# In Search of... (TV series)

In Search of... is an American television series that was broadcast weekly from 1976 to 1982, devoted to mysterious phenomena. It was created after the success of three one-hour documentaries produced by creator Alan Landsburg: In Search of Ancient Astronauts in 1973 (based on the 1968 book/ 1970 film Chariots of the Gods? by Erich von Däniken), In Search of Ancient Mysteries (1974), and The Outer Space Connection in 1975 (later adapted into popular paperbacks written by Landsburg), all of which featured narration by Rod Serling, who was the initial choice to host the spin-off show. Serling died before production started, and Leonard Nimoy was then selected to be the host. The series was revived with host Mitch Pileggi in 2002 and again in 2018 with Zachary Quinto for the History channel.
The original series was shown in Australia in the 1980s under the title Great Mysteries of the World, with each episode having an introduction and conclusion presented by television presenter Scott Lambert.

## Format

Each episode of the program explored a general or specific topic in one of several general categories as given in the opening titles: Extraterrestrials, Magic & Witchcraft, Missing Persons, Myths & Monsters, Lost Civilizations, and Special Phenomena (changed to Strange Phenomena from season 3 onward). The program conducted investigations into the controversial and paranormal (e.g., UFOs, Bigfoot, and the Loch Ness Monster). Additionally, it featured episodes about mysterious historical events and personalities such as Anna Anderson, the Lincoln Assassination, the Jack the Ripper murders, infamous cults (e.g., Jim Jones), and missing persons, cities, and ships (e.g., Amelia Earhart, Jimmy Hoffa, D. B. Cooper, the Mary Celeste, the Titanic, the lost Roanoke Colony). Each episode's opening credits included a verbal disclaimer about the conjectural nature of the evidence and theories to be presented:
   This series presents information based in part on theory and conjecture. The producer's purpose is to suggest some possible explanations, but not necessarily the only ones, to the mysteries we will examine.
The program included interviews, reenactments, and host segments including Nimoy on location or in studio, and each episode featured voiceovers by Nimoy. The music was composed by Laurin M. Rinder and W. Michael Lewis. A soundtrack album was released on AVI (American Variety International) Records in 1977.
Nimoy wrote an episode about the turbulent life of artist Vincent van Gogh, having earlier played the artist's brother Theo in a one-man show. As part of his research, Nimoy found records in the archives of the hospital where Van Gogh was treated that suggested that he suffered from epilepsy rather than insanity.
The show also spawned at least six spin-off books, all written by Landsburg with forewords by Nimoy: In Search of Lost Civilizations, In Search of Extraterrestrials, In Search of Magic and Witchcraft, In Search of Strange Phenomena, In Search of Missing Persons, and In Search of Myths and Monsters, with an additional book that collected the best segments from these existing volumes.
In 1978, Landsburg produced a Bigfoot documentary using portions of two In Search of... episodes ("The Monster Hunters" and "The Yeti") called Manbeast! Myth or Monster, based on his book In Search of Myths and Monsters. Though Nimoy had written the foreword to Landsburg's book, he did not narrate this documentary.
Reruns of the In Search of... series aired during the early 1990s on the A&E Network. In the later 1990s, the show aired on another of the A&E Television Networks' properties, the History Channel. The licensing agreement with MCA Television/Universal Domestic Television expired in the early 2000s, ending the show's run. When the show aired on A&E, a re-recording of the original theme music was used plus a new alternate theme. The original opening titles were also modernized. In this incarnation virtually all of Nimoy's on-camera appearances in the series were replaced with reused footage, so viewers could hear Nimoy but not see him.
A short-lived revival of the show, featuring Mitch Pileggi, aired on the Sci-Fi Channel in 2002.
In January 2018, it was announced that Zachary Quinto, who, like Nimoy, stars as Spock in the rebooted Star Trek films, would host the revived version of the show on History Channel. On March 27, 2019, History Channel announced the series was renewed for a second season.

## Episodes

Seasons of In Search Of... :
| Season | Episodes | Episodes | Originally released | Originally released | Originally released |
| Season | Episodes | Episodes | First released | Last released | Network |
| Specials | 3 | 3 | January 5, 1973 (1973-1-5) | February 12, 1975 (1975-2-12) | NBC |
| 1 | 24 | 24 | 1976 (1976) | September 10, 1977 (1977-9-10) | NBC |
| 2 | 24 | 24 | December 24, 1977 (1977-12-24) | June 1, 1978 (1978-6-1) | NBC |
| 3 | 24 | 24 | September 14, 1978 (1978-9-14) | May 17, 1979 (1979-5-17) | NBC |
| 4 | 24 | 24 | September 20, 1979 (1979-9-20) | March 14, 1980 (1980-3-14) | NBC |
| 5 | 24 | 24 | September 20, 1980 (1980-9-20) | May 19, 1981 (1981-5-19) | NBC |
| 6 | 24 | 24 | September 21, 1981 (1981-9-21) | March 1, 1982 (1982-3-1) | NBC |
| 1 | 8 | 8 | October 4, 2002 (2002-10-4) | November 22, 2002 (2002-11-22) | Sci-Fi Channel |
| 1 | 10 | 10 | July 20, 2018 (2018-7-20) | September 14, 2018 (2018-9-14) | The History Channel |
| 2 | 8 | 8 | October 4, 2019 (2019-10-4) | November 29, 2019 (2019-11-29) | The History Channel |

### Specials

Three specials hosted by Rod Serling aired from 1973-1975.
| No. | Title | Directed by | Written by | Original release date |
| 01 | "In Search of Ancient Astronauts" | Harald Reinl | Don Ringe | January 5, 1973 (1973-01-05) (NBC) |
| Examines speculation about purported ancient astronauts, aliens that would have landed on Earth in ancient times, being responsible for many of mankind's oldest mysteries. |||||
| 02 | "In Search of Ancient Mysteries" | Fred Warshofsky | Fred Warshofsky | January 31, 1974 (1974-1-31) (NBC) |
| An examination of mysteries of the ancient world and their connection to the possibility that aliens visited Earth. |||||
| 03 | "The Outer Space Connection" | Fred Warshofsky | Fred Warshofsky | February 12, 1975 (1975-02-12) (Arizona) |
| Examines the speculation that aliens have visited Earth in ancient times, and built structures to which they will return at a future date. Screened at movie theaters throughout 1975. |||||

### Original Series

The original series ran for six seasons, hosted by Leonard Nimoy.

