18. Sezon
Görseller
| # | Görsel | Başlık | Yayınlandı |
|---|---|---|---|
| 1 | Return to Mt. St. Helens | 8 Oca 1991 | |
| 2 | ConFusion in a Jar | 15 Oca 1991 | |
| 3 |  | The Hunt for China’s Dinosaurs | 5 Şub 1991 |
| 4 | The Case of the Flying Dinosaur | 12 Şub 1991 | |
| 5 | T. rex Exposed | 19 Şub 1991 | |
| 6 | Russian Right Stuff: The Invisible Spaceman | 26 Şub 1991 | |
| 7 | Russian Right Stuff: The Dark Side of the Moon | 27 Şub 1991 | |
| 8 | Russian Right Stuff: The Mission | 28 Şub 1991 | |
| 9 | Swimming With Whales | 5 Mar 1991 | |
| 10 | The Chip vs. the Chess Master | 26 Mar 1991 | |
| 11 | Sex, Lies and Toupee Tape | 1 Eki 1991 | |
| 12 | So You Want to Be a Doctor? | 9 Eki 1991 | |
| 13 | Secrets of the Dead Sea Scrolls | 15 Eki 1991 | |
| 14 | Suicide Mission to Chernobyl | 22 Eki 1991 | |
| 15 | Taller Than Everest? | 5 Kas 1991 | |
| 16 | Fastest Planes in the Sky | 12 Kas 1991 | |
| 17 | Avoiding the Surgeon's Knife | 3 Ara 1991 | |
| 18 | Skyscraper! | 10 Ara 1991 | |
| 19 | The Art of Faking It | 17 Ara 1991 |