UFOs: Investigating the Unknown

3 full episodes that National Geographic Channel posts free on National Geographic, its own YouTube channel, in the order their own titles number them. Each plays in YouTube's player, with YouTube's ads, loaded only when you press Play on its page.

Start with the first episode

Full episodes

  1. People Who Experienced Aliens (Full Episode) | UFOs: Investigating the Unknown | Nat Geo Full episode · Posted 2026 · 44 min Free with YouTube's ads, posted by National Geographic
  2. Alien Encounters (Full Episode) | UFOs: Investigating the Unknown | National Geographic Full episode · Posted 2026 · 44 min Free with YouTube's ads, posted by National Geographic
  3. Are We Alone? The Search for Alien Life (Full Episode) | UFOs: Investigating the Unknown | Nat Geo Full episode · Posted 2026 · 44 min Free with YouTube's ads, posted by National Geographic