Ancient Aliens: Season 21
Season 21 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Ancient Aliens Season 20.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 21 Progress Shield
The Top Ten Extraordinary Discoveries
Feb 7, 2025 · 42 min
Ancient Aliens is counting down ten of history's most astonishing discoveries; breakthroughs that challenge traditional beliefs about human history. From a lost city hidden in the
The Top Ten Mysterious Monoliths
Feb 14, 2025 · 42 min
Ancient Aliens is counting down the world's top ten most mysterious monoliths. From a 500-ton stone believed to represent an ancient UFO, to giant statues said to have been created
The Top Ten UFO Crashes
Feb 21, 2025 · 42 min
Ancient Aliens is counting down ten of the most compelling UFO crashes that have been reported across the globe. From an acorn shaped object that crashed in the woods of rural Penn
The Top Ten Unexplained Technologies
Feb 28, 2025 · 42 min
Ancient Aliens is counting down ten of the most astonishing and unexplainable technologies in history. From mysterious golden orbs discovered in Mexico, to a sacred wooden box that
The Top Ten Secret Projects
Mar 7, 2025 · 60 min
Ancient Aliens is counting down ten of history's most compelling and covert projects that study the UFO phenomenon. From clandestine government organizations to agents that silence
The Top Ten Mysterious Mountains
Mar 14, 2025 · 60 min
Ancient Aliens is counting down ten mysterious mountains that are notorious for otherworldly phenomena. From a summit in Sri Lanka that is said to be a portal to other worlds, a v
Mysteries of the Aztecs
Mar 21, 2025 · 60 min
The Aztecs built one of the world's most powerful and feared empires and they claimed that they were guided by a pantheon of more than a thousand gods who came to Earth from differ
The Glowing Orb Phenomenon
Mar 28, 2025 · 60 min
Across the globe, reports of mysterious glowing orbs are on the rise. Their movements frequently defy the laws of physics and now they are even being reported near military bases,
The Legacy of J. Allen Hynek
Aug 29, 2025 · 60 min
Dr. J. Allen Hynek is best known as the notorious government UFO debunker who became one of the founding fathers of ufology. Was Dr. Hynek right when he ultimately concluded that t
The Volcano Factor
Sep 5, 2025 · 60 min
Volcanoes have inspired countless myths and legends, but curiously, they are also major hotspots for UFO sightings; is it possible that these geological formations, which can gener
The Birdman Mystery
Sep 12, 2025 · 60 min
Throughout the ancient world, there are depictions of mysterious figures that appear to be half human and half bird. In many cultures, they are revered as divine and have magical a
The Abduction Files
Sep 19, 2025 · 60 min
All over the world, there are people who claim they have been abducted by aliens; since the 1970s, a growing number of researchers have dedicated their lives to uncover what is beh
The Giants
Oct 2, 2025 · 60 min
Examining how thousands of years ago, people all over the world described encounters with enormous, human-like beings; exploring how some archaeologists claim to have found skeleto
Aliens in Our Midst
Oct 9, 2025 · 60 min
In the age of smartphones and social media, more evidence of otherworldly activity has come to light than ever before. From a giant "shadow monster" witnessed outside a Miami mall
Britain's UFO Files
Oct 16, 2025 · 60 min
From ancient sites like Stonehenge to the crop circle phenomenon and modern-day UFO sightings, Great Britain is a place of mysteries; exploring if throughout history this island ha
Mysteries of the Norse Gods
Oct 23, 2025 · 60 min
The ancient legends of the Norse read like modern science-fiction, with powerful gods wielding incredible weapons and high technology. Could it be that these mythological tales are
Secrets of Japan
Nov 6, 2025 · 60 min
Japan is a land rich with ancient mysteries, and recently, it has also become known as a UFO hotspot. Could it be, as Ancient Astronaut Theorists suggest, that this island nation h