Leonard Nimoy hosts investigations into various mysteries.
4 - 1Tidal Waves Sep. 20, 1979- 4 - 2Carlos, the Most Wanted Man in the World Sep. 27, 1979
- 4 - 3The Amityville Horror Oct. 04, 1979
- 4 - 4UFO Australia Oct. 11, 1979
- 4 - 5Immortal Sharks Oct. 18, 1979
- 4 - 6The Lost Colony of Roanoke Oct. 25, 1979
- 4 - 7The Shroud of Turin Nov. 08, 1979
- 4 - 8Mexican Pyramids Nov. 15, 1979
- 4 - 9The Abominable Snowman Nov. 22, 1979
- 4 - 10Pompeii Nov. 29, 1978
- 4 - 11D.B. Cooper Dec. 06, 1979
- 4 - 12The Ten Commandments (aka Mount Sinai) Dec. 13, 1979
- 4 - 13The Dark Star (aka The Dogons) Dec. 20, 1979
- 4 - 14The San Andreas Fault Dec. 27, 1979
- 4 - 15The Missing Heir Jan. 03, 1980
- 4 - 16Vincent Van Gogh Jan. 10, 1980
- 4 - 17Wild Children Jan. 17, 1980
- 4 - 18The Ghost Ship (aka Mary Celeste) Jan. 24, 1980
- 4 - 19Earth Visitors Jan. 31, 1980
- 4 - 20John the Baptist Feb. 07, 1980
- 4 - 21Air Disaster Prediction Feb. 14, 1980
- 4 - 22The Bimini Wall Feb. 21, 1980
- 4 - 23Glenn Miller Mar. 07, 1980
- 4 - 24Past Lives Mar. 14, 1980