Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Evidence | 2010-04-20 | 120 min |
| Season 1 | Episode 2 | The Visitors | 2010-04-27 | 120 min |
| Season 1 | Episode 3 | The Mission | 2010-05-04 | 120 min |
| Season 1 | Episode 4 | Closer Encounters | 2010-05-18 | 120 min |
| Season 1 | Episode 5 | The Return | 2010-05-25 | 120 min |
| Season 2 | Episode 1 | Mysterious Places | 2010-10-28 | 60 min |
| Season 2 | Episode 2 | Gods & Aliens | 2010-11-04 | 60 min |
| Season 2 | Episode 3 | Underwater Worlds | 2010-11-11 | 60 min |
| Season 2 | Episode 4 | Underground Aliens | 2010-11-18 | 60 min |
| Season 2 | Episode 5 | Aliens and the Third Reich | 2010-11-25 | 60 min |
| Season 2 | Episode 6 | Alien Tech | 2010-12-02 | 60 min |
| Season 2 | Episode 7 | Angels and Aliens | 2010-12-09 | 60 min |
| Season 2 | Episode 8 | Unexplained Structures | 2010-12-16 | 60 min |
| Season 2 | Episode 9 | Alien Devastations | 2010-12-23 | 60 min |
| Season 2 | Episode 10 | Alien Contacts | 2010-12-30 | 60 min |
| Season 3 | Episode 1 | Aliens and the Old West | 2011-07-28 | 60 min |
| Season 3 | Episode 2 | Aliens and Monsters | 2011-08-04 | 60 min |
| Season 3 | Episode 3 | Aliens and Sacred Places | 2011-08-11 | 60 min |
| Season 3 | Episode 4 | Aliens and Temples of Gold | 2011-08-18 | 60 min |
| Season 3 | Episode 5 | Aliens and Mysterious Rituals | 2011-08-25 | 60 min |
| Season 3 | Episode 6 | Aliens and Ancient Engineers | 2011-09-01 | 60 min |
| Season 3 | Episode 7 | Aliens, Plagues and Epidemics | 2011-09-08 | 60 min |
| Season 3 | Episode 8 | Aliens and Lost Worlds | 2011-09-15 | 60 min |
| Season 3 | Episode 9 | Aliens and Deadly Weapons | 2011-09-22 | 60 min |
| Season 3 | Episode 10 | Aliens and Evil Places | 2011-09-28 | 60 min |
| Season 3 | Episode 11 | Aliens and the Founding Fathers | 2011-10-05 | 60 min |
| Season 3 | Episode 12 | Aliens and Deadly Cults | 2011-10-12 | 60 min |
| Season 3 | Episode 13 | Aliens and the Secret Code | 2011-10-19 | 60 min |
| Season 3 | Episode 14 | Aliens and the Undead | 2011-10-26 | 60 min |
| Season 3 | Episode 15 | Aliens, Gods and Heroes | 2011-11-16 | 60 min |
| Season 3 | Episode 16 | Aliens and the Creation of Man | 2011-11-23 | 60 min |
| Season 4 | Episode 1 | The Mayan Conspiracy | 2012-02-17 | 60 min |
| Season 4 | Episode 2 | The Doomsday Prophecies | 2012-02-17 | 60 min |
| Season 4 | Episode 3 | The Greys | 2012-02-24 | 60 min |
| Season 4 | Episode 4 | Aliens and Mega-Disasters | 2012-03-02 | 60 min |
| Season 4 | Episode 5 | The NASA Connection | 2012-03-09 | 60 min |
| Season 4 | Episode 6 | The Mystery of Puma Punku | 2012-03-16 | 60 min |
| Season 4 | Episode 7 | Aliens and Bigfoot | 2012-03-23 | 60 min |
| Season 4 | Episode 8 | The Da Vinci Conspiracy | 2012-04-06 | 60 min |
| Season 4 | Episode 9 | The Time Travelers | 2012-04-27 | 60 min |
| Season 4 | Episode 10 | Aliens and Dinosaurs | 2012-05-04 | 60 min |
| Season 5 | Episode 1 | Secrets of the Pyramids | 2012-12-21 | 60 min |
