S13E15: Return to Mars
An examination of possible encounters humans could have once colonies are established beyond Earth.
Previous Episode 
Season 1
The Evidence
S1E1 / 20 Apr 2010
The Visitors
S1E2 / 27 Apr 2010
The Mission
S1E3 / 04 May 2010
Closer Encounters
S1E4 / 18 May 2010
The Return
S1E5 / 25 May 2010
Season 2
Mysterious Places
S2E1 / 28 Oct 2010
Gods & Aliens
S2E2 / 04 Nov 2010
Underwater Worlds
S2E3 / 11 Nov 2010
Underground Aliens
S2E4 / 18 Nov 2010
Aliens and the Third Reich
S2E5 / 25 Nov 2010
Alien Tech
S2E6 / 02 Dec 2010
Angels and Aliens
S2E7 / 09 Dec 2010
Unexplained Structures
S2E8 / 16 Dec 2010
Alien Devastations
S2E9 / 23 Dec 2010
Alien Contacts
S2E10 / 30 Dec 2010
Season 3
Aliens and the Old West
S3E1 / 28 Jul 2011
Aliens and Monsters
S3E2 / 04 Aug 2011
Aliens and Sacred Places
S3E3 / 11 Aug 2011
Aliens and Temples of Gold
S3E4 / 18 Aug 2011
Aliens and Mysterious Rituals
S3E5 / 25 Aug 2011
Aliens and Ancient Engineers
S3E6 / 01 Sep 2011
Aliens, Plagues and Epidemics
S3E7 / 08 Sep 2011
Aliens and Lost Worlds
S3E8 / 15 Sep 2011
Aliens and Deadly Weapons
S3E9 / 22 Sep 2011
Aliens and Evil Places
S3E10 / 28 Sep 2011
Aliens and the Founding Fathers
S3E11 / 05 Oct 2011
Aliens and Deadly Cults
S3E12 / 12 Oct 2011
Aliens and the Secret Code
S3E13 / 19 Oct 2011
Aliens and the Undead
S3E14 / 26 Oct 2011
Aliens, Gods and Heroes
S3E15 / 16 Nov 2011
Aliens and the Creation of Man
S3E16 / 23 Nov 2011
Season 4
The Mayan Conspiracy
S4E1 / 17 Feb 2012
The Doomsday Prophecies
S4E2 / 17 Feb 2012
The Greys
S4E3 / 24 Feb 2012
Aliens and Mega-Disasters
S4E4 / 02 Mar 2012
The NASA Connection
S4E5 / 09 Mar 2012
The Mystery of Puma Punku
S4E6 / 16 Mar 2012
Aliens and Bigfoot
S4E7 / 23 Mar 2012
The Da Vinci Conspiracy
S4E8 / 06 Apr 2012
The Time Travelers
S4E9 / 27 Apr 2012
Aliens and Dinosaurs
S4E10 / 04 May 2012
Season 5
Secrets of the Pyramids
S5E1 / 21 Dec 2012
Aliens and Cover-Ups
S5E2 / 28 Dec 2012
Alien Power Plants
S5E3 / 04 Jan 2013
Destination Orion
S5E4 / 11 Jan 2013
The Einstein Factor
S5E5 / 18 Jan 2013
Secrets of the Tombs
S5E6 / 25 Jan 2013
Prophets and Prophecies
S5E7 / 08 Feb 2013
Beyond Nazca
S5E8 / 15 Feb 2013
Strange Abductions
S5E9 / 22 Feb 2013
The Von Daniken Legacy
S5E10 / 05 Apr 2013
The Viking Gods
S5E11 / 12 Apr 2013
The Monoliths
S5E12 / 19 Apr 2013
Season 6
The Power of Three
S6E1 / 30 Sep 2013
The Crystal Skulls
S6E2 / 07 Oct 2013
The Anunnaki Connection
S6E3 / 14 Oct 2013
Magic of the Gods
S6E4 / 21 Oct 2013
The Satan Conspiracy
S6E5 / 28 Oct 2013
Alien Operations
S6E6 / 01 Nov 2013
