18 - 1Return to Mt. St. Helens Jan. 08, 1991- 18 - 2ConFusion in a Jar Apr. 30, 1991
- 18 - 3The Chip vs. the Chess Master Mar. 26, 1991
- 18 - 4The Hunt for China's Dinosaurs (1) Feb. 05, 1991
- 18 - 5Case of the Flying Dinosaur Feb. 12, 1991
- 18 - 6T. rex Exposed Feb. 19, 1991
- 18 - 7The Russian Right Stuff: The Invisible Spaceman Feb. 26, 1991
- 18 - 8The Russian Right Stuff: The Dark Side of the Moon Feb. 27, 1991
- 18 - 9The Russian Right Stuff: The Mission Feb. 28, 1991
- 18 - 10In the Land of the Llamas Dec. 04, 1990
- 18 - 11Sex, Lies and Toupee Tape Oct. 01, 1991
- 18 - 12So You Want to Be a Doctor? Oct. 09, 1991
- 18 - 13Secrets of the Dead Sea Scrolls Oct. 15, 1991
- 18 - 14Suicide Mission to Chernobyl Oct. 22, 1991
- 18 - 15Taller Than Everest? Nov. 05, 1991
- 18 - 16Fastest Planes in the Sky Nov. 12, 1991
- 18 - 17Avoiding the Surgeon's Knife Dec. 03, 1991
- 18 - 18Skyscraper! A NOVA Special Dec. 10, 1991
- 18 - 19The Fine Art of Faking It Dec. 17, 1991
