Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4)

Underground Alien Bases: The team investigates rumours of human-alien genetic experiments reportedly going on deep below the New Mexico desert in an underground base. (S3, ep 3)

UFO Emergency: Investigation into a huge pulsating light spotted in the sky near Ohio in 1994. A radar operator describes what he saw. (S2, ep 3)

Reverse Engineering: Has the US military derived various forms of technology, including stealth technology, from downed UFOs? The UFO Magazine team investigate. (S1, ep 3)

Grey's Conspiracy: The team investigates disturbingly similar stories of alien abductions from two different countries before tracking down some potential proof in Mexico. (S3, ep 2)

Heartland Explosion: The team finds new evidence concerning the strange booms and orange lights that panicked Indiana in 2008, disbanding theories it was a military jet. (S2, ep 2)

USOs: The team use high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon. (S1, ep 2)

Giant Triangles: The team uncovers rare footage of floating giant triangles hovering over cities. Could these strange sightings be extraterrestrial in origin? (S3, ep 1)

Invasion Illinois: Series examining UFO sightings, alien abductions and government cover-ups, beginning with an investigation into multiple sightings in Illinois in 2004. (S2, ep 1)