| episode | air date | countdown | title |
| S20E20 | 2024-09-13 | | Resurrecting Puma Punku | |
| S20E19 | 2024-09-06 | | The Chosen | |
| S20E18 | 2024-08-30 | | The Linda Moulton Howe Files | |
| S20E17 | 2024-08-23 | | Egypt's Giant Tombs | |
| S20E16 | 2024-08-16 | | The Teachers | |
| S20E15 | 2024-08-09 | | Jacques Vallée: UFO Pioneer | |
| S20E14 | 2024-07-19 | | The Search For Extraterrestrial Intelligence | |
| S20E13 | 2024-07-12 | | The Whistleblowers | |
| S20E12 | 2024-07-05 | | Unlocking the Stargates | |
| S20E11 | 2024-06-28 | | Mysteries of the Maya | |
| S20E10 | 2024-03-15 | | Mystery of the Stone Spheres | |
| S20E09 | 2024-03-08 | | Mysteries of Scotland | |
| S20E08 | 2024-03-01 | | The UFO Superhighway | |
| S20E07 | 2024-02-23 | | Secrets of the Sumerians | |
| S20E06 | 2024-02-16 | | The Top Ten Alien Disasters | |
| S20E05 | 2024-02-09 | | The Top Ten Alien Codes | |
| S20E04 | 2024-02-02 | | The Top Ten Scariest Encounters | |
| S20E03 | 2024-01-19 | | The Top Ten Hidden Alien Bases | |
| S20E02 | 2024-01-12 | | The Top Ten Extraordinary Creatures | |
| S20E01 | 2024-01-05 | | The Top Ten Alien Influencers | |
|
| |
| S19E20 | 2023-09-15 | | The Top Ten Alien Petroglyphs | |
| S19E19 | 2023-09-08 | | The Top Ten Mysteries of the Deep | |
| S19E18 | 2023-08-25 | | Power of the Talisman | |
| S19E17 | 2023-08-18 | | The New UFO Hunters | |
| S19E16 | 2023-08-11 | | The Gods of Greece | |
| S19E15 | 2023-08-04 | | Edgar Cayce: The Sleeping Prophet | |
| S19E14 | 2023-07-21 | | The Top Ten Alien Craft | |
| S19E13 | 2023-07-14 | | The Top Ten Mysterious Islands | |
| S19E12 | 2023-07-07 | | The Top Ten Mysterious Devices | |
| S19E11 | 2023-06-30 | | The Top Ten Pyramid Sites | |
| S19E10 | 2023-03-17 | | The Giants of Malta | |
| S19E09 | 2023-03-10 | | Aliens in Our Airspace | |
| S19E08 | 2023-03-03 | | The Mysteries of Alaska | |
| S19E07 | 2023-02-24 | | Close Encounters of the Fifth Kind | |
| S19E06 | 2023-02-17 | | Cosmic Impacts | |
| S19E05 | 2023-02-10 | | The MUFON Files | |
| S19E04 | 2023-02-03 | | The Power of the Obelisks | |
| S19E03 | 2023-01-20 | | Mystery of the Lost Civilization | |
| S19E02 | 2023-01-13 | | The Crop Circle Code | |
| S19E01 | 2023-01-06 | | UFO Hotspots | |
|
| |
| S18E20 | 2022-09-16 | | Return of the Egyptian Gods | |
| S18E19 | 2022-09-09 | | Secrets of Inner Earth | |
| S18E18 | 2022-08-26 | | The Journey to Immortality | |
| S18E17 | 2022-08-19 | | The Shining Ones | |
| S18E16 | 2022-08-12 | | Ancient Aliens on Location: Evidence of Alien | |
| S18E15 | 2022-08-05 | | Ancient Aliens on Location: Mysterious Artifac | |
| S18E14 | 2022-07-29 | | Ancient Aliens on Location: The UFO Investigat | |
