Episode 1
UFO sightings over nuclear facilities trigger high alert responses - are they top-secret aircraft or something from another world?
Episode 2
An investigation into triangular-shaped UFOs seen in the 1980s and 90s - they might be the best evidence of extraterrestrial crafts?
Episode 3
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?
Episode 4
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.
Episode 5
True stories of fighter pilot encounters with unidentified flying objects in our skies – including pilots who were ordered to ‘shoot ‘em down’.
Episode 6
Well-documented sightings of UFOs by commercial airliner pilots may be proof of danger lurking in our skies.
