Alien Engineering (Part 1 of 2): What would happen if a UFO actually did land on Earth and humans found it? Engineers create a 'spaceship' to see how alien technology could work. (S1, ep 1)
Experts investigate more strange sightings, including a silver missile travelling too quickly for pilots to pursue, and mysterious lights seen by thousands over Belgium. (S1, ep 7)
More strange stories come under the spotlight, including that of a disappearing US pilot, strange incidents in a Sicilian fishing village and a weird encounter over Germany. (S1, ep 6)
Witnesses reveal the story of a strange phenomenon in a remote Italian village. Strange objects are spotted over Sweden and a UFO is reported in Portugal. (S1, ep 5)
Witnesses are baffled as strange flying objects start appearing over Europe. Everywhere from Portugal to Romania, big questions are left unanswered. (S1, ep 4)
An Air France pilot sees a huge object over Paris, UFOs are spotted over a quiet town in Portugal, and lone drivers in Denmark experience something rather strange... (S1, ep 3)
Strange lights, a government cover-up and something odd above the woods - experts revisit the Swedish Mora UFO photos, Mussolini's UFO files and the Rendlesham forest incident. (S1, ep 2)
Unknown objects, weird lights and a shocking criminal investigation - check out Scotland's Livingston UFO, Norway's Hessdalen lights and Portugal's Castelo de Bode Dam encounter. (S1, ep 1)
Devils and Hell: Exploring the legends of Netherworld monsters like the Jersey Devil said to roam the New Jersey Pine Barrens, and Krampus, the goat-legged Christmas demon. (S1, ep 2)
Cannibals And Killers: Exploring surprising truths behind mythical monsters and legendary killers. This time, how did a fairy tale inspire the Chicago World's Fair killer? (S1, ep 1)