| Season 5 | Episode 2 | Aliens and Cover-Ups | 2012-12-28 | 60 min |
| Season 5 | Episode 3 | Alien Power Plants | 2013-01-04 | 60 min |
| Season 5 | Episode 4 | Destination Orion | 2013-01-11 | 60 min |
| Season 5 | Episode 5 | The Einstein Factor | 2013-01-18 | 60 min |
| Season 5 | Episode 6 | Secrets of the Tombs | 2013-01-25 | 60 min |
| Season 5 | Episode 7 | Prophets and Prophecies | 2013-02-08 | 60 min |
| Season 5 | Episode 8 | Beyond Nazca | 2013-02-15 | 60 min |
| Season 5 | Episode 9 | Strange Abductions | 2013-02-22 | 60 min |
| Season 5 | Episode 10 | The von Däniken Legacy | 2013-04-05 | 60 min |
| Season 5 | Episode 11 | The Viking Gods | 2013-04-12 | 60 min |
| Season 5 | Episode 12 | The Monoliths | 2013-04-19 | 60 min |
| Season 6 | Episode 1 | The Power of Three | 2013-09-30 | 60 min |
| Season 6 | Episode 2 | The Crystal Skulls | 2013-10-07 | 60 min |
| Season 6 | Episode 3 | The Anunnaki Connection | 2013-10-14 | 60 min |
| Season 6 | Episode 4 | Magic of the Gods | 2013-10-21 | 60 min |
| Season 6 | Episode 5 | The Satan Conspiracy | 2013-10-28 | 60 min |
| Season 6 | Episode 6 | Alien Operations | 2013-11-01 | 60 min |
| Season 6 | Episode 7 | Emperors, Kings and Pharaohs | 2013-11-08 | 60 min |
| Season 6 | Episode 8 | Mysterious Relics | 2013-11-15 | 60 min |
| Season 6 | Episode 9 | Aliens and Forbidden Islands | 2013-11-29 | 60 min |
| Season 6 | Episode 10 | Aliens and the Lost Ark | 2013-12-06 | 60 min |
| Season 6 | Episode 11 | Aliens and Mysterious Mountains | 2013-12-13 | 60 min |
| Season 7 | Episode 1 | Aliens and Stargates | 2014-01-24 | 60 min |
| Season 7 | Episode 2 | Aliens in America | 2014-01-31 | 60 min |
| Season 7 | Episode 3 | The Star Children | 2014-02-07 | 60 min |
| Season 7 | Episode 4 | Treasures of the Gods | 2014-02-14 | 60 min |
| Season 7 | Episode 5 | Aliens and the Red Planet | 2014-02-21 | 60 min |
| Season 7 | Episode 6 | The Shamans | 2014-02-28 | 60 min |
| Season 7 | Episode 7 | Aliens and Insects | 2014-03-07 | 60 min |
| Season 7 | Episode 8 | Alien Breeders | 2014-03-14 | 60 min |
| Season 8 | Episode 1 | Alien Transports | 2014-06-13 | 60 min |
| Season 8 | Episode 2 | Mysterious Structures | 2014-06-20 | 60 min |
| Season 8 | Episode 3 | Mysterious Devices | 2014-06-27 | 60 min |
| Season 8 | Episode 4 | Faces of the Gods | 2014-07-25 | 60 min |
| Season 8 | Episode 5 | The Reptilians | 2014-07-25 | 60 min |
| Season 8 | Episode 6 | The Tesla Experiment | 2014-08-01 | 60 min |
| Season 8 | Episode 7 | The God Particle | 2014-08-08 | 60 min |
| Season 8 | Episode 8 | Alien Encounters | 2014-08-15 | 60 min |
| Season 8 | Episode 9 | Aliens & Superheroes | 2014-08-22 | 60 min |
| Season 9 | Episode 1 | Forbidden Caves | 2014-10-31 | 60 min |
| Season 9 | Episode 2 | Mysteries of the Sphinx | 2014-11-07 | 60 min |
| Season 9 | Episode 3 | Aliens Among Us | 2014-11-14 | 60 min |
| Season 9 | Episode 4 | The Genius Factor | 2014-11-21 | 60 min |
| Season 9 | Episode 5 | Secrets of the Mummies | 2014-11-28 | 60 min |
