Watch UFOs: The Lost Evidence

UFO experts examine incredible encounters between law enforcement and extraterrestrials. They then investigate whether the US government co-opted alien technology for our own space and military programs.

Native American myths steeped in the otherworldly go back thousands of years, but astonishing, new evidence and modern-day UFO sightings have experts rethinking these extraordinary legends and depictions.

Startling evidence suggests contact with interstellar travelers in the distant past may have influenced mankind and many of our sacred sites.

The Royal Air Force has been encountering and even engaging UFOs on a regular basis since World War II, but the British government has continuously denied the sightings. Experts investigate why these UFO facts have been concealed.

UFOs have been caught on camera across America, yet the government continues to deny the existence of extraterrestrial life. Recent news of the Pentagon's secret UFO program may reveal shocking evidence of what the military has known for decades.

Investigators reveal the secret history between US Presidents and the UFO phenomenon, from FDR's knowledge about a UFO battle over Los Angeles to JFK's alleged plan to share extraterrestrial secrets with the Russians.

Humanity's rapid technological advances since the mid-20th century have completely transformed the way we live. Are these innovations the result of human effort alone, or have extraterrestrials gifted them to our planet like a nefarious Trojan horse?

As long as there have been UFO sightings, there have been claims of alien abduction. This phenomena and the alleged alien implants sometimes left behind are examined in the light of never-before-seen evidence and eyewitness testimony.

Using archival audio recordings, official transcripts and incident reports, UFO researchers investigate what really happened during incredible -- and sometimes life-threatening -- encounters between law enforcement and UFOs.