#### Season 1 (1976–1977)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 01 | 01 | "Other Voices" | H.G. Stark | Roz Karson | April 17, 1977 (1977-04-17) | 726 |
| Other Voices: Examines groundbreaking experiments that show the possibility that plants respond to people's thoughts. Guests in this episode include Marcel Vogel, Dorothy Retallack, Kendall Johnson, and Cleve Backster. |||||||
| 02 | 02 | "Strange Visitors" | Unknown | S: Hans Holzer; W: Hans Holzer & Robert L. Long | December 20, 1976 (1976-12-20) | 703 |
| Strange Visitors: Was Oracle Chamber, which lies beneath New Hampshire's Mystery Hill, built by ancient Phoenicians who traveled to the continent thousands of years ago? Guests include Robert Stone, Hans Holzer, and Barry Fell. |||||||
| 03 | 03 | "Ancient Aviators" | Unknown | Robert Long & Deborah Blum | April 24, 1977 (1977-04-24) | 708 |
| Ancient Aviators: Are there signs of alien visitation here on Earth? Might the mysterious markings on the Nazca Plain in Peru be landing instructions for UFOs? |||||||
| 04 | 04 | "The Bermuda Triangle" | H.G. Stark | Alan Lansburg | September 27, 1976 (1976-09-27) | 715 |
| The Bermuda Triangle: Probes a radio broadcast claim that the graveyard of ships and planes is actually a testing area for spacemen. Guests include Frank Flynn, Bob Spielman, Ray Smithers, and Carlton Hamilton |||||||
| 05 | 05 | "Bigfoot" | Nicholas Webster | Larry L. Badger | April 28, 1977 (1977-04-28) | 713 |
| Bigfoot: An evaluation of giant footprints and other evidence which some believe proves that the half-man, half-animal creature really exists. |||||||
| 06 | 06 | "Killer Bees" | Unknown | Alex Pomasanoff | May 1, 1977 (1977-05-01) | 735 |
| Killer Bees: A photographic report from Brazil on the behavior of the bees and genetic experiments underway to stop the savage swarms from reaching the U.S. |||||||
| 07 | 07 | "Earthquakes" | Unknown | Alex Pomasanoff | May 7, 1977 (1977-05-07) | 728 |
| Earthquakes: An examination of the techniques which scientists are developing in order to study seismic activity and predict quakes. |||||||
| 08 | 08 | "The Mummy's Curse" | Unknown | Robert L. Long | May 14, 1977 (1977-05-14) | 734 |
| The Mummy's Curse: Probes the claim that a protective curse on King Tutankhamun's tomb accounted for a chain of mysterious deaths. |||||||
| 09 | 09 | "Martians" | Unknown | Robert L. Long | May 21, 1977 (1977-05-21) | 733 |
| Martians: Offers the theory that the Red Planet is dying of climate changes and suggests that Earth may face a similar fate. Gerald Soffen is a guest in the episode. |||||||
| 10 | 10 | "Atlantis" | Unknown | Fred Warshofsky | May 22, 1977 (1977-05-22) | 701 |
| Atlantis: Explores the possibility that 14 huge stone buildings beneath the waters of The Bahamas, and a 2000-year-old computer part, are part of the lost empire of Atlantis. |||||||
| 11 | 11 | "Psychic Detectives" | Unknown | Deborah Blum | May 26, 1977 (1977-05-26) | 736 |
| Psychic Detectives: Meet a unique scientific detective squad that uses E.S.P. as an effective crime-solving tool. |||||||
| 12 | 12 | "A Call from Space" | Unknown | Christine Zurbach Wiser | May 28, 1977 (1977-05-28) | 729 |
| A Call from Space: Can the space technologies that discovered other galaxies help us communicate with other life? |||||||
| 13 | 13 | "Learning ESP" | Unknown | Robert L. Long | May 28, 1977 (1977-05-28) | 730 |
| Learning ESP: Do the powers of extrasensory perception really exist, and can they be taught? |||||||
| 14 | 14 | "Nazi Plunder" | Unknown | Tyrone Fox | May 29, 1977 (1977-05-29) | TBA |
| Nazi Plunder: Pursues the rumor of Nazi plunder worth billions and a 30-year-old track that could lead to it. |||||||
| 15 | 15 | "Amelia Earhart" | Unknown | Alex Pomasanoff | June 1, 1977 (1977-06-01) | 718 |
| Amelia Earhart: Runs down rumors that the famous aviator, who disappeared during a 1937 flight over the Pacific Ocean, was on a spy mission. |||||||
| 16 | 16 | "Dracula" | H. G. Stark | Jeremy Brink | June 8, 1977 (1977-06-08) | 712 |
| Dracula: Investigates the life and recorded history of Vlad the Impaler in Romania, with comparisons to the main character of the famous Bram Stoker novel. |||||||
| 17 | 17 | "The Easter Island Massacre" | H. G. Stark | Deborah Blum | June 15, 1977 (1977-06-15) | 709 |
| The Easter Island Massacre: Provides answers to the mysteries of how 70-ton giant stones came to the remote island and who might have destroyed some of them. |||||||
| 18 | 18 | "Ghosts" | H. G. Stark | Hans Holzer & Robert L. Long | October 4, 1976 (1976-10-04) | 704 |
| Ghosts: Studies specters and a parapsychologist's theory that they are troubled earthbound souls in need of help. |||||||
| 19 | 19 | "Life After Death" | H. G. Stark | Deborah Blum | June 29, 1977 (1977-06-29) | 720 |
| Life after Death: A visit to a soul research institute for firsthand accounts of people who claim they have died and come back to life. |||||||
| 20 | 20 | "The Loch Ness Monster" | H. G. Stark | Robert L. Long | September 20, 1976 (1976-09-20) | 725 |
| The Loch Ness Monster: A hunt for the leviathan which has so far eluded all expeditions to prove that it truly exists. Includes footage of Bob Ballard as he performs underwater photography in an attempt to identify the monster. |||||||
| 21 | 21 | "UFOs" | H. G. Stark | Robert L. Long | October 11, 1976 (1976-10-11) | 702 |
| UFOs: An evaluation of reports by people who have seen "saucers", and the growing body of evidence that America is regularly being visited by UFOs. |||||||
| 22 | 22 | "Voodoo" | H. G. Stark | Alan Landsburg | July 26, 1977 (1977-07-26) | 714 |
| Voodoo: Experience an actual voodoo rite, and meet a priest dedicated to disarming its effects. |||||||
| 23 | 23 | "Inca Treasure" | H. G. Stark | Robert Long | August 11, 1977 (1977-08-11) | TBA |
| Inca Treasures: Camera crews accompany a Peruvian excavation party in quest of a great Inca city believed lost for 300 years. |||||||
| 24 | 24 | "The Magic of Stonehenge" | Unknown | Deborah Blum | September 10, 1977 (1977-09-10) | 727 |
| The Magic of Stonehenge: Suggests the site could be the source of a mysterious power that might hold all of Britain in a strange magnetic force field. |||||||