| Season 9 | Episode 6 | Alien Resurrections | 2014-12-05 | 60 min |
| Season 9 | Episode 7 | Alien Messages | 2014-12-19 | 60 min |
| Season 9 | Episode 8 | The Great Flood | 2014-12-23 | 60 min |
| Season 9 | Episode 9 | Aliens and the Civil War | 2015-04-10 | 60 min |
| Season 9 | Episode 10 | Hidden Pyramids | 2015-04-17 | 60 min |
| Season 9 | Episode 11 | The Vanishings | 2015-04-24 | 60 min |
| Season 9 | Episode 12 | The Alien Agenda | 2015-05-01 | 60 min |
| Season 10 | Episode 1 | Aliens B.C. | 2015-07-24 | 60 min |
| Season 10 | Episode 2 | NASA's Secret Agenda | 2015-07-31 | 60 min |
| Season 10 | Episode 3 | Aliens and Robots | 2015-08-07 | 60 min |
| Season 10 | Episode 4 | Dark Forces | 2015-08-14 | 60 min |
| Season 10 | Episode 5 | The Alien Evolution | 2015-08-21 | 60 min |
| Season 10 | Episode 6 | The Other Earth | 2015-08-28 | 60 min |
| Season 10 | Episode 7 | Creatures of the Deep | 2015-09-04 | 60 min |
| Season 10 | Episode 8 | Circles from the Sky | 2015-09-18 | 60 min |
| Season 10 | Episode 9 | The Alien Wars | 2015-10-02 | 63 min |
| Season 10 | Episode 10 | The Forbidden Zones | 2015-10-09 | 60 min |
| Season 11 | Episode 1 | Pyramids of Antarctica | 2016-05-06 | 60 min |
| Season 11 | Episode 2 | Destination Mars | 2016-05-13 | 60 min |
| Season 11 | Episode 3 | The Next Humans | 2016-05-20 | 60 min |
| Season 11 | Episode 4 | The New Evidence | 2016-05-27 | 60 min |
| Season 11 | Episode 5 | The Visionaries | 2016-06-10 | 60 min |
| Season 11 | Episode 6 | Decoding the Cosmic Egg | 2016-06-17 | 60 min |
| Season 11 | Episode 7 | The Wisdom Keepers | 2016-06-24 | 60 min |
| Season 11 | Episode 8 | The Mysterious Nine | 2016-07-08 | 60 min |
| Season 11 | Episode 9 | The Hidden Empire | 2016-07-15 | 60 min |
| Season 11 | Episode 10 | The Prototypes | 2016-07-22 | 60 min |
| Season 11 | Episode 11 | Space Station Moon | 2016-07-29 | 60 min |
| Season 11 | Episode 12 | Russia's Secret Files | 2016-08-12 | 60 min |
| Season 11 | Episode 13 | Beyond Roswell | 2016-08-19 | 60 min |
| Season 11 | Episode 14 | The Returned | 2016-08-26 | 60 min |
| Season 11 | Episode 15 | Shiva the Destroyer | 2016-09-02 | 60 min |
| Season 12 | Episode 1 | The Alien Hunters | 2017-04-28 | 60 min |
| Season 12 | Episode 2 | Forged by the Gods | 2017-05-05 | 63 min |
| Season 12 | Episode 3 | The Mystery of Rudloe Manor | 2017-05-12 | 63 min |
| Season 12 | Episode 4 | The Alien Architects | 2017-05-19 | 60 min |
| Season 12 | Episode 5 | The Pharaohs' Curse | 2017-05-26 | 60 min |
| Season 12 | Episode 6 | The Science Wars | 2017-06-02 | 60 min |
| Season 12 | Episode 7 | City of the Gods | 2017-06-09 | 60 min |
| Season 12 | Episode 8 | The Alien Frequency | 2017-06-16 | 63 min |
| Season 12 | Episode 9 | The Majestic Twelve | 2017-07-07 | 63 min |
| Season 12 | Episode 10 | The Akashic Record | 2017-07-14 | 60 min |
| Season 12 | Episode 11 | Voices of the Gods | 2017-07-21 | 60 min |
