A fireball in the sky over Sri Lanka in 2012 is followed days later by a mysterious downpour of red rain. During the search for a rational explanation, investigators find evidence of strange living cells with no earthly comparison.

On March 24, 1967, men see an unidentified object hovering over Montana’s Malmstrom Air Force Base, home to nuclear weapons, which are all disabled simultaneously.

Bizarre, hairless, blue-eyed and hunch-backed creatures have invaded Texas, attacking and mutilating livestock. Now there is evidence they are breeding and their population is set to explode. Scientists are mystified, the authorities are in denia ...

Southeast of Mexico City, hundreds goats are found dead and completely drained of blood. Is this the work of the legendary chupacabra?

Hear from Director Sean Smith and go behind the filming of Fred Valentich's story - the pilot who mysteriously vanished along with his plane over Australia in 1978.

A strange dog-like predator has been spotted in Texas and believed to be responsible for slaughtering livestock and draining the corpses of blood. Could it be related to the chupucabra?

Area 51 in Nevada is America's most secret air base. State-of-the-art aircraft have been developed here for decades, but does it also hold clues to UFOs?

Pilot Fred Valentich's last words were "it’s above me and it’s not an aircraft." Then a mysterious metallic sounded through the radio just before the pilot and his plane vanished without a trace. Is this evidence of UFO contact?

Why would sailors mysteriously vanish from a boat, leaving behind all of their equipment with no signs of struggle?

Mysterious phenomena and bizarre sightings seems to follow one distinct geographic line across America: a paranormal highway.

In 1996, a startling find in Russia raised many questions. Is this a tiny, deformed baby or a creature from out of this world?

Residents of a small Italian village report everyday objects suddenly bursting into flames for no apparent reason. Are the mysterious fires connected to something alien?

Northern Europe's Baltic Sea is one of the most dangerous seas on Earth and hides a thousand wrecks on its bottom. One massive finding under its surface isn't like the others, however.

Cusco was the capital of the ancient Inca civilization and home to some of the Incas' most sacred sites. Is this skeleton from a human sacrifice or something extraterrestrial?

The Flannan Isles is a desolate place, home to one of Scotland’s greatest mysteries: three lighthouse keepers who vanished without a trace. Was it a rogue wave or something more sinister?

In 1980, a British police officer claimed he saw a UFO. Was the sighting linked to a dead body found “as if dropped from the sky”? Was there a cover-up?