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| Aflevering | Eerste uitzending |
|---|---|
| S18E01 - Return to Mt. St. Helens | 08/01/1991 |
| S18E02 - ConFusion in a Jar | 15/01/1991 |
| S18E03 - The Hunt for China’s Dinosaurs | 05/02/1991