| Season 12 | Episode 12 | The Animal Agenda | 2017-07-28 | 60 min |
| Season 12 | Episode 13 | The Replicants | 2017-08-04 | 60 min |
| Season 12 | Episode 14 | A Spaceship Made of Stone | 2017-08-11 | 60 min |
| Season 12 | Episode 15 | The Alien Disks | 2017-09-08 | 60 min |
| Season 12 | Episode 16 | Return to Gobekli Tepe | 2017-09-15 | 60 min |
| Season 13 | Episode 1 | The UFO Conspiracy | 2018-04-27 | 120 min |
| Season 13 | Episode 2 | Da Vinci's Forbidden Codes | 2018-05-04 | 60 min |
| Season 13 | Episode 3 | The Alien Protocols | 2018-05-11 | 60 min |
| Season 13 | Episode 4 | Earth's Black Holes | 2018-05-18 | 60 min |
| Season 13 | Episode 5 | The Desert Codes | 2018-05-25 | 60 min |
| Season 13 | Episode 6 | Area 52 | 2018-06-01 | 60 min |
| Season 13 | Episode 7 | Earth Station Egypt | 2018-07-20 | 120 min |
| Season 13 | Episode 8 | Island of the Giants | 2018-07-27 | 60 min |
| Season 13 | Episode 9 | The Taken | 2018-08-03 | 60 min |
| Season 13 | Episode 10 | The Sentinels | 2018-08-10 | 60 min |
| Season 13 | Episode 11 | Russia Declassified | 2018-08-17 | 60 min |
| Season 13 | Episode 12 | They Came from the Sky | 2018-08-24 | 60 min |
| Season 13 | Episode 13 | The Artificial Human | 2018-08-31 | 120 min |
| Season 13 | Episode 14 | The Alien Phenomenon | 2019-01-04 | 120 min |
| Season 13 | Episode 15 | Return to Mars | 2019-01-07 | 120 min |
| Season 14 | Episode 1 | Return to Antarctica | 2019-05-31 | 60 min |
| Season 14 | Episode 2 | The Badlands Guardian | 2019-06-07 | 60 min |
| Season 14 | Episode 3 | Element 115 | 2019-06-14 | 60 min |
| Season 14 | Episode 4 | The Star Gods of Sirius | 2019-06-21 | 60 min |
| Season 14 | Episode 5 | They Came from the Sea | 2019-06-28 | 60 min |
| Season 14 | Episode 6 | Secrets of the Maya | 2019-07-05 | 60 min |
| Season 14 | Episode 7 | The Druid Connection | 2019-07-19 | 60 min |
| Season 14 | Episode 8 | The Reptilian Agenda | 2019-07-26 | 60 min |
| Season 14 | Episode 9 | The Alien Infection | 2019-08-02 | 60 min |
| Season 14 | Episode 10 | Project Hybrid | 2019-08-09 | 60 min |
| Season 14 | Episode 11 | The Trans-Dimensionals | 2019-08-16 | 60 min |
| Season 14 | Episode 12 | Islands of Fire | 2019-08-23 | 60 min |
| Season 14 | Episode 13 | The Constellation Code | 2019-08-30 | 60 min |
| Season 14 | Episode 14 | The Nuclear Agenda | 2019-09-06 | 60 min |
| Season 14 | Episode 15 | The Alien Mountain | 2019-10-04 | 60 min |
| Season 14 | Episode 16 | The Alien Brain | 2019-10-11 | 60 min |
| Season 14 | Episode 17 | The Secrets of Stonehenge | 2019-10-18 | 60 min |
| Season 14 | Episode 18 | Food of the Gods | 2019-11-01 | 60 min |
| Season 14 | Episode 19 | Human Hieroglyphs | 2019-11-08 | 60 min |
| Season 14 | Episode 20 | The Storming of Area 51 | 2019-11-15 | 60 min |
| Season 14 | Episode 21 | Countdown to Disclosure | 2019-11-22 | 60 min |
| Season 14 | Episode 22 | Secrets of the Exoplanets | 2019-11-29 | 60 min |
| Season 15 | Episode 1 | The Mystery of Nan Madol | 2020-01-25 | 60 min |