#### Season 2 (1977–1978)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 25 | 01 | "The Lost Dutchman Mine" | Unknown | Richard J. Wells | December 24, 1977 (1977-12-24) | TBA |
| The Lost Dutchman Mine: An investigation into why hundreds of gold hunters have died searching for a lost treasure ever since a German prospector wandered out of Arizona's Superstition Mountains in the 1860s. Is there really cursed gold hidden there, as Apache lore suggests? |||||||
| 26 | 02 | "The Man Who Would Not Die" | Unknown | Nicholas Webster | December 31, 1977 (1977-12-31) | 753 |
| The Man Who Would Not Die: The fascinating saga of the Count of St. Germain, who dazzled the courts of Europe for over 100 years, leading some to believe he was immortal. Elizabeth Clare Prophet describes the Church Universal and Triumphant's reverence for St. Germain. |||||||
| 27 | 03 | "Firewalkers" | Unknown | Norma Thorn | January 5, 1978 (1978-01-05) | 719 |
| Firewalkers: How do people walk on red-hot coals without being burned? |||||||
| 28 | 04 | "Mayan Mysteries" | Unknown | Terry A. Landau | January 7, 1978 (1978-01-07) | 744 |
| Mayan Mysteries: The Mayans of Mexico carved an advanced civilization out of the jungles, then disappeared. Where did they come from? Where did they go? |||||||
| 29 | 05 | "Astrology" | Unknown | Peter Rosten | January 12, 1978 (1978-01-12) | 750 |
| Astrology: Can astronomical movements affect the affairs of man? Leonard Nimoy reviews the long history of astrology and looks at its attraction today. |||||||
| 30 | 06 | "Michael Rockefeller" | Unknown | Alex Pomasanoff | January 21, 1978 (1978-01-21) | 740 |
| Michael Rockefeller: Did he drown or was he murdered? An investigation into the disappearance of Nelson Rockefeller's youngest son who vanished without a trace among some of the most primitive peoples in the world. |||||||
| 31 | 07 | "Hurricanes" | Unknown | Unknown | January 26, 1978 (1978-01-26) | 758 |
| Hurricanes: Take a close-up look at these violent killers that have taken the lives of hundreds of thousands of people. Can they be controlled or prevented? |||||||
| 32 | 08 | "The Ogopogo Monster" | Unknown | Unknown | January 28, 1978 (1978-01-28) | 762 |
| The Ogopogo Monster: This large beast, similar to Scotland's Loch Ness Monster, is claimed to have been seen by thousands of people in western Canada. |||||||
| 33 | 09 | "Pyramid Secrets" | Unknown | Unknown | February 4, 1978 (1978-02-04) | 746 |
| Pyramid Secrets: Examines the theory that the pyramids of Egypt were built to provide shelter from a holocaust, not as tombs for the pharaohs. |||||||
| 34 | 10 | "Dead Sea Scrolls" | Unknown | Unknown | February 9, 1978 (1978-02-09) | 748 |
| Dead Sea Scrolls: The story of the 2,000-year-old scrolls, discovered by a shepherd, that revolutionized religious thought. |||||||
| 35 | 11 | "Reincarnation" | Unknown | Unknown | February 11, 1978 (1978-02-11) | 706 |
| Reincarnation: Reviews case histories of people who claim to have lived in previous lifetimes. |||||||
| 36 | 12 | "The Shark Worshippers" | Unknown | Unknown | February 18, 1978 (1978-02-18) | 760 |
| The Shark Worshippers: A trip to remote parts of the Pacific where man-eating sharks are considered gods. Adults pray to them and children swim unafraid among them. |||||||
| 37 | 13 | "Anastasia" | Unknown | Unknown | February 23, 1978 (1978-02-23) | 737 |
| Anastasia: An examination of evidence that the youngest daughter of Russia's Tsar Nicholas II Aleksandrovich Romanov survived the family executions, and settled in Charlottesville, Virginia. NOTE: This was produced years before Anna Anderson Manahan, as she in time came to be known, was proven, through DNA evidence which could not have been forensically examined at the time, to have been an impostor. |||||||
| 38 | 14 | "The Secrets of Life" | Unknown | Unknown | February 25, 1978 (1978-02-25) | 751 |
| Secrets of Life: Explores the possibility that human life can be created in laboratories engaged in DNA research. |||||||
| 39 | 15 | "Immortality" | Unknown | Unknown | February 27, 1978 (1978-02-27) | 742 |
| Immortality: Looks at scientific discoveries of new methods of prolonging human life, such as cryonics, which can suspend life for centuries. |||||||
| 40 | 16 | "The Swamp Monster" | Unknown | Unknown | March 4, 1978 (1978-03-04) | 738 |
| The Swamp Monster: An investigation of reports that a huge man-like beast is living in the swamps of Louisiana's bayou. |||||||
| 41 | 17 | "Hypnosis" | Unknown | Unknown | March 9, 1978 (1978-03-09) | 759 |
| Hypnosis: A look back at the great scientist Mesmer, whose hypnotic techniques are being used in modern surgery, teaching, and police investigations. (See also Learning ESP.) |||||||
| 42 | 18 | "Troy" | Unknown | Unknown | March 11, 1978 (1978-03-11) | 752 |
| Troy: The story of Heinrich Schliemann, an eccentric self-made millionaire obsessed with discovering the ruins of Troy at a time when the city was considered a fable that never existed. He discovered not one but nine ancient cities in Turkey, and recovered a hoard of spectacular relics. |||||||
| 43 | 19 | "Witch Doctors" | Unknown | Alex Pomasanoff | March 18, 1978 (1978-03-18) | 732 |
| Witch doctors: Leonard Nimoy hosts this look at ancient folk medicines that are being reinstituted today in modern mental institutions and are yielding positive results. |||||||
| 44 | 20 | "Haunted Castles" | Unknown | Unknown | April 27, 1978 (1978-04-27) | 754 |
| Haunted Castles: Probe into one of the world's most haunted places. |||||||
| 45 | 21 | "Butch Cassidy" | TBA | TBA | TBA | 743 |
| Butch Cassidy: Examines the possibility that Butch Cassidy was not killed in Bolivia along with the Sundance Kid, but actually lived a full life and died peacefully in 1937. |||||||
| 46 | 22 | "Deadly Ants" | TBA | TBA | TBA | 739 |
| Deadly Ants: A look at the billions of fire ants that march across the southern United States and the failure so far of all attempts to stop them. |||||||
| 47 | 23 | "The Coming Ice Age" | TBA | TBA | TBA | 741 |
| The Coming Ice Age: An inquiry into whether the dramatic weather changes in America's northern states mean that a new ice age is approaching. |||||||
| 48 | 24 | "The Garden of Eden" | Unknown | Unknown | June 1, 1978 (1978-06-01) | TBA |
| Garden of Eden: Using the Old Testament as a road map, researchers attempt to trace the possible site of the original Garden to India, China, and an island off the coast of Saudi Arabia. |||||||

