Former U.S. government insiders team up to reveal what the government knows about UFOs, led by Luis Lue Elizondo, who ran the U.S. government's $22 million secret UFO program; Elizondo reveals new details about his Pentagon investigation.

A former U.S. Navy radar operator emerges from the shadows to reveal the terrifying day it rained UFOs; evidence of a U.S. military coverup emerges, as the team gets a major lead guiding them to an island with a clandestine history of UFO activity.

The list of military eyewitnesses describing strange and threatening unidentified craft in U.S. airspace is growing; Lue Elizondo and a new partner follow the trail and find that these unidentified craft are still seen; new chilling details emerge.

Evidence continues to mount and patterns emerge, as a group of former U.S. government insiders seek the truth behind UFOs; two more eyewitnesses describe a mass sighting of UFOs within striking distance of one of the most important cities in the U.S.

The team follows a trail of explosive evidence connecting UFOs to the most destructive weapons in human history. A former U.S Air Force Colonel discloses an encounter on Christmas Eve 1980 at a base hiding a secret stockpile of nuclear weapons.

The investigation uncovers shocking video evidence, patterns, secret coordinates and jarring eyewitness testimony about UFOs; following a lead, the team goes to an allied European country to probe a case.