1/4 Sian Eleri tracks down the schoolboys whose reports of a UFO encounter sparked everything. (R)
2/4 Sian heads to the hilltop hotel where a woman claims she had seen 'creatures'. (R)
3/4 Sian Eleri鈥檚 investigation takes a darker turn as the sightings spread. (R)
4/4 Sian Eleri concludes her investigation into the Welsh schoolboys鈥� UFO sightings. (R)