| Season 15 | Episode 2 | The Relics of Roswell | 2020-02-01 | 60 min |
| Season 15 | Episode 3 | Destination Chile | 2020-02-08 | 60 min |
| Season 15 | Episode 4 | The Real Men in Black | 2020-02-15 | 60 min |
| Season 15 | Episode 5 | The Mystery of the Stone Giants | 2020-02-22 | 60 min |
| Season 15 | Episode 6 | The World Before Time | 2020-02-29 | 60 min |
| Season 15 | Episode 7 | They Came from the Pleiades | 2020-03-07 | 60 min |
| Season 15 | Episode 8 | The Immortality Machine | 2020-03-14 | 60 min |
| Season 15 | Episode 9 | The Shapeshifters | 2020-03-21 | 60 min |
| Season 15 | Episode 10 | The Mystery of Skinwalker Ranch | 2020-03-28 | 60 min |
| Season 15 | Episode 11 | The Ultimate Guide to UFO's | 2020-04-11 | 60 min |
| Season 15 | Episode 12 | Aliens and the Presidents | 2020-04-18 | 60 min |
| Season 16 | Episode 1 | The Divine Number | 2020-11-13 | 60 min |
| Season 16 | Episode 2 | The Lost Kingdom | 2020-11-20 | 60 min |
| Season 16 | Episode 3 | The Galactic Keyhole | 2020-12-04 | 60 min |
| Season 16 | Episode 4 | Giants of the Mediterranean | 2020-12-11 | 60 min |
| Season 16 | Episode 5 | The Forbidden Bible | 2020-12-18 | 60 min |
| Season 16 | Episode 6 | William Shatner Meets Ancient Aliens | 2021-02-12 | 120 min |
| Season 16 | Episode 7 | Impossible Artifacts | 2021-02-19 | 60 min |
| Season 16 | Episode 8 | The Space Travelers | 2021-02-26 | 60 min |
| Season 16 | Episode 9 | The UFO Pioneers | 2021-03-05 | 60 min |
| Season 16 | Episode 10 | The Harmonic Code | 2021-03-12 | 60 min |
| Season 17 | Episode 1 | The Lost City of Peru | 2021-08-06 | 63 min |
| Season 17 | Episode 2 | Top Ten Mysterious Sites | 2021-08-13 | 60 min |
| Season 17 | Episode 3 | Top Ten Alien Cover-Ups | 2021-08-20 | 60 min |
| Season 17 | Episode 4 | The Mystery of Mount Shasta | 2021-09-17 | 60 min |
| Season 17 | Episode 5 | The Human Experiment | 2021-09-24 | 60 min |
| Season 17 | Episode 6 | Top Ten Alien Encounters | 2021-10-01 | 60 min |
| Season 17 | Episode 7 | Top Ten Alien Artifacts | 2021-10-08 | 60 min |
| Season 18 | Episode 1 | The Disclosure Event | 2022-01-07 | 60 min |
| Season 18 | Episode 2 | Mystery of the Standing Stones | 2022-01-14 | 60 min |
| Season 18 | Episode 3 | Beneath the Sacred Temples | 2022-01-21 | 60 min |
| Season 18 | Episode 4 | The World on Alert | 2022-01-28 | 60 min |
| Season 18 | Episode 5 | Recovering the Ark of the Covenant | 2022-02-11 | 60 min |
| Season 18 | Episode 6 | Secrets of the Star Ancestors | 2022-02-18 | 60 min |
| Season 18 | Episode 7 | Alien Air Force | 2022-02-25 | 60 min |
| Season 18 | Episode 8 | The Shadow People | 2022-03-04 | 60 min |
| Season 18 | Episode 9 | Decoding the Dragon Gods | 2022-03-11 | 60 min |
| Season 18 | Episode 10 | The Time Benders | 2022-03-18 | 60 min |
| Season 18 | Episode 11 | Ancient Aliens On Location: Incredible Structures | 2022-07-08 | 60 min |
| Season 18 | Episode 12 | Ancient Aliens On Location: Extraordinary Encounters | 2022-07-15 | 60 min |
| Season 18 | Episode 13 | Ancient Aliens On Location: Decoding The Alien Glyphs | 2022-07-22 | 60 min |
| Season 18 | Episode 14 | Ancient Aliens On Location: The UFO Investigations | 2022-07-29 | 60 min |
| Season 18 | Episode 15 | Ancient Aliens On Location: Mysterious Artifacts | 2022-08-05 | 60 min |
| Season 18 | Episode 16 | Ancient Aliens On Location: Evidence of Alien Life | 2022-08-12 | 60 min |
| Season 18 | Episode 17 | The Shining Ones | 2022-08-19 | 60 min |
| Season 18 | Episode 18 | The Journey to Immortality | 2022-08-26 | 60 min |
| Season 18 | Episode 19 | Secrets of Inner Earth | 2022-09-09 | 60 min |
| Season 18 | Episode 20 | Return of the Egyptian Gods | 2022-09-16 | 60 min |
| Season 19 | Episode 1 | The Hotspots Connection | 2023-01-06 | 60 min |
| Season 19 | Episode 2 | The Crop Circle Code | 2023-01-13 | 60 min |
| Season 19 | Episode 3 | Mystery of the Lost Civilization | 2023-01-20 | 60 min |
| Season 19 | Episode 4 | The Power of the Obelisks | 2023-02-03 | 60 min |
| Season 19 | Episode 5 | The MUFON Files | 2023-02-10 | 60 min |
| Season 19 | Episode 6 | Cosmic Impacts | 2023-02-17 | 60 min |
| Season 19 | Episode 7 | Close Encounters of the Fifth Kind | 2023-02-24 | 60 min |
| Season 19 | Episode 8 | The Mysteries of Alaska | 2023-03-03 | 60 min |
| Season 19 | Episode 9 | Aliens in our Airspace | 2023-03-10 | 60 min |
| Season 19 | Episode 10 | The Giants of Malta | 2023-03-17 | 60 min |
| Season 19 | Episode 11 | The Top Ten Pyramid Sites | 2023-06-30 | 60 min |
| Season 19 | Episode 12 | The Top Ten Mysterious Devices | 2023-07-07 | 60 min |
| Season 19 | Episode 13 | The Top Ten Mysterious Islands | 2023-07-14 | 60 min |
| Season 19 | Episode 14 | The Top Ten Alien Craft | 2023-07-21 | 60 min |
| Season 19 | Episode 15 | Edgar Cayce: The Sleeping Prophet | 2023-08-04 | 60 min |
| Season 19 | Episode 16 | The Gods of Greece | 2023-08-11 | 60 min |
| Season 19 | Episode 17 | The New UFO Hunters | 2023-08-18 | 60 min |
| Season 19 | Episode 18 | Power of the Talisman | 2023-08-25 | 60 min |
| Season 19 | Episode 19 | The Top Ten Mysteries of the Deep | 2023-09-08 | 60 min |
| Season 19 | Episode 20 | The Top Ten Alien Petroglyphs | 2023-09-15 | 60 min |
| Season 20 | Episode 1 | The Top Ten Alien Influencers | 2024-01-05 | 60 min |
| Season 20 | Episode 2 | The Top Ten Extraordinary Creatures | 2024-01-12 | 60 min |
| Season 20 | Episode 3 | The Top Ten Hidden Alien Bases | 2024-01-19 | 60 min |
| Season 20 | Episode 4 | The Top Ten Scariest Encounters | 2024-02-02 | 60 min |
| Season 20 | Episode 5 | The Top Ten Alien Codes | 2024-02-09 | 60 min |
| Season 20 | Episode 6 | The Top Ten Alien Disasters | 2024-02-16 | 60 min |
| Season 20 | Episode 7 | Secrets of the Sumerians | 2024-02-23 | 60 min |
| Season 20 | Episode 8 | The UFO Superhighway | 2024-03-01 | 60 min |
| Season 20 | Episode 9 | Mysteries of Scotland | 2024-03-08 | 60 min |
| Season 20 | Episode 10 | Mystery of the Stone Spheres | 2024-03-15 | 60 min |