#### Season 3 (1978–1979)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 49 | 01 | "UFO Captives" | Unknown | Unknown | September 14, 1978 (1978-09-14) | 768 |
| UFO Captives: Meet people who believe they have been held captive aboard alien spacecraft - close encounters of the fourth kind. |||||||
| 50 | 02 | "Tornadoes" | Unknown | Unknown | September 21, 1978 (1978-09-21) | 772 |
| Tornadoes: A terrifying look at one of nature's deadliest forces. Tornadoes can swallow up buildings and people without a trace - can they be stopped? |||||||
| 51 | 03 | "Cloning" | Unknown | Unknown | September 28, 1978 (1978-09-28) | 771 |
| Cloning: An in-depth look at the process which may allow us to "copy" people exactly and produce single-parent human beings. |||||||
| 52 | 04 | "Water Seekers" | Unknown | Unknown | October 5, 1978 (1978-10-05) | 777 |
| Water Seekers: Scientists take another look at the divining rod. Does water emit valuable signals? |||||||
| 53 | 05 | "Jack the Ripper" | Unknown | Unknown | October 12, 1978 (1978-10-12) | 763 |
| Jack the Ripper: An investigative report on the unsolved mystery of London's notorious serial killer. The episode reveals the killer's connection with contemporary media and the possible involvement with the Ancient Free And Accepted Masons. Various identities are suggested as being that of the killer, including a duke who was second in line to the British throne. |||||||
| 54 | 06 | "Cryogenics" | Unknown | Unknown | October 19, 1978 (1978-10-19) | 765 |
| Cryogenics: Scientists are discovering new methods to prolong human life and, in the case of cryogenics, to suspend the possibility of life for centuries. |||||||
| 55 | 07 | "Siberian Fireball" | Unknown | Unknown | October 26, 1978 (1978-10-26) | 767 |
| Siberian Fireball: Considers the possibility that the unexplained and catastrophic explosion in Siberia in 1908 was an atomic blast occurring 37 years before the development of the A-bomb. |||||||
| 56 | 08 | "The Great Lakes Triangle" | Unknown | Unknown | November 2, 1978 (1978-11-02) | 774 |
| The Great Lakes Triangle: Investigates efforts by scientists and psychics to discover the mysterious forces around the Great Lakes that have caused more air and sea disasters than the Bermuda Triangle. |||||||
| 57 | 09 | "Monster Hunters" | Unknown | Unknown | November 9, 1978 (1978-11-09) | 770 |
| Monster Hunters: Leonard Nimoy investigates what compels scientists and teachers to pursue a man-like beast in Northern California. |||||||
| 58 | 10 | "Bermuda Triangle Pirates" | Unknown | Unknown | December 7, 1978 (1978-12-07) | 775 |
| Bermuda Triangle Pirates: Luxurious yachts are disappearing off the coast of Florida. Are pirates trafficking in drugs to blame? |||||||
| 59 | 11 | "Indian Astronomers" | Unknown | Unknown | December 14, 1978 (1978-12-14) | TBA |
| Indian Astronomers: Recent excavations in Southern Illinois provide tantalizing glimpses at Native American use of astronomy. |||||||
| 60 | 12 | "Sherlock Holmes" | Unknown | Unknown | December 21, 1978 (1978-12-21) | 779 |
| Sherlock Holmes: A look at surprising new clues which indicate that the famed super sleuth actually did exist, after a fashion. |||||||
| 61 | 13 | "Lost Vikings" | Unknown | Unknown | December 28, 1978 (1978-12-28) | TBA |
| Lost Vikings: The story of Viking Erik the Red's descendants, who left Scandinavia and arrived in Northern Canada centuries before Columbus. |||||||
| 62 | 14 | "Dreams and Nightmares" | Unknown | Unknown | January 4, 1979 (1979-01-04) | 766 |
| Dreams and Nightmares: Our dreams provide clues to the dark world of our unconscious mind, but can we learn to control them? |||||||
| 63 | 15 | "Animal ESP" | Unknown | Unknown | January 11, 1979 (1979-01-11) | 786 |
| Animal ESP: Dramatic scenes attempt to demonstrate that close communication between people and their pets may be due to more than emotional bonds. |||||||
| 64 | 16 | "The Money Pit Mystery" | Unknown | Unknown | January 18, 1979 (1979-01-18) | 776 |
| The Money Pit Mystery: A true tale of hidden treasure and mysterious death. Six people have died in the scramble to dig up the Oak Island treasures, supposedly buried by Captain Kidd. |||||||
| 65 | 17 | "Psychic Sea Hunt" | Unknown | Unknown | January 25, 1979 (1979-01-25) | 784 |
| Psychic Sea Hunt: A team of psychics gives scientists the exact description and location of an unknown shipwreck, and a submarine hunt proves them right. |||||||
| 66 | 18 | "The Angel of Death" | Unknown | Unknown | February 1, 1979 (1979-02-01) | 782 |
| Angel of Death: Nazi hunter Simon Wiesenthal tracks infamous war criminal Josef Mengele to his hiding place in Paraguay. Mengele is believed to have died only six days after this episode was broadcast, having drowned as a result of a stroke while swimming. At the time of his death, his identity was not widely known. Years after this installment was initially transmitted, Mengele's remains were found and identified; he proved to have had to eke out a bare existence as a farm worker, and his punishment for his war crimes was to have lived out the rest of his days in both comparative obscurity and the fear of eventual discovery. |||||||
| 67 | 19 | "Noah's Flood" | Unknown | Unknown | February 8, 1979 (1979-02-08) | 783 |
| Noah's Flood: A dramatic inquiry into whether or not scientific proof exists for the legend of the Biblical Great Flood. |||||||
| 68 | 20 | "The Diamond Curse" | Unknown | Unknown | February 15, 1979 (1979-02-15) | 787 |
| The Diamond Curse: Why do mystery and tragedy plague the owners of great gems like the Hope Diamond? |||||||
| 69 | 21 | "Ghostly Stakeout" | Unknown | Unknown | February 22, 1979 (1979-02-22) | 789 |
| Ghostly Stakeout: In a haunted house, a psychic team contacts troubled spirits that live on after death. |||||||
| 70 | 22 | "Brain Power" | Unknown | Unknown | March 17, 1979 (1979-03-17) | 790 |
| Brain Power: A study of the incredible hidden potential of the human mind, including the possibility that average people can become geniuses. |||||||
| 71 | 23 | "Sodom & Gomorrah" | Unknown | Unknown | May 10, 1979 (1979-05-10) | 764 |
| Sodom and Gomorrah: Studies evidence developed by archaeologists suggesting that the two wicked cities existed on the site of a crater now filled in by the Dead Sea. |||||||
| 72 | 24 | "King Tut" | Unknown | Unknown | May 17, 1979 (1979-05-17) | 780 |
| King Tut: Investigates the ancient Egyptian monarch's final days. Was he a beloved leader who died a natural death or did court intrigues lead to his assassination? Years after this installment was transmitted, Egyptological historians became convinced that Tutankhamun was in atrocious health for almost his entire life due to birth deformities. These historians came to believe that his birth deformities resulted from inbreeding within the Pharaoh's family. |||||||

