Real UFOs: A look at the secret flying saucers designed by the military around the world. Sightings in the US, South Africa, Russia, Australia and Canada have all given the locals a fright.
Mexico's Roswell: In 1974, the US government was tracking a UFO when it disappeared over Coyame, Mexico. At the same time, a civilian plane crashed. Why was it all covered up? (S1, ep 14)
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)