Britain's Roswell: In December 1980, Air Force personnel witnessed strange lights hovering above the English countryside. Did they have a close encounter with alien spacecraft? (S1, ep 13)
Brazil's Roswell: In 1977, a remote Brazilian island was visited nightly by strange flying objects, leaving people with bizarre puncture marks and blood loss. What happened? (S1, ep 12)
Beyond The War Of The Worlds: HG Wells' classic tale of a Martian invasion has terrified audiences for more than 100 years. The history of its many retellings is revealed. (S1, ep 11)
Some experts claim that UFO wreckage is stored in a top-secret facility in Dayton, Ohio. Former employees spin a tale of alien bodies and flying saucer debris. (S1, ep 10)
Texas' Roswell: In April 1897, an unidentified craft crashed in Aurora, Texas. Locals claimed they buried the spaceship and its alien pilot. Can a new search uncover the remains? (S1, ep 9)
Cattle Mutilations: The bloodless murder of livestock has plagued farmlands worldwide for generations. Are extraterrestrial beings responsible? (S1, ep 8)
Alien Encounters: An examination of what ufology calls "trace cases", where physical material from an encounter is analysed to determine if it is evidence of an alien contact. (S1, ep 7)
The Grey's Agenda: Alien abductees undergo hypnotic regression to see if there is any truth in their stories. (S1, ep 6)
China's Roswell: In 1938, hundreds of mysterious stone disks were found in a cave in China. Some believe the stones are proof of contact with an alien race. Fact or fiction? (S1, ep 5)
Sightings of the 70s: Accounts from a number of UFO sightings that took place in the 1970s, including the most famous of all intergalactic crashes: Roswell.