#### Season 4 (1979–1980)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 73 | 01 | "Tidal Waves" | Unknown | Unknown | September 20, 1979 (1979-09-20) | 830 |
| Tidal Waves: See a reenactment of the incredible destruction wrought by the tsunami (giant sea wave) that struck Hawaii in 1960. |||||||
| 74 | 02 | "Carlos, the Most Wanted Man in the World" | Unknown | Unknown | September 27, 1979 (1979-09-27) | 847 |
| Carlos, The World's Most Wanted Man: A chilling profile of the playboy-turned-terrorist called Carlos the Jackal, who was called "The World's Most Wanted Man." In 1994, Carlos was given up to French intelligence by the Government of Sudan, was charged and subsequently convicted of murder of an informant and is serving a life term in prison, which was lengthened with an additional life term for a terrorist attack on French soil. |||||||
| 75 | 03 | "The Amityville Horror" | Unknown | Unknown | October 4, 1979 (1979-10-04) | 831 |
| The Amityville Horror: A dream house in a lovely suburb becomes a nightmare when the owners discover an evil presence. The house was the site of a family massacre in 1974, which would inspire the 1979 movie and its 2005 remake. |||||||
| 76 | 04 | "UFO Australia" | Unknown | Unknown | October 11, 1979 (1979-10-11) | 836 |
| UFO Australia: Actual film footage of unidentified flying objects flying Down Under. Includes interview with New Zealand pilot and author Bruce Cathie. |||||||
| 77 | 05 | "Immortal Sharks" | Unknown | Unknown | October 18, 1979 (1979-10-18) | 837 |
| Immortal Sharks: Why has the great white shark not evolved as other animals have? Leonard Nimoy hosts this look at this most ancient and primitive creature. |||||||
| 78 | 06 | "The Lost Colony of Roanoke" | Unknown | Unknown | October 25, 1979 (1979-10-25) | 834 |
| The Lost Colony of Roanoke: A look at new evidence which offers an intriguing theory about where the colonists went. |||||||
| 79 | 07 | "The Shroud of Turin" | Unknown | Unknown | November 8, 1979 (1979-11-08) | 825 |
| The Shroud of Turin: An in-depth examination of the famed cloth that many believe holds the image of Jesus Christ. |||||||
| 80 | 08 | "Mexican Pyramids" | Unknown | Unknown | November 15, 1979 (1979-11-15) | 838 |
| Mexican Pyramids: The bloody story of the great pyramids, which were used for daily human sacrifices. |||||||
| 81 | 09 | "The Abominable Snowman" | Unknown | Unknown | November 22, 1979 (1979-11-22) | 832 |
| The Abominable Snowman: Leonard Nimoy examines the experiences of the explorers who say they have actually sighted the legendary creature. |||||||
| 82 | 10 | "Pompeii" | TBA | TBA | TBA | TBA |
| Pompeii: This great Roman city was a wealthy resort and mecca for fun-lovers before it was destroyed by the eruption of Mount Vesuvius. Were early Christians among the Roman revelers? |||||||
| 83 | 11 | "D.B. Cooper" | Unknown | Unknown | December 6, 1979 (1979-12-06) | 850 |
| D. B. Cooper: The incredible story of the man who hijacked a jetliner, parachuted out with his loot, and was never seen again. |||||||
| 84 | 12 | "The Ten Commandments" | Unknown | Unknown | December 13, 1979 (1979-12-13) | 843 |
| The Ten Commandments: Leonard Nimoy profiles Moses and tries to pinpoint Mount Sinai's exact location. Have pilgrims to the Holy Land been praying at the wrong location? |||||||
| 85 | 13 | "The Dark Star" | Unknown | Unknown | December 20, 1979 (1979-12-20) | 848 |
| The Dark Star: Travel to Africa to find out why the Dogon, a primitive tribe knows so much about astronomy, a black hole, and travelers from outer space. |||||||
| 86 | 14 | "The San Andreas Fault" | Unknown | Unknown | December 27, 1979 (1979-12-27) | 840 |
| The San Andreas Fault: Analyzes California's great earthquake fault line to determine whether the long-predicted catastrophic quake can be predicted. |||||||
| 87 | 15 | "The Missing Heir" | Unknown | Unknown | January 3, 1980 (1980-01-03) | 842 |
| The Missing Heirs: There is still a $3.2 million fortune that remains unclaimed after a century. To whom does it belong? |||||||
| 88 | 16 | "Vincent Van Gogh" | Unknown | Leonard Nimoy | January 10, 1980 (1980-01-10) | 849 |
| Van Gogh: A look at the life and death of the great Dutch master—was he really mad? Host Leonard Nimoy, who wrote this installment partially to promote his one-man show Vincent, found evidence that he was not. |||||||
| 89 | 17 | "Wild Children" | Unknown | Unknown | January 17, 1980 (1980-01-17) | 826 |
| Wild Children: Can these children survive in civilization? Leonard Nimoy examines several historical cases. |||||||
| 90 | 18 | "The Ghost Ship" | Unknown | Unknown | January 24, 1980 (1980-01-24) | 827 |
| The Ghost Ship: In 1872, the captain and crew of the Mary Celeste vanished without a trace. The sails were set to the wind and breakfast was on the table. Who or what possessed the ship? |||||||
| 91 | 19 | "Earth Visitors" | Unknown | Unknown | January 31, 1980 (1980-01-31) | 844 |
| Earth Visitors: Were our earliest ancestors travelers from other planets? |||||||
| 92 | 20 | "John the Baptist" | Unknown | Unknown | February 7, 1980 (1980-02-07) | 841 |
| John the Baptist: An investigation to determine whether the great holy man's remains are in Europe or Egypt. |||||||
| 93 | 21 | "Air Disaster Prediction" | Unknown | Unknown | February 14, 1980 (1980-02-14) | 829 |
| Air Disaster Predictions: A study of reports that major air crashes have been seen or predicted beforehand in nightmares. Includes the 1979 crash of American Airlines Flight 191. |||||||
| 94 | 22 | "The Bimini Wall" | Unknown | Unknown | February 21, 1980 (1980-02-21) | 851 |
| The Bimini Wall: The saga of the giant stones found at the bottom of the Caribbean. Leonard Nimoy probes whether they might be part of the ancient, supposedly mythical, empire of Atlantis. |||||||
| 95 | 23 | "Glenn Miller" | Unknown | Unknown | March 7, 1980 (1980-03-07) | 845 |
| Glenn Miller: An inquiry into why the mysterious death—or disappearance—of the great musician was never investigated, and a possible military cover-up. |||||||
| 96 | 24 | "Past Lives" | Unknown | Unknown | March 14, 1980 (1980-03-14) | 833 |
| Past Lives: Can reincarnation be proved? Leonard Nimoy examines the data, testimony, and theories. |||||||

