1. Red Alert

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. 9 January 2015. 48 min

UFO sightings over nuclear facilities trigger high alert responses - are they top-secret aircraft or something from another world?

2. Black Triangles

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. 16 January 2015. 48 min

An investigation into triangular-shaped UFOs seen in the 1980s and 90s - they might be the best evidence of extraterrestrial crafts?

3. Battle of Los Angeles

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. 23 January 2015. 48 min

Anti-aircraft guns blast the skies over Los Angeles when an unknown flying object is spotted by thousands in 1942 - is it from earth or could it be extra-terrestrial?

4. UFO Crash Sites

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. 30 January 2015. 48 min

Roswell is the most famous UFO story in history and a piece of debris found at the desert crash site might shed new light on what really happened in 1947.

5. Shoot 'em Down

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. 13 February 2015. 48 min

True stories of fighter pilot encounters with unidentified flying objects in our skies – including pilots who were ordered to ‘shoot ‘em down’.

6. UFOs vs. Airliners

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. 6 February 2015. 48 min

Well-documented sightings of UFOs by commercial airliner pilots may be proof of danger lurking in our skies.