For years, the team has been tracking an elusive prey only seen at night--ships, shaped like triangles, impossibly huge, and videotaped over cities around the world. But are they ours, or theirs? The team investigates numerous UFO sightings that have recently been reported in Sonora, California, a charming old West town nestled in the Sierra Nevada Mountain Range nicknamed Triangle Alley. What makes these sightings so compelling are rare daytime footage of triangles in flight. This footage will be digitally analyzed to determine if these are indeed UFOs and not military jets. The team will also visit Texas to speak to military experts and witnesses to compelling triangle sightings. It's speculated that these triangle craft have been visiting us for centuries.

Can testimony from a former detective and undercover operative, interviews with eyewitnesses, and a visit to a once top-secret government facility determine if human-alien genetic experiments happen?

They are described by hundreds of witnesses as grey-skinned beings: no ears, no nose and bulbous black eyes. Are these so called "Greys" visitors from another planet?