.

How do they make cheddar, the world's most popular cheese? How do they breathe life into Rususci Anne - the plastic woman that teaches CPR?

How do Ford produce the ubiquitous white van, the Transit? Plus, how do they ensure the Driza-bone coat lives up to its name?

How do they make wood-burning stoves that bring warmth to the Norwegian winter? Plus, how did they build the synthesiser that changed music forever?

How do they assemble the reinvented Morgan 3 Wheeler? Plus, how do they protect firefighters' hands from heat, flame and chemical attack?

How do they make wind turbines with twice the wingspan of a Boeing? Plus, how do they mould car tyres from the ooze of a tree?

How do they make the tank piercing super bullet? Plus, how do they forge the infamous torture weapon, the dentist's drill?

Richard explores one of the world's biggest man-made engineering projects: the Kölnbrein Dam, which can hold back an incredible 200 million tonnes of water!

Richard joins the crew of one of the biggest moving objects on earth, the Marie Maersk container ship, on her continuous 28,000-mile voyage from Asia to Europe.

Two pioneers in electric power both aim to develop technologies that reduce carbon emissions - both using electric motors and batteries in aviation and speedboats.

Scientists have discovered evidence of a mysterious ninth planet on the very edge of our solar system, could its moons support extra-terrestrial life?

The Universe is a violent and dangerous place. From exploding stars and colliding galaxies to nebula shockwaves - what are the worst places in the Universe?

How do they make the perfect surfboard for catching waves? Plus, how do they turn Danish cream into one of the world's favourite butters?

How are million-dollar racehorses transported across the world to their new owners? Plus, what creative methods are used to photograph food?

How do they produce a million tonnes of stainless steel? How do they keep cash safe with an uncrackable lock? How do they make traditional Indian sugar?

How do they harvest three thousand tonnes a year of the world's weirdest seafood delicacy? Plus, how do they protect water polo players from injury?

How do they build one of the world's most exclusive luxury cars? How do they make a referee's whistle that can be heard above 50,000 screaming fans?

How do they turn English willow into cricket bats for India's finest cricketers? And, how do they construct the foundations for tall buildings?

A look at how everyday items including steel pulleys and acetate eyewear are made, revealing the materials and unique production processes used in making them.

More everyday items go under the microscope, revealing their production. How are objects including gyroscopic stabilizers made?

More everyday items go under the microscope, revealing their production. How are objects including shuffleboard tables made?

More everyday items go under the microscope, revealing their production. How are objects including air hockey tables made?

Heavily inspired by superbike designs, the KTM X-Bow is always road and race ready. What elements come together to create this powerful and innovative vehicle?

The Tesla Model S is a high-performance and high-speed vehicle with zero emissions. What goes into the construction of this innovative electric car?

The Superformance MKIII draws inspiration from the Shelby Cobra to be an impressive combination of style and power. How is this stunning vehicle made?

The Koenigsegg One:1 is a record-breaking mega car that has a perfect power to weight ratio. How is this cleverly designed car put together?

Paul investigates a surge in demonic activity in America that is overwhelming the Catholic Church. He follows leads from Gary, Indiana, to Mineral Wells, Texas.