Emperors, Kings and Pharaohs
S6E7 / 08 Nov 2013
Mysterious Relics
S6E8 / 15 Nov 2013
Aliens and Forbidden Islands
S6E9 / 29 Nov 2013
Aliens and The Lost Ark
S6E10 / 06 Dec 2013
Aliens and Mysterious Mountains
S6E11 / 13 Dec 2013
Season 7
Aliens and Stargates
S7E1 / 24 Jan 2014
Aliens in America
S7E2 / 31 Jan 2014
The Star Children
S7E3 / 07 Feb 2014
Treasures of the Gods
S7E4 / 14 Feb 2014
Aliens and the Red Planet
S7E5 / 21 Feb 2014
The Shamans
S7E6 / 28 Feb 2014
Aliens and Insects
S7E7 / 07 Mar 2014
Alien Breeders
S7E8 / 14 Mar 2014
Season 8
Alien Transports
S8E1 / 13 Jun 2014
Mysterious Structures
S8E2 / 20 Jun 2014
Mysterious Devices
S8E3 / 27 Jun 2014
The Reptilians
S8E4 / 25 Jul 2014
The Tesla Experiment
S8E5 / 01 Aug 2014
The God Particle
S8E6 / 08 Aug 2014
Alien Encounters
S8E7 / 15 Aug 2014
Aliens & Superheroes
S8E8 / 22 Aug 2014
Season 9
Forbidden Caves
S9E1 / 31 Oct 2014
Mysteries of the Sphinx
S9E2 / 07 Nov 2014
Aliens Among Us
S9E3 / 14 Nov 2014
The Genius Factor
S9E4 / 21 Nov 2014
Secrets of the Mummies
S9E5 / 28 Nov 2014
Alien Resurrections
S9E6 / 05 Dec 2014
Alien Messages
S9E7 / 19 Dec 2014
The Great Flood
S9E8 / 23 Dec 2014
Aliens and the Civil War
S9E9 / 10 Apr 2015
Hidden Pyramids
S9E10 / 17 Apr 2015
The Vanishings
S9E11 / 24 Apr 2015
The Alien Agenda
S9E12 / 01 May 2015
Season 10
Aliens B.C.
S10E1 / 24 Jul 2015
NASA's Secret Agenda
S10E2 / 31 Jul 2015
Aliens and Robots
S10E3 / 07 Aug 2015
Dark Forces
S10E4 / 14 Aug 2015
The Alien Evolution
S10E5 / 21 Aug 2015
The Other Earth
S10E6 / 28 Aug 2015
Creatures of the Deep
S10E7 / 04 Sep 2015
Circles from the Sky
S10E8 / 18 Sep 2015
The Alien Wars
S10E9 / 02 Oct 2015
The Forbidden Zones
S10E10 / 09 Oct 2015
Season 11
Pyramids of Antarctica
S11E1 / 06 May 2016
Destination Mars
S11E2 / 13 May 2016
The Next Humans
S11E3 / 20 May 2016
The New Evidence
S11E4 / 27 May 2016
The Visionaries
S11E5 / 10 Jun 2016
Decoding the Cosmic Egg
S11E6 / 17 Jun 2016
The Wisdom Keepers
S11E7 / 24 Jun 2016
The Mysterious Nine
S11E8 / 08 Jul 2016
The Hidden Empire
S11E9 / 15 Jul 2016
The Prototypes
S11E10 / 22 Jul 2016
Space Station Moon
S11E11 / 29 Jul 2016
Russia's Secret Files
S11E12 / 12 Aug 2016
Beyond Roswell
S11E13 / 19 Aug 2016
The Returned
S11E14 / 26 Aug 2016
Shiva the Destroyer
S11E15 / 02 Sep 2016
Season 12
The Alien Hunters
S12E1 / 28 Apr 2017
Forged by the Gods
S12E2 / 05 May 2017
The Mystery of Rudloe Manor
S12E3 / 12 May 2017
The Alien Architects
S12E4 / 19 May 2017
The Pharaohs' Curse
S12E5 / 26 May 2017
The Science Wars
S12E6 / 02 Jun 2017
City of the Gods