| S18E13 | 2022-07-22 | | Ancient Aliens on Location: Decoding the Alien | |
| S18E12 | 2022-07-15 | | Ancient Aliens on Location: Extraordinary Enco | |
| S18E11 | 2022-07-08 | | Ancient Aliens on Location: Incredible Structu | |
| S18E10 | 2022-03-18 | | The Time Benders | |
| S18E09 | 2022-03-11 | | Decoding the Dragon Gods | |
| S18E08 | 2022-03-04 | | The Shadow People | |
| S18E07 | 2022-02-25 | | Alien Air Force | |
| S18E06 | 2022-02-18 | | Secrets of the Star Ancestors | |
| S18E05 | 2022-02-11 | | Recovering the Ark of the Covenant | |
| S18E04 | 2022-01-28 | | The World on Alert | |
| S18E03 | 2022-01-21 | | Beneath the Sacred Temples | |
| S18E02 | 2022-01-14 | | Mystery of the Standing Stones | |
| S18E01 | 2022-01-07 | | The Disclosure Event | |
| |
| S17E07 | 2021-10-08 | | Top Ten Alien Artifacts | |
| S17E06 | 2021-10-01 | | Top Ten Alien Encounters | |
| S17E05 | 2021-09-24 | | The Human Experiment | |
| S17E04 | 2021-09-17 | | The Mystery of Mount Shasta | |
| S17E03 | 2021-08-20 | | Top Ten Alien Cover-Ups | |
| S17E02 | 2021-08-13 | | Top 10 Mysterious Sites | |
| S17E01 | 2021-08-06 | | The Lost City of Peru | |
| |
| S16E10 | 2021-03-12 | | The Harmonic Code | |
| S16E09 | 2021-03-05 | | The UFO Pioneers | |
| S16E08 | 2021-02-26 | | The Space Travelers | |
| S16E07 | 2021-02-19 | | Impossible Artifacts | |
| S16E06 | 2021-02-12 | | William Shatner Meets Ancient Aliens | |
| S16E05 | 2020-12-18 | | The Forbidden Bible | |
| S16E04 | 2020-12-11 | | Giants of the Mediterranean | |
| S16E03 | 2020-12-04 | | The Galactic Keyhole | |
| S16E02 | 2020-11-20 | | The Lost Kingdom | |
| S16E01 | 2020-11-13 | | The Divine Number | |
| |
| S15E12 | 2020-04-18 | | Aliens and the Presidents | |
| S15E11 | 2020-04-11 | | The Ultimate Guide to UFOs | |
| S15E10 | 2020-03-28 | | The Mystery of Skinwalker Ranch | |
| S15E09 | 2020-03-21 | | The Shapeshifters | |
| S15E08 | 2020-03-14 | | The Immortality Machine | |
| S15E07 | 2020-03-07 | | They Came from The Pleiades | |
| S15E06 | 2020-02-29 | | The World Before Time | |
| S15E05 | 2020-02-22 | | The Mystery of the Stone Giants | |
| S15E04 | 2020-02-15 | | The Real Men in Black | |
| S15E03 | 2020-02-08 | | Destination Chile | |
| S15E02 | 2020-02-01 | | The Relics of Roswell | |
| S15E01 | 2020-01-25 | | The Mystery of Nan Madol | |
| |
| S14E22 | 2019-11-29 | | Secrets of the Exoplanets | |
| S14E21 | 2019-11-22 | | Countdown to Disclosure | |
| S14E20 | 2019-11-15 | | The Storming of Area 51 | |
| S14E19 | 2019-11-08 | | Human Hieroglyphs | |
| S14E18 | 2019-11-01 | | Food of the Gods | |
| S14E17 | 2019-10-18 | | The Secrets of Stonehenge | |
| S14E16 | 2019-10-11 | | The Alien Brain | |
