Explore UFOs: Investigating the Unknown through National Geographic’s official uploads. This guide links all 12 full episodes and compilations in the series playlist, with ten individual UFO Soldier articles and embedded players.
Five newest uploads
Alien Encounters
Season 2 · The Experiencers, Part 2 · 44:16 · 388K views · Uploaded September 2026
National Geographic’s second installment about experiencers turns to reported alien abductions and the people who investigated them. It places personal accounts alongside the controversy surrounding serious academic attention to those accounts, including the work associated with psychiatrist John Mack.
Read the article & watch → · Official video ↗People Who Experienced Aliens
Season 2 · The Experiencers, Part 1 · 44:16 · 1.2M views · Uploaded Aug 21, 2026
This episode presents people who say they encountered unusual entities or experienced events they could not explain. National Geographic’s description identifies witnesses from the Ariel School in Zimbabwe and author Whitley Strieber among the accounts explored.
Read the article & watch → · Official video ↗UFO Truths Exposed: three-episode documentary
Season 2 · Three-episode compilation · 2:12:16 · 1.9M views · Uploaded Jun 27, 2026
This extended upload combines three strands of the series: whistleblower testimony, pilots describing unusual encounters, and scientists developing methods to study UAP. Its chapters move from claims about government secrecy to the practical problem of collecting and evaluating observations.
Read the article & watch → · Official video ↗How AI and physics are used to investigate UFOs
Season 2 · Scientists on the Cutting Edge · 44:16 · 1.2M views · Uploaded Jan 25, 2026
This episode shifts attention toward research tools: artificial intelligence, radar measurements, physics, and historical imagery. The focus is on ways researchers might turn an unusual observation into a testable question rather than relying on an intriguing appearance alone.
Read the article & watch → · Official video ↗Pilots Speak Out
Season 2 · Pilots Speak Out · 44:15 · 785K views · Uploaded Aug 7, 2025
A former Navy pilot’s advocacy becomes the route into a wider problem: commercial pilots who report unusual observations may fear professional consequences and lack a clear reporting process. The episode follows the push to make those reports easier to collect and assess.
Read the article & watch → · Official video ↗
Five most viewed
Secret Programs and Close Encounters: season-one compilation
Season 1 · Five-episode compilation · 3:30:10 · 8.3M views · Uploaded Oct 5, 2024
This long-form compilation brings together the first season’s investigations of military reporting, civilian cases, nuclear-base accounts, and the campaign for official transparency. It connects the history of Project Blue Book with the later debate about Navy encounters and government research.
Read the article & watch → · Official video ↗Government Breaks Silence: Strange Encounters
Season 1 · Government Breaks Silence · 42:14 · 7.4M views · Uploaded Apr 26, 2024
This episode examines Navy pilots’ reports of unusual aerial objects and the public pressure for government answers. National Geographic’s description centers on 2015 encounters in which pilots described objects whose appearance and movement did not fit what they expected to see.
Read the article & watch → · Official video ↗The Global Threat
Season 1 · International encounters and aviation safety · 42:15 · 7.1M views · Uploaded Feb 24, 2024
The Global Threat broadens the discussion beyond a single country. It considers reports of close encounters in flight and how civilian researchers, witnesses, and journalists have pressed institutions to take aviation-safety concerns seriously.
Read the article & watch → · Official video ↗Giant UFO in Texas
Season 1 · Project Blue Book and civilian reports · 42:13 · 5.6M views · Uploaded Jun 9, 2023
This installment links a prominent civilian-sighting story with the history of the Air Force’s Project Blue Book and astronomer J. Allen Hynek’s work. It examines how reports were cataloged, investigated, and communicated to the public.
Read the article & watch → · Official video ↗Secret Pentagon Program
Season 1 · Secret Pentagon UFO Program · 42:12 · 4.7M views · Uploaded Apr 9, 2023
The opening episode examines public revelations about a Pentagon effort to investigate unusual aerial reports. It follows the shift from a little-known government program to a larger debate about military observations, oversight, and disclosure.
Read the article & watch → · Official video ↗
The remaining full episodes
- UFO Whistleblower ↗ · 44:16 · 864K views
- UFO Sightings at Nuclear Bases ↗ · 42:14 · 2.3M views
How these lists were selected
Checked October 2, 2026 against National Geographic’s official series playlist. The scope is its 12 full episodes and compilations; the short trailer is excluded. The newest list follows the playlist’s upload order. View rankings use YouTube’s rounded public playlist counts at verification, which change over time. This is a ranking within this series playlist, not across every National Geographic production or streaming service.
Original broadcast dates differ from YouTube upload dates. The newest episode’s upload month is shown because an exact upload day was not returned by the source metadata. Publisher titles may also change.
For the complete television episode guide, including episodes not uploaded to YouTube, visit National Geographic’s series page. These are publisher-hosted videos; regional restrictions and embedding settings remain under the publisher’s control.