S12E7 / 09 Jun 2017
The Alien Frequency
S12E8 / 16 Jun 2017
The Majestic Twelve
S12E9 / 07 Jul 2017
The Akashic Record
S12E10 / 14 Jul 2017
Voices of the Gods
S12E11 / 21 Jul 2017
The Animal Agenda
S12E12 / 28 Jul 2017
The Replicants
S12E13 / 04 Aug 2017
A Spaceship Made of Stone
S12E14 / 11 Aug 2017
The Alien Disks
S12E15 / 08 Sep 2017
Return to Gobekli Tepe
S12E16 / 15 Sep 2017
Season 13
The UFO Conspiracy
S13E1 / 27 Apr 2018
Da Vinci's Forbidden Codes
S13E2 / 04 May 2018
The Alien Protocols
S13E3 / 11 May 2018
Earth's Black Holes
S13E4 / 18 May 2018
The Desert Codes
S13E5 / 25 May 2018
Area 52
S13E6 / 01 Jun 2018
Earth Station Egypt
S13E7 / 20 Jul 2018
Island of the Giants
S13E8 / 27 Jul 2018
The Taken
S13E9 / 03 Aug 2018
The Sentinels
S13E10 / 10 Aug 2018
Russia Declassified
S13E11 / 17 Aug 2018
They Came from the Sky
S13E12 / 24 Aug 2018
The Artificial Human
S13E13 / 31 Aug 2018
The Alien Phenomenon
S13E14 / 04 Jan 2019
Return to Mars
S13E15 / 07 Jan 2019
Season 14
Return to Antarctica
S14E1 / 31 May 2019
The Badlands Guardian
S14E2 / 07 Jun 2019
Element 115
S14E3 / 14 Jun 2019
The Star Gods of Sirius
S14E4 / 21 Jun 2019
They Came from the Sea
S14E5 / 28 Jun 2019
Secrets of the Maya
S14E6 / 05 Jul 2019
The Druid Connection
S14E7 / 19 Jul 2019
The Reptilian Agenda
S14E8 / 26 Jul 2019
The Alien Infection
S14E9 / 02 Aug 2019
Project Hybrid
S14E10 / 09 Aug 2019
The Trans-Dimensionals
S14E11 / 16 Aug 2019
Islands of Fire
S14E12 / 23 Aug 2019
The Constellation Code
S14E13 / 30 Aug 2019
The Nuclear Agenda
S14E14 / 06 Sep 2019
The Alien Mountain
S14E15 / 04 Oct 2019
The Alien Brain
S14E16 / 11 Oct 2019
The Secrets of Stonehenge
S14E17 / 18 Oct 2019
Food of the Gods
S14E18 / 01 Nov 2019
Human Hieroglyphs
S14E19 / 08 Nov 2019
The Storming of Area 51
S14E20 / 15 Nov 2019
Countdown to Disclosure
S14E21 / 22 Nov 2019
Secrets of the Exoplanets
S14E22 / 29 Nov 2019
Season 15
The Mystery of Nan Madol
S15E1 / 25 Jan 2020
The Relics of Roswell
S15E2 / 01 Feb 2020
Destination Chile
S15E3 / 08 Feb 2020
The Real Men in Black
S15E4 / 15 Feb 2020
The Mystery of the Stone Giants
S15E5 / 22 Feb 2020
The World Before Time
S15E6 / 29 Feb 2020
They Came from The Pleiades
S15E7 / 07 Mar 2020
The Immortality Machine
S15E8 / 14 Mar 2020
The Shapeshifters
S15E9 / 21 Mar 2020
The Mystery of Skinwalker Ranch
S15E10 / 28 Mar 2020
The Ultimate Guide to UFOs
S15E11 / 11 Apr 2020
Aliens and the Presidents
S15E12 / 18 Apr 2020
Season 16
The Divine Number
S16E1 / 13 Nov 2020
The Lost Kingdom
S16E2 / 20 Nov 2020
The Galactic Keyhole
S16E3 / 04 Dec 2020
