Travel the US and abroad to hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated, UFO encounters.

In 1990, a pilot flying his small plane off Catalina Island spotted an object just below the surface of the water which enveloped his plane with a bright light, freezing his controls.

Has the US military derived various forms of technology, including stealth technology, from downed UFOs?

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 encounters.

This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined, and had objects implanted in their bodies.

In 1947 an unknown object approaching US air space at great speed and a civilian craft out of El Paso were heading towards each other when they disappeared from radar.

The UFO Hunters travel to Stephenville, Texas, to investigate multiple reports of strange lights in the sky.

The team examine a declassified US Department of Defence report which analyses an alleged encounter between a fighter pilot and a UFO.

The team travels to Sedona, Arizona, long known for strange phenomena, to interview witnesses to unexplained sightings of lights and objects in the sky.

The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover-ups firsthand.

In 1980, British and American soldiers stationed at NATO/RAF bases near Rendlesham Forest observed a mysterious object in the sky. Was there a cover-up about these events involving the military and intelligence agencies?

Believers say that the sighting of 12 UFOs on radar triggered a military alert at Edwards Air Force Base in California on Oct. 7, 1965.

An Air Force team is in a deadly plane crash after investigating a Washington state UFO sighting reported a week before an incident in 1947 Roswell, N.M.