The team go on a dangerous search in the Sea of Japan and along Australia's Great Barrier Reef to investigate reports of a jellyfish invasion that threatens to turn oceans into deadly places to swim.

The Universe

We can't compare anything on earth to the biggest things known in space. The Lymann Alpha blob is a bubble like structure containing countless galaxies–perhaps the biggest object in the entire universe.

Thousands of people from every part of the world have reported being abducted by aliens. Could the alien abduction phenomenon be true? If so, why are people being taken? And, more importantly, why are they being returned?

A century-old family's secret lures Kevin and the team back to Georgia where new finds suggest that there's more Civil War gold to be discovered.

From greed and gore to Grand Masters, we recreate this covert world of secrets and power.

What would happen if all humans vanished? Would LA's palm trees spark a huge inferno? What would become of New York? And which animals would take control from man?

Intrepid host Josh Bernstein goes in search of the legendary lost City of Gold. From the peaks of the Andes to the depths of the Amazon, can he find the truth?

Investigation into a huge pulsating light spotted in the sky near Ohio in 1994. A radar operator describes what he saw, explaining he had "never seen anything move so fast".

The team go on a dangerous search in the Sea of Japan and along Australia's Great Barrier Reef to investigate reports of a jellyfish invasion that threatens to turn oceans into deadly places to swim.

The Universe

We can't compare anything on earth to the biggest things known in space. The Lymann Alpha blob is a bubble like structure containing countless galaxies–perhaps the biggest object in the entire universe.

Thousands of people from every part of the world have reported being abducted by aliens. Could the alien abduction phenomenon be true? If so, why are people being taken? And, more importantly, why are they being returned?

A century-old family's secret lures Kevin and the team back to Georgia where new finds suggest that there's more Civil War gold to be discovered.

From greed and gore to Grand Masters, we recreate this covert world of secrets and power.

What would happen if all humans vanished? Would LA's palm trees spark a huge inferno? What would become of New York? And which animals would take control from man?

Intrepid host Josh Bernstein goes in search of the legendary lost City of Gold. From the peaks of the Andes to the depths of the Amazon, can he find the truth?

Investigation into a huge pulsating light spotted in the sky near Ohio in 1994. A radar operator describes what he saw, explaining he had "never seen anything move so fast".

The team go on a dangerous search in the Sea of Japan and along Australia's Great Barrier Reef to investigate reports of a jellyfish invasion that threatens to turn oceans into deadly places to swim.

The Universe

We can't compare anything on earth to the biggest things known in space. The Lymann Alpha blob is a bubble like structure containing countless galaxies–perhaps the biggest object in the entire universe.

Thousands of people from every part of the world have reported being abducted by aliens. Could the alien abduction phenomenon be true? If so, why are people being taken? And, more importantly, why are they being returned?

A century-old family's secret lures Kevin and the team back to Georgia where new finds suggest that there's more Civil War gold to be discovered.

From greed and gore to Grand Masters, we recreate this covert world of secrets and power.

What would happen if all humans vanished? Would LA's palm trees spark a huge inferno? What would become of New York? And which animals would take control from man?

Experts investigate the alleged crash of an alien craft in Texas in 1897, debris of which was reportedly thrown down a well while an alien body was buried in a local graveyard.

Investigating 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.

The Universe

Delve into the myths, misconceptions, truths and amazing mysteries of our unique universe. Could life exist on Mars? Is time travel possible and does Einstein's theory of relativity support it?

Of all the Hindu gods, none is more important than Shiva, the destroyer. Theorists suggest this being that possessed incredible weapons and supernatural abilities may have been an extraterrestrial leader who came to Earth with advanced technology.

Scotland is a ground zero for some of the most significant geologic cataclysms in Earth's history. Understanding of these titanic shifts was prompted by a mysterious lake known as Loch Ness.

He was the Norse protector god who battled ogres and a giant serpent. But do historians believe he existed? New discoveries finally unlock the truth behind Thor, god of thunder.

The team heads to Colorado Springs to search for the remains of Nikola Tesla's mysterious laboratory and attempt to prove that Tesla's design for generating wireless electricity actually works.

Queen Nefertiti was once the most beautiful and powerful woman in Egypt - renowned in the ancient world. But she vanished without a trace, lost to the sands of Egypt for more than three thousand years.

Experts investigate the alleged crash of an alien craft in Texas in 1897, debris of which was reportedly thrown down a well while an alien body was buried in a local graveyard.

Investigating 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.