Giants of the Mediterranean
S16E4 / 11 Dec 2020
The Forbidden Bible
S16E5 / 18 Dec 2020
William Shatner Meets Ancient Aliens
S16E6 / 12 Feb 2021
Impossible Artifacts
S16E7 / 19 Feb 2021
The Space Travelers
S16E8 / 26 Feb 2021
The UFO Pioneers
S16E9 / 05 Mar 2021
The Harmonic Code
S16E10 / 12 Mar 2021
Season 17
The Lost City of Peru
S17E1 / 06 Aug 2021
Top Ten Mysterious Sites
S17E2 / 13 Aug 2021
Top Ten Alien Cover-Ups
S17E3 / 20 Aug 2021
The Mystery of Mount Shasta
S17E4 / 17 Sep 2021
The Human Experiment
S17E5 / 24 Sep 2021
Top Ten Alien Encounters
S17E6 / 01 Oct 2021
Top Ten Alien Artifacts
S17E7 / 08 Oct 2021
Season 18
The Disclosure Event
S18E1 / 07 Jan 2022
Mystery of the Standing Stones
S18E2 / 14 Jan 2022
Beneath the Sacred Temples
S18E3 / 21 Jan 2022
The World on Alert
S18E4 / 28 Jan 2022
Recovering the Ark of the Covenant
S18E5 / 11 Feb 2022
Secrets of the Star Ancestors
S18E6 / 18 Feb 2022
Alien Air Force
S18E7 / 25 Feb 2022
The Shadow People
S18E8 / 04 Mar 2022
Decoding the Dragon Gods
S18E9 / 11 Mar 2022
The Time Benders
S18E10 / 18 Mar 2022
Ancient Aliens on Location: Incredible Structures
S18E11 / 08 Jul 2022
Ancient Aliens on Location: Extraordinary Encounters
S18E12 / 15 Jul 2022
Ancient Aliens on Location: Decoding the Alien Glyphs
S18E13 / 22 Jul 2022
Ancient Aliens On Location: The UFO Investigations
S18E14 / 29 Jul 2022
Ancient Aliens On Location: Mysterious Artifacts
S18E15 / 05 Aug 2022
Ancient Aliens on Location: Evidence of Alien Life
S18E16 / 12 Aug 2022
The Shining Ones
S18E17 / 19 Aug 2022
The Journey to Immortality
S18E18 / 26 Aug 2022
Secrets of Inner Earth
S18E19 / 09 Sep 2022
Return of the Egyptian Gods
S18E20 / 16 Sep 2022
Season 19
The Hotspot Connection
S19E1 / 06 Jan 2023
The Crop Circle Code
S19E2 / 13 Jan 2023
Mystery of the Lost Civilization
S19E3 / 20 Jan 2023
The Power of the Obelisks
S19E4 / 03 Feb 2023
The MUFON Files
S19E5 / 10 Feb 2023
Cosmic Impacts
S19E6 / 17 Feb 2023
Close Encounters of the Fifth Kind
S19E7 / 24 Feb 2023
The Mysteries of Alaska
S19E8 / 03 Mar 2023
Aliens in Our Airspace
S19E9 / 10 Mar 2023
The Giants of Malta
S19E10 / 17 Mar 2023
The Top Ten Pyramid Sites
S19E11 / 30 Jun 2023
The Top Ten Mysterious Devices
S19E12 / 07 Jul 2023
The Top Ten Mysterious Islands
S19E13 / 14 Jul 2023
The Top Ten Alien Craft
S19E14 / 21 Jul 2023
Edgar Cayce: The Sleeping Prophet
S19E15 / 04 Aug 2023
The Gods of Greece
S19E16 / 11 Aug 2023
The New UFO Hunters
S19E17 / 18 Aug 2023
The Power of the Talisman
S19E18 / 25 Aug 2023
The Top Ten Mysteries of the Deep
S19E19 / 08 Sep 2023
