[2] The film includes footage or archival interviews with Kenneth Arnold, who coined the phrase "flying saucer" after his 1947 sighting; Maj. Jesse Marcel of the Roswell incident; ufologist Jacques Vallee, whose research uncovered the "Pentacle Memorandum"; witnesses to the Ariel School, the Westall UFO, the Lonnie Zamora, and the Rendlesham Forest incidents; and military personnel and other individuals connected with the Pentagon UFO videos.

[1][2][3] It also features interviews with former US Senate majority leader Harry Reid, Clinton White House chief of staff John Podesta, former deputy undersecretary for Defense Intelligence Christopher Mellon, former New Mexico governor Bill Richardson, and journalist Leslie Kean.

[4] Tom Rogan, the national security writer and online editor of the Washington Examiner said that the primary focus of the film is the broad, post-World War II history of this subject.

"[8] Brian Lowry of CNN wrote that the film is "an earnest documentary most notable for the former officials that lend credence to the notion the government knows much more than it has shared, and that the truth, well, is out there."

"[6] Nick Johnston of Vanyaland wrote that the documentary "is a surprisingly compelling watch that takes full advantage of the new and fascinating revelations about true Unidentified Flying Objects and the government's long history of denial and, ultimately its recent disclosure that, yes, these things exist and, no, we don't have a single clue what they are.

He also wrote that the film's director Fox said "Our intention in making this documentary was to create the seminal feature that would treat this subject in the manner it deserves with great intellectual integrity, and in doing so transcend the UFO community and reach a much broader audience".