| S14E15 | 2019-10-04 | | The Alien Mountain | |
| S14E14 | 2019-09-06 | | The Nuclear Agenda | |
| S14E13 | 2019-08-30 | | The Constellation Code | |
| S14E12 | 2019-08-23 | | Islands of Fire | |
| S14E11 | 2019-08-16 | | The Trans-Dimensionals | |
| S14E10 | 2019-08-09 | | Project Hybrid | |
| S14E09 | 2019-08-02 | | The Alien Infection | |
| S14E08 | 2019-07-26 | | The Reptilian Agenda | |
| S14E07 | 2019-07-19 | | The Druid Connection | |
| S14E06 | 2019-07-05 | | Secrets of the Maya | |
| S14E05 | 2019-06-28 | | They Came from the Sea | |
| S14E04 | 2019-06-21 | | The Star Gods of Sirius | |
| S14E03 | 2019-06-14 | | Element 115 | |
| S14E02 | 2019-06-07 | | The Badlands Guardian | |
| S14E01 | 2019-05-31 | | Return to Antarctica | |
| |
| S13E15 | 2019-01-07 | | Return to Mars | |
| S13E14 | 2019-01-04 | | The Alien Phenomenon | |
| S13E13 | 2018-08-31 | | The Artificial Human | |
| S13E12 | 2018-08-24 | | They Came from the Sky | |
| S13E11 | 2018-08-17 | | Russia Declassified | |
| S13E10 | 2018-08-10 | | The Sentinels | |
| S13E09 | 2018-08-03 | | The Taken | |
| S13E08 | 2018-07-27 | | Island of the Giants | |
| S13E07 | 2018-07-20 | | Earth Station Egypt | |
| S13E06 | 2018-06-01 | | Area 52 | |
| S13E05 | 2018-05-25 | | The Desert Codes | |
| S13E04 | 2018-05-18 | | Earth's Black Holes | |
| S13E03 | 2018-05-11 | | The Alien Protocols | |
| S13E02 | 2018-05-04 | | Da Vinci's Forbidden Codes | |
| S13E01 | 2018-04-27 | | The UFO Conspiracy | |
| |
| S12E16 | 2017-09-15 | | Return to Gobekli Tepe | |
| S12E15 | 2017-09-08 | | The Alien Disks | |
| S12E14 | 2017-08-11 | | A Spaceship Made of Stone | |
| S12E13 | 2017-08-04 | | The Replicants | |
| S12E12 | 2017-07-28 | | The Animal Agenda | |
| S12E11 | 2017-07-21 | | Voices of the Gods | |
| S12E10 | 2017-07-14 | | The Akashic Record | |
| S12E09 | 2017-07-07 | | The Majestic Twelve | |
| S12E08 | 2017-06-16 | | The Alien Frequency | |
| S12E07 | 2017-06-09 | | City of the Gods | |
| S12E06 | 2017-06-02 | | The Science Wars | |
| S12E05 | 2017-05-26 | | The Pharaohs' Curse | |
| S12E04 | 2017-05-19 | | The Alien Architects | |
| S12E03 | 2017-05-12 | | The Mystery of Rudloe Manor | |
| S12E02 | 2017-05-05 | | Forged by the Gods | |
| S12E01 | 2017-04-28 | | Alien Hunters | |
| |
| S11E15 | 2016-09-02 | | Shiva the Destroyer | |
| S11E14 | 2016-08-26 | | The Returned | |
| S11E13 | 2016-08-19 | | Beyond Roswell | |
| S11E12 | 2016-08-12 | | Russia's Secret Files | |
| S11E11 | 2016-07-29 | | Space Station Moon | |
| S11E10 | 2016-07-22 | | The Prototypes | |
| S11E09 | 2016-07-15 | | The Hidden Empire | |
| S11E08 | 2016-07-08 | | The Mysterious Nine | |
| S11E07 | 2016-06-24 | | The Wisdom Keepers | |