The Top Ten Alien Petroglyphs
S19E20 / 15 Sep 2023
Season 20
The Top Ten Alien Influencers
S20E1 / 05 Jan 2024
The Top Ten Extraordinary Creatures
S20E2 / 12 Jan 2024
The Top Ten Hidden Alien Bases
S20E3 / 19 Jan 2024
The Top Ten Scariest Encounters
S20E4 / 02 Feb 2024
The Top Ten Alien Codes
S20E5 / 09 Feb 2024
The Top Ten Alien Disasters
S20E6 / 16 Feb 2024
Secrets of the Sumerians
S20E7 / 23 Feb 2024
The UFO Superhighway
S20E8 / 01 Mar 2024
Mysteries of Scotland
S20E9 / 08 Mar 2024
Mystery of the Stone Spheres
S20E10 / 15 Mar 2024
Mysteries of the Maya
S20E11 / 28 Jun 2024
Unlocking the Stargates
S20E12 / 05 Jul 2024
The Whistleblowers
S20E13 / 12 Jul 2024
The Search for Extraterrestrial Intelligence
S20E14 / 19 Jul 2024
Jacques Vallée: UFO Pioneer
S20E15 / 09 Aug 2024
The Teachers
S20E16 / 16 Aug 2024
Egypt's Giant Tombs
S20E17 / 23 Aug 2024
The Linda Moulton Howe Files
S20E18 / 30 Aug 2024
The Chosen
S20E19 / 06 Sep 2024
Resurrecting Puma Punku
S20E20 / 13 Sep 2024
Season 21
The Top Ten Extraordinary Discoveries
S21E1 / 07 Feb 2025
The Top Ten Mysterious Monoliths
S21E2 / 14 Feb 2025
The Top Ten UFO Crashes
S21E3 / 21 Feb 2025
The Top Ten Unexplained Technologies
S21E4 / 28 Feb 2025
The Top Ten Secret Projects
S21E5 / 07 Mar 2025
The Top Ten Mysterious Mountains
S21E6 / 14 Mar 2025
Mysteries of the Aztecs
S21E7 / 21 Mar 2025
The Glowing Orb Phenomenon
S21E8 / 28 Mar 2025
The Legacy of J. Allen Hynek
S21E9 / 29 Aug 2025
The Volcano Factor
S21E10 / 05 Sep 2025
The Birdman Mystery
S21E11 / 12 Sep 2025
The Abduction Files
S21E12 / 19 Sep 2025
The Giants
S21E13 / 02 Oct 2025
Aliens in Our Midst
S21E14 / 09 Oct 2025
Britain's UFO Files
S21E15 / 16 Oct 2025
Mysteries of the Norse Gods
S21E16 / 23 Oct 2025
Secrets of Japan
S21E17 / 06 Nov 2025
Season 22
Skulls of the Gods
S22E1 / 15 Jan 2026
Egypt's Lost Pyramids
S22E2 / 22 Jan 2026
Island of the Gods
S22E3 / 29 Jan 2026
Extraterrestrial Engineering
S22E4 / 05 Feb 2026
UFO Hot Spots
S22E5 / 26 Feb 2026
Mysterious Monuments
S22E6 / 05 Mar 2026
Underwater Alien Bases
S22E7 / 11 Jun 2026
Secrets of the Vedas
S22E8 / 18 Jun 2026
Wars of the Gods
S22E9 / 25 Jun 2026
UFO Sightings
S22E10 / 02 Jul 2026
Alien A.I.
S22E11 / 09 Jul 2026
Hidden Messages
S22E12 / 16 Jul 2026
Secrets of the Amazon
S22E13 / 23 Jul 2026
Alien Investigators
S22E14 / 30 Jul 2026
Africa's Extraterrestrial Contact
S22E15 / 06 Aug 2026
Robert Clotworthy
Narrator (voice)
Giorgio A. Tsoukalos
Self
Ariel Bar Tzadok
Self
Jonathan Young
Self
David Childress
Self
Erich von Däniken
Self
Linda Moulton Howe
Self