#### Season 5 (1980–1981)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 97 | 01 | "UFO Coverups" | Unknown | Unknown | September 20, 1980 (1980-09-20) | 856 |
| UFO Cover-Ups: Examines charges that the U.S. Air Force is hiding alien corpses and the remains of crashed space craft in Hangar 18 of Wright-Patterson Air Force Base in Ohio. NOTE: This was one of the first nationally broadcast programs to discuss the so-called Roswell Incident. |||||||
| 98 | 02 | "Faith Healing" | Unknown | Unknown | September 27, 1980 (1980-09-27) | 852 |
| Faith Healing: Is faith healing a hoax or holistic medicine? |||||||
| 99 | 03 | "Lee Harvey Oswald" | Unknown | Unknown | October 4, 1980 (1980-10-04) | 854 |
| Lee Harvey Oswald: The assassination of John F. Kennedy: was there visual proof of two guns in Dallas and possibly two Oswalds? |||||||
| 100 | 04 | "Daredevil Death Wish" | Unknown | Unknown | October 11, 1980 (1980-10-11) | 859 |
| Daredevil Death Wish: A look at some of the impossible stunts daredevils attempt, and why they keep trying even after suffering near-fatal injuries. This reflected and echoed one of the That's Incredible! segments, "Incredibly Dangerous," which itself became embroiled in controversy when some of the stuntmen/daredevils it featured were injured severely enough to ruin their careers as such. |||||||
| 101 | 05 | "Life After Life" | Unknown | Unknown | October 18, 1980 (1980-10-18) | 855 |
| Life after Life: The stories of people who claim they have had after-life experiences and say they no longer fear death. |||||||
| 102 | 06 | "Moon Madness" | Unknown | Unknown | October 25, 1980 (1980-10-25) | 853 |
| Moon Madness: Violence and passion are commonplace when the moon is full. Is there any truth to the Werewolf legends? Leonard Nimoy hosts this historical look at lunacy. |||||||
| 103 | 07 | "Dangerous Volcanoes" | Unknown | Unknown | November 1, 1980 (1980-11-01) | 868 |
| Dangerous Volcanoes: Scientists wonder whether California's Mount Shasta, Washington's Mount St. Helens, and other American volcanoes will soon erupt again. |||||||
| 104 | 08 | "The Lindbergh Kidnapping" | Unknown | Unknown | November 8, 1980 (1980-11-08) | 864 |
| The Lindbergh Kidnapping: Digs for the facts behind the controversy that still rages today, the kidnapping of Charles Lindbergh's baby. Was the wrong man executed for the crime? |||||||
| 105 | 09 | "Acupuncture" | Unknown | Unknown | November 15, 1980 (1980-11-15) | 870 |
| Acupuncture: A study of the healing technique which may cure incurable diseases. Leonard Nimoy investigates the power of the ancient Chinese healing art. |||||||
| 106 | 10 | "Jimmy Hoffa" | Unknown | Unknown | November 22, 1980 (1980-11-22) | 862 |
| Jimmy Hoffa: A probe into the disappearance of James Riddle Hoffa, the mob-connected President of the International Brotherhood of Teamsters. Was he killed, kidnapped, or did he go underground? |||||||
| 107 | 11 | "Fountain of Youth" | Unknown | Unknown | November 29, 1980 (1980-11-29) | TBA |
| The Fountain of Youth: A look at the various scientific ways people use to stay young for years longer. |||||||
| 108 | 12 | "Laugh Therapy" | Unknown | Unknown | December 6, 1980 (1980-12-06) | 858 |
| Laugh Therapy: Can laughter combat disease? A Nobel Prize winner says he cured himself after doctors gave up hope. |||||||
| 109 | 13 | "Salem Witches" | Unknown | Unknown | December 13, 1980 (1980-12-13) | 865 |
| Salem Witches: Are the witches of Salem still casting spells in Massachusetts? |||||||
| 110 | 14 | "Super Children" | Unknown | Unknown | December 27, 1980 (1980-12-27) | 867 |
| Super Children: Investigates scientific efforts to produce a generation of child prodigies; are they born or made? |||||||
| 111 | 15 | "The Great Wall of China" | Unknown | Unknown | January 10, 1981 (1981-01-10) | 869 |
| The Great Wall of China: The story of the one of the world's greatest wonders - who built it and why? |||||||
| 112 | 16 | "The Castle of Secrets" | Unknown | Unknown | January 24, 1981 (1981-01-24) | 876 |
| The Castle of Secrets: The saga of the Coral Castle, said to have been built by Edward Leedskalnin, a frail hermit who allegedly carved and lifted 1,100 tons of solid stone blocks weighing up to 30 tons each using the secrets of Atlantis. |||||||
| 113 | 17 | "The Great Lovers" | Unknown | Leonard Nimoy | January 31, 1981 (1981-01-31) | 878 |
| The Great Lovers: A look at some of history's famous lovers. What drove certain men to pursue sensual pleasure above all else? The program compares the legends of Don Juan and Casanova. Host Leonard Nimoy wrote this installment. |||||||
| 114 | 18 | "The Holy Grail" | Unknown | Unknown | February 7, 1981 (1981-02-07) | 879 |
| The Holy Grail: Explores the claims that the chalice used by Jesus at the Last Supper may have been found. |||||||
| 115 | 19 | "The Death of Marilyn Monroe" | Unknown | Unknown | February 14, 1981 (1981-02-14) | 860 |
| The Death of Marilyn Monroe: Examines evidence that suggests that the Hollywood star may not have committed suicide. |||||||
| 116 | 20 | "Chinese Explorers" | Unknown | Unknown | February 21, 1981 (1981-02-21) | 871 |
| Chinese Explorers: Did the Chinese discover America 1,000 years before Columbus? Leonard Nimoy explores evidence that a Buddhist monk named Hu-Shen arrived on the American continent in AD 458. |||||||
| 117 | 21 | "The Hindenburg Mystery" | Unknown | Unknown | February 21, 1981 (1981-02-21) | 873 |
| The Hindenburg Mystery: A probe into the theory alleging that the famed Nazi "lighter-than-air" ship, which exploded while landing at Lakehurst, New Jersey, in 1937, was destroyed by political saboteurs. |||||||
| 118 | 22 | "The End of the World" | Unknown | Unknown | April 30, 1981 (1981-04-30) | 877 |
| The End of the World: Will an asteroid or comet on a collision course with Earth end it all? |||||||
| 119 | 23 | "The Lusitania" | Unknown | Unknown | May 16, 1981 (1981-05-16) | 874 |
| The Lusitania: An in-depth examination into the sinking of the British liner by a German submarine in 1915, killing over 1,000 passengers, including 114 Americans. Was it really all part of a plot to involve the U.S. in World War I? |||||||
| 120 | 24 | "Sun Worshippers" | Unknown | Unknown | May 19, 1981 (1981-05-19) | 866 |
| Sun Worshippers: Will solar energy free us from dependence on foreign oil? Leonard Nimoy analyzes how solar energy stacks up against fossil fuel and nuclear energy. |||||||

