WATCH ONLINE, MOBILE, FREEVIEW 64, SKY 164, SKY GLASS / SKY STREAM 168, FREESAT 162 AND VIRGIN 174
Cops vs UFOs: Hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated UFO encounters. (S1, ep 1)
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)
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)
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)
Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5)
Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6)
Invasion Texas 2008: The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky. (S1, ep 7)
UFO Dogfights: The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO. (S1, ep 8)
Vortexes: The team travels to Sedona, Arizona, long known for strange phenomena, to interview witnesses to unexplained sightings of lights and objects in the skies. (S1, ep 9)
The NASA Files: The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand. (S1, ep 10)
Military vs. UFOs: The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up. (S1, ep 11)
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)
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)
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)
First Contact: Experts investigate a reported crash of an alien craft in Texas in 1897, debris of which was allegedly thrown down a well and an alien body buried locally. (S2, ep 4)
The Real Roswell: The story of a UFO crashing in Roswell is the most famous case in UFO history. Now, a theory has emerged that there was more than one crash site. (S2, ep 5)
Arizona Lights: On 13 March, 1997, a string of fiery globes were seen over Arizona, but earlier that night some eyewitnesses saw something more shocking . (S2, ep 6)
Lost UFO Files: The team recovers physicist James McDonald's lost research, including interviews with more than 500 witnesses of UFOs and revealing government documents. (S2, ep 7)
Alien Fallout: After seeing an odd flying object in 1980, a woman was hospitalised as she lost clumps of hair and skin. The team reopens her potential 'alien effects' case. (S2, ep 8)
UFO Storm: In 2008, the UK's Ministry of Defence released decades' worth of classified UFO files to the public. One month later, UFO hysteria ripped through the country. (S2, ep 9)
Giant UFOs: The team probes some of the largest sightings of alleged UFOs ever recorded over the English Channel, including two eerie objects spotted by pilots in 2007. (S2, ep 10)
Aliens at the Airport: The team investigate a strange object seen over Chicago's O'Hare Airport in 2006. Are aliens watching our airports? (S2, ep 11)
Alien Crashes: In 2008, witnesses saw military helicopters carry away a glowing object. What was the government trying to hide? And could UFO clean-ups be common? (S2, ep 12)
Area 51 Revealed: The team heads to Area 51, where they interrogate former employees of the alleged storage site for alien spacecraft. (S2, ep 13)
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)
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)
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)
Nazi UFOs: Upon learning about a connection between the UFO phenomenon and the Third Reich, the team travel to Germany and Poland to investigate. (S3, ep 4)
Underwater Alien Bases: The team investigates what appear to be underwater landing strips and other strange evidence in the wake of UFO sightings in Florida. (S3, ep 5)
UFO Relic: The team examines the most compelling examples of UFO relics available, like a unique and other-worldly piece of metal in Missouri. (S3, ep 6)
Alien Harvest: The team investigate eyewitness reports of cattle slaughter allegedly caused by UFOs, and are hot on the trail of a recent mutilation case. (S3, ep 7)
Underwater Area 51: The team investigate the highly secretive underwater testing facility AUTEC, said to be used by the US Navy for weapons testing and underwater research. (S3, ep 8)
The Silencers: UFOs are the biggest mystery of our time and somebody - or something - seems determined to keep it that way. (S3, ep 9)
Area 52: Area 51 is considered the ultimate top secret facility, but there is another military site, known as Area 52, where strange phenomena have been witnessed for 10 years. (S3, ep 10)
Dark Presence: The team investigates growing numbers of flying orbs sightings, with witnesses also experiencing odd dreams, premonitions and deep fear. (S3, ep 11)
First Response: The team attempts to uncover the US military's first responses to UFO encounters, leading them to revisit a suspected UFO crash site in California. (S3, ep 12)
UFO Surveillance: The team investigates videos indicating a strong UFO surveillance presence at weapons laboratories. (S3, ep 13)