| S11E06 | 2016-06-17 | | Decoding the Cosmic Egg | |
| S11E05 | 2016-06-10 | | The Visionaries | |
| S11E04 | 2016-05-27 | | The New Evidence | |
| S11E03 | 2016-05-20 | | The Next Humans | |
| S11E02 | 2016-05-13 | | Destination Mars | |
| S11E01 | 2016-05-06 | | Pyramids of Antarctica | |
| |
| S08E10 | 2015-10-09 | | The Forbidden Zones | |
| S08E09 | 2015-10-02 | | Alien Wars | |
| S08E08 | 2015-09-18 | | Circles from the Sky | |
| S08E07 | 2015-09-04 | | Creatures of the Deep | |
| S08E06 | 2015-08-28 | | The Other Earth | |
| S08E05 | 2015-08-21 | | Alien Evolution | |
| S08E04 | 2015-08-14 | | Dark Forces | |
| S08E03 | 2015-08-07 | | Aliens and Robots | |
| S08E02 | 2015-07-31 | | NASA's Secret Agenda | |
| S08E01 | 2015-07-24 | | Aliens B.C. | |
| |
| S07E12 | 2015-05-01 | | The Alien Agenda | |
| S07E11 | 2015-04-24 | | The Vanishings | |
| S07E10 | 2015-04-17 | | Hidden Pyramids | |
| S07E09 | 2015-04-10 | | Aliens and the Civil War | |
| S07E08 | 2014-12-23 | | The Great Flood | |
| S07E07 | 2014-12-19 | | Alien Messages | |
| S07E06 | 2014-12-05 | | Alien Resurrections | |
| S07E05 | 2014-11-28 | | Secrets of the Mummies | |
| S07E04 | 2014-11-21 | | The Genius Factor | |
| S07E03 | 2014-11-14 | | Aliens Among Us | |
| S07E02 | 2014-11-07 | | Mysteries of the Sphinx | |
| S07E01 | 2014-10-21 | | Forbidden Caves | |
| |
| S06E19 | 2014-08-22 | | Aliens and Superheroes | |
| S06E18 | 2014-08-15 | | Alien Encounters | |
| S06E17 | 2014-08-08 | | The God Particle | |
| S06E16 | 2014-08-01 | | The Tesla Experiment | |
| S06E15 | 2014-07-25 | | The Reptilians | |
| S06E14 | 2014-06-27 | | Mysterious Devices | |
| S06E13 | 2014-06-20 | | Mysterious Structures | |
| S06E12 | 2014-06-13 | | Alien Transports | |
| S06E11 | 2014-03-14 | | Alien Breeders | |
| S06E10 | 2014-03-07 | | Aliens and Insects | |
| S06E09 | 2014-02-28 | | The Shamans | |
| S06E08 | 2014-02-21 | | Aliens and the Red Planet | |
| S06E07 | 2014-02-14 | | Treasures of the Gods | |
| S06E06 | 2014-02-07 | | The Star Children | |
| S06E05 | 2014-01-31 | | Aliens in America | |
| S06E04 | 2014-01-24 | | Aliens and Stargates | |
| S06E03 | 2013-12-13 | | Aliens and Mysterious Mountains | |
| S06E02 | 2013-12-06 | | Aliens and The Lost Ark | |
| S06E01 | 2013-11-29 | | Aliens and Forbidden Islands | |
| |
| S05E15 | 2013-11-16 | | Mysterious Relics | |
| S05E14 | 2013-11-08 | | Emperors, Kings and Pharaohs | |
| S05E13 | 2013-11-05 | | Alien Operations | |
| S05E12 | 2013-10-28 | | The Satan Conspiracy | |
| S05E11 | 2013-10-21 | | Magic of the Gods | |
| S05E10 | 2013-10-14 | | The Anunnaki Connection | |
| S05E09 | 2013-10-07 | | The Crystal Skulls | |
| S05E08 | 2013-09-30 | | The Power of Three | |
| S05E07 | 2013-03-18 | | The Monoliths | |
| S05E06 | 2013-03-12 | | The Viking Gods | |
| S05E05 | 2013-03-05 | | The von Daniken Legacy | |
| S05E04 | 2013-02-22 | | Strange Abductions | |
| S05E03 | 2013-02-15 | | Beyond Nazca | |
| S05E02 | 2013-02-08 | | Prophets and Prophecies | |
| S05E01 | 2013-01-25 | | Secrets of the Tombs | |
| |
| S04E15 | 2013-01-18 | | The Einstein Factor | |
| S04E14 | 2013-01-11 | | Destination Orion | |
| S04E13 | 2013-01-04 | | Alien Power Plants | |
| S04E12 | 2012-12-28 | | Aliens and Cover-Ups | |
| S04E11 | 2012-12-21 | | Secrets of the Pyramids | |
| S04E10 | 2012-05-04 | | Aliens and Dinosaurs | |
| S04E09 | 2012-04-27 | | The Time Travelers | |
| S04E08 | 2012-04-06 | | The Da Vinci Conspiracy | |
| S04E07 | 2012-03-23 | | Aliens and Bigfoot | |
| S04E06 | 2012-03-16 | | The Mystery of Puma Punku | |
| S04E05 | 2012-03-09 | | The NASA Connection | |
| S04E04 | 2012-03-02 | | Aliens and Mega-Disasters | |
| S04E03 | 2012-02-24 | | The Greys | |
| S04E02 | 2012-02-17 | | The Doomsday Prophecies | |
| S04E01 | 2012-02-17 | | The Mayan Conspiracy | |
| |
| S03E16 | 2011-11-23 | | Aliens and the Creation of Man | |
| S03E15 | 2011-11-16 | | Aliens, Gods and Heroes | |
| S03E14 | 2011-10-26 | | Aliens and the Undead | |
| S03E13 | 2011-10-19 | | Aliens and the Secret Code | |
| S03E12 | 2011-10-12 | | Aliens and Deadly Cults | |
| S03E11 | 2011-10-05 | | Aliens and the Founding Fathers | |
| S03E10 | 2011-09-28 | | Aliens and Evil Places | |
| S03E09 | 2011-09-22 | | Aliens and Deadly Weapons | |
| S03E08 | 2011-09-15 | | Aliens and Lost Worlds | |
| S03E07 | 2011-09-08 | | Aliens, Plagues and Epidemics | |
| S03E06 | 2011-09-01 | | Aliens and Ancient Engineers | |
| S03E05 | 2011-08-25 | | Aliens and Mysterious Rituals | |
| S03E04 | 2011-08-18 | | Aliens and Temples of Gold | |
| S03E03 | 2011-08-11 | | Aliens and Sacred Places | |
| S03E02 | 2011-08-04 | | Aliens and Monsters | |
| S03E01 | 2011-07-28 | | Aliens and the Old West | |
| |
| S02E10 | 2010-12-30 | | Alien Contacts | |
| S02E09 | 2010-12-23 | | Alien Devastations | |
| S02E08 | 2010-12-16 | | Unexplained Structures | |
| S02E07 | 2010-12-09 | | Angels and Aliens | |
| S02E06 | 2010-12-02 | | Alien Tech | |
| S02E05 | 2010-11-25 | | Aliens and the Third Reich | |
| S02E04 | 2010-11-18 | | Underground Aliens | |
| S02E03 | 2010-11-11 | | Underwater Worlds | |
| S02E02 | 2010-11-04 | | Gods & Aliens | |
| S02E01 | 2010-10-28 | | Mysterious Places | |
| |
| S01E05 | 2010-05-25 | | The Return | |
| S01E04 | 2010-05-18 | | Closer Encounters | |
| S01E03 | 2010-05-04 | | The Mission | |
| S01E02 | 2010-04-27 | | The Visitors | |
| S01E01 | 2010-04-20 | | The Evidence | |