#### Season 6 (1981–1982)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 121 | 01 | "Jesse James" | Unknown | Unknown | September 21, 1981 (1981-09-21) | 913 |
| Jesse James: Probes one of the most intriguing questions of the Old West—was legendary gunman Jesse James shot in the back, or did he escape capture and live to a ripe old age? |||||||
| 122 | 02 | "Biofeedback" | Unknown | Unknown | September 28, 1981 (1981-09-28) | 901 |
| Biofeedback: A revealing study of how computers are now healing the sick and building sports champions. |||||||
| 123 | 03 | "Ghosts in Photography" | Unknown | Unknown | October 5, 1981 (1981-10-05) | 915 |
| Ghosts in Photography: Is it possible to photograph the dead? |||||||
| 124 | 04 | "M.I.A.'s" | Unknown | Unknown | October 12, 1981 (1981-10-12) | 914 |
| M.I.A.s: An investigation into a highly controversial and emotional question: Are American servicemen still lingering in prison in Vietnam? |||||||
| 125 | 05 | "The Elephant Man" | Unknown | Unknown | October 19, 1981 (1981-10-19) | 912 |
| The Elephant Man: From side-show freak to the friend of royalty, review the true story of the horribly disfigured Joseph Merrick. |||||||
| 126 | 06 | "The Lincoln Conspiracy" | Unknown | Unknown | October 26, 1981 (1981-10-26) | 907 |
| The Lincoln Conspiracy: Cracks "the case of the 19th century"—how the assassination of Abraham Lincoln was meticulously planned and abominably executed. |||||||
| 127 | 07 | "Jim Jones" | Unknown | Unknown | October 31, 1981 (1981-10-31) | 908 |
| Jim Jones: The story that shocked the world—how Jim Jones, the cult Svengali from California, convinced over 900 of his followers to follow him—first to a commune in Guyana and then into suicide. |||||||
| 128 | 08 | "King Solomon's Mines" | Unknown | Unknown | November 2, 1981 (1981-11-02) | 920 |
| King Solomon's Mines: A look at one of the most exciting searches of all—the hunt for the riches of the Old Testament. Did King Solomon actually have a mine near Mount Sinai? |||||||
| 129 | 09 | "The Tower of London Murders" | Unknown | Unknown | November 9, 1981 (1981-11-09) | 903 |
| The Tower of London Murders: How the destiny of England was changed by the disappearance of young princes from the fabled Tower. Were they murdered on the orders of their uncle, Richard III of England? |||||||
| 130 | 10 | "The Aztec Conquest" | Unknown | Unknown | November 16, 1981 (1981-11-16) | 922 |
| The Aztec Conquest: Why did the great Montezuma surrender to Cortes without fighting? What part did Aztec legend about a bearded white god play in the ultimate downfall of the Aztec Empire? |||||||
| 131 | 11 | "Houdini's Secrets" | Unknown | Unknown | November 21, 1981 (1981-11-21) | 916 |
| Houdini's Secrets: Probes the still-mysterious secrets of the world's greatest escape artist, including the theory that Houdini came back after death. |||||||
| 132 | 12 | "Hiroshima Survivors" | Unknown | Unknown | November 23, 1981 (1981-11-23) | 904 |
| Hiroshima Survivors: A revealing study of the wounds suffered by survivors of the first A-bomb blast, which killed more than 80,000 Japanese civilians on August 6, 1945. |||||||
| 133 | 13 | "The Titanic" | Unknown | Unknown | November 30, 1981 (1981-11-30) | 918 |
| Titanic: Investigates the most perplexing question about the 1912 North Atlantic disaster that cost 1,496 lives: Why did the captain ignore the ice warnings and speed on into oblivion? |||||||
| 134 | 14 | "Future Life" | Unknown | Unknown | December 6, 1981 (1981-12-06) | 923 |
| Future Life: What might the world be like for our children? |||||||
| 135 | 15 | "Nostradamus" | Unknown | Unknown | December 13, 1981 (1981-12-13) | 911 |
| Nostradamus: Examines the life of Nostradamus and his predictions. |||||||
| 136 | 16 | "Spirit Voices" | Unknown | Unknown | December 20, 1981 (1981-12-20) | 925 |
| Spirit Voices: Do loved ones call back to us from their next lives? Leonard Nimoy examines historical claims of voices from the beyond, as well as scientific research into the possibility of spirit voices. |||||||
| 137 | 17 | "The Human Aura" | Unknown | Unknown | January 3, 1982 (1982-01-03) | 910 |
| The Human Aura: A look at the multi-colored rays we transmit, which seem to change with our moods. |||||||
| 138 | 18 | "The Missing Link" | Unknown | Unknown | January 17, 1982 (1982-01-17) | 921 |
| The Missing Link: Delves into one of the most intriguing questions of all—which side is right, science or creationists? |||||||
| 139 | 19 | "Time & Space Travel" | Unknown | Unknown | January 24, 1982 (1982-01-24) | 924 |
| Time and Space Travel: Is it possible to travel through space faster than the speed of light and avoid aging? |||||||
| 140 | 20 | "Eva Braun" | Unknown | Unknown | February 1, 1982 (1982-02-01) | 927 |
| Eva Braun: Explores the possibility that Adolf Hitler's wife may not have died with him down in the bunker in April 1945. This episode features British historians David Irving and Hugh Trevor Roper. |||||||
| 141 | 21 | "The Walls of Jericho" | Unknown | Unknown | February 8, 1982 (1982-02-08) | 919 |
| The Walls of Jericho: The great Biblical saga is examined for evidence that the walls really did tumble down for Joshua. |||||||
| 142 | 22 | "Bishop Pike" | Unknown | Unknown | February 15, 1982 (1982-02-15) | 917 |
| Bishop Pike: Was Bishop James Pike a minister, a martyr, or a madman? |||||||
| 143 | 23 | "The Ultimate Disaster" | Unknown | Unknown | February 22, 1982 (1982-02-22) | 926 |
| Ultimate Disaster: Delves into the ultimate question—how will life on this planet perish? |||||||
| 144 | 24 | "Life Before Birth" | Unknown | Unknown | March 1, 1982 (1982-03-01) | 928 |
| Life Before Birth: Is an unborn baby aware of the world around him? |||||||

### Sci-Fi Channel revival (2002)

A revival of the series aired on The Sci-Fi Channel for one season, hosted by Mitch Pileggi.
| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 145 | 1 | "Hell/Vampires/The Tesla Death Ray/Scandinavian Lake Monsters" | Unknown | Unknown | October 4, 2002 (2002-10-04) | 1803 |
| 146 | 2 | "Witchcraft/The Man Eaters of Tsavo/The Alien Menace/Ghost Hitchhikers" | Unknown | Unknown | October 11, 2002 (2002-10-11) | 1806 |
| 147 | 3 | "Werewolves/The Curse of The Mummy/D.B. Cooper Deathbed Confession/Reincarnation" | Unknown | Unknown | October 18, 2002 (2002-10-18) | 1805 |
| 148 | 4 | "The Ghosts in Bobby Mackey's Bar/Stigmata/The Haunted Hornet/Zombies" | Unknown | Unknown | October 25, 2002 (2002-10-25) | 1801 |
| 149 | 5 | "The Catacomb Mummies/The Johnson Bigfoot Encounter/The Secret of Rennes-le-Château/Earthquake Predictions" | Unknown | Unknown | November 1, 2002 (2002-11-01) | 1802 |
| 150 | 6 | "Haunted Plantations/The Doomsday Virus/The Devil/Psychic Spies" | Unknown | Unknown | November 8, 2002 (2002-11-08) | 1804 |
| 151 | 7 | "Ghost Lovers/Exorcism & Possession/Robot Armageddon/The Haunted Campus of Ohio University" | Unknown | Unknown | November 15, 2002 (2002-11-15) | 1807 |
| 152 | 8 | "Faith Healers/The Real Frankenstein/The Shroud of Turin/Alien Ancestors" | Unknown | Unknown | November 22, 2002 (2002-11-22) | 1808 |

### History Channel revival (2018–2019)

A second revival of the series aired on The History Channel for two seasons, hosted by Zachary Quinto.

#### Season 1 (2018)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 153 | 01 | "Aliens" | Unknown | Unknown | July 20, 2018 (2018-07-20) | 1001 |
| Quinto sets out to discover whether aliens exist and what evidence we have to prove it. He meets with several people who say they have encountered extra-terrestrial life; a man who claims to have been abducted by aliens several times since childhood; a man who claims to have extracted an alien implant; and a woman who shows Zachary what it feels like to be abducted into a spacecraft. Zachary also meets with the world's leading scientists at SETI in Green Banks, West Virginia. There, utilizing the world's largest telescope, they show him the methods they employ to communicate with potential other-worldly visitors and what this research has taught them about a mysterious radio signal they picked up 3 billion light years away. |||||||
| 154 | 02 | "SuperHuman" | Unknown | Unknown | July 27, 2018 (2018-07-27) | 1002 |
| Quinto wants to understand how one can have superhuman abilities of strength, pain, and endurance. He meets a man who bent the metal frame of a car door with his bare hands in a moment of crisis, and a man who can feel no pain. He also meets with a Shaolin warrior monk who shows him some of the secrets to his training as he demonstrates breaking a wooden staff over his own head. Zachary learns to harness superhuman powers of his own through demonstrations by the monk, who in turn teaches Zachary how to break the staff as well. |||||||
| 155 | 03 | "Monsters of the Deep" | Unknown | Unknown | August 3, 2018 (2018-08-03) | 1003 |
| Quinto sets out to research the strangest creatures from the depths of the ocean and to see how much they resemble monsters that are depicted in myth and legend. Starting in Australia, he meets with a teenager who was savagely attacked by a swarm of mysterious flesh-eating monsters, only to jump into the water himself the next day among highly venomous sea creatures. From the carnivorous fish of American rivers to the eyeless monsters of the Atlantic Ocean, Zachary finds some merit in these old monster stories. |||||||
| 156 | 04 | "Artificial Intelligence" | Unknown | Unknown | August 10, 2018 (2018-08-10) | 1004 |
| Quinto embarks on a journey to understand how the future of artificial intelligence may already be a threat to humanity. He visits Facebook headquarters where he learns about a failed AI experiment when two chat boxes created a language that only they could understand. Zachary also gets a firsthand look at the world's latest technology–including life-like dolls programmed with advanced AI, robots that learn and communicate, highly intelligent drones of war, and Uber self-driving cars. |||||||
| 157 | 05 | "Time Travel" | Unknown | Unknown | August 17, 2018 (2018-08-17) | 1005 |
| Quinto charts a journey to determine whether time travel is possible. He meets a man who claims to have traveled back in time due to a secret government program and a group of people living in Liverpool known as "time slippers". Zachary then makes a visit to the CERN headquarters in Geneva, where he attempts to understand the origins of the universe and the dimension of time. Equipped with this new knowledge, Zachary tests his own perception of time with an elaborate skydiving experiment to see if he can slow down time itself. |||||||
| 158 | 06 | "Sinkholes" | Unknown | Unknown | August 24, 2018 (2018-08-24) | 1006 |
| Quinto explores the unpredictable phenomenon of sinkholes to determine just what causes them. He visits a Florida man whose brother was killed when their family home was literally swallowed whole by earth. He also visits a series of caves that are forming right below the houses of a quaint suburban neighborhood. |||||||
| 159 | 07 | "Mind Control" | Unknown | Unknown | August 31, 2018 (2018-08-31) | 1007 |
| Quinto explores the dark world of psychological mind control. He meets with a person who claims that they were surgically implanted with an electronic harassment device in his head and neck. He continues his search by examining the recent sonic attacks on American diplomats in Cuba and listens to the sound of an actual sonic weapon. In the end, he agrees to give up total control of his mind in a showdown with a mentalist. |||||||
| 160 | 08 | "Life After Death" | Unknown | Unknown | September 7, 2018 (2018-09-7) | 1008 |
| Quinto tackles the ultimate existential question as he explores what happens when we die and whether or not we can have life after death. He meets with a Texas man who actually died and came back to life after a kayaking accident. He continues his search by attempting to speak with spirits from beyond the grave with the help of a paranormal investigator who claims to possess audio and video communication with his deceased daughter. He also looks at the strange world of cryogenics at Alcor laboratories in Arizona, and uncovers a research on an anti-aging pill at Harvard University. |||||||
| 161 | 09 | "Atlantis Part 1" | Unknown | Unknown | September 14, 2018 (2018-09-14) | 1009 |
| Using a checklist derived from Plato's ancient writing as his guide, Quinto begins a journey to find the lost civilization of Atlantis and prove that it was a real empire. He begins in Greece where he dives deep into the heart of the Mediterranean Sea, looking for signs of Atlantis amongst the relics of a sunken settlement. His journey leads him to the Palace of Knossos on Crete, where he finds many alleged similarities between Atlantis and the mysterious Minoan civilization. Ultimately, he lands on the island of Sardinia, where he uncovers even more connections to Plato's checklist and possible evidence of an advanced ancient alphabet. |||||||
| 162 | 10 | "Atlantis Part 2" | Unknown | Unknown | September 14, 2018 (2018-09-14) | 1010 |
| Quinto continues his quest to find the lost civilization of Atlantis and prove that it was a real and thriving empire. On the island of Sardinia, he uncovers even more compelling evidence of an advanced civilization matching Plato's description of Atlantis -- both inside a dark cave and amongst ancient circular ruins. He then shifts his search, looking for clues about the descendants of Atlantis and their connection to the rare RH negative blood type. This ultimately leads him to a new location in Morocco, where he uncovers more connections to Plato's checklist than anywhere else he has encountered on his search. |||||||

#### Season 2 (2019)

| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code |
| 163 | 01 | "The Loch Ness Monster Part 1" | Unknown | Unknown | October 4, 2019 (2019-10-4) | 2001 |
| 164 | 02 | "The Loch Ness Monster Part 2" | Unknown | Unknown | October 11, 2019 (2019-10-11) | 2002 |
| 165 | 03 | "The Lost Colony of Roanoke" | Unknown | Unknown | October 18, 2019 (2019-10-18) | 2003 |
| 166 | 04 | "Secrets of the Bible" | Unknown | Unknown | November 1, 2019 (2019-11-1) | 2004 |
| 167 | 05 | "The Bermuda Triangle" | Unknown | Unknown | November 8, 2019 (2019-11-8) | 2005 |
| 168 | 06 | "Nazi Secrets" | Unknown | Unknown | November 15, 2019 (2019-11-15) | 2006 |
| 169 | 07 | "UFOs" | Unknown | Unknown | November 22, 2019 (2019-11-22) | 2007 |
| 170 | 08 | "The End of the World" | Unknown | Unknown | November 29, 2019 (2019-11-29) | 2008 |

## Home media releases

In February 2012, it was announced that Visual Entertainment, under license from Universal Studios, had acquired the home video rights to the original series for the United States and Canada. In Search of: The Complete Collection was released in Canada and the U.S. on December 11, 2012, from VEI's website.
The 21-DVD set includes all 144 installments hosted by Leonard Nimoy. Also included are two Rod Serling specials: In Search of Ancient Astronauts and In Search of Ancient Mysteries which aired prior to the start of the regular Nimoy series. Three Landsburg specials The Outer Space Connection (1975), Secrets of the Bermuda Triangle (1978), and Manbeast! Myth or Monster (1978), are not included. VEI also included all eight episodes of the short-lived 2002 series hosted by Mitch Pileggi.

## Homages

The style of the original In Search of... has been paid homage to and parodied by many productions. Examples include Mysteries in History, a show-within-a-show that plays a part in the plotline to Men in Black II (the faux series is hosted by Peter Graves in the film; coincidentally, Graves once co-starred with Nimoy in Mission: Impossible). Two other examples are Truth from Legend and Fact from Myth, two nearly identical series existing in alternate universes for which "mini-episodes" were created for YouTube as part of the viral marketing campaign for the two-part video game BioShock Infinite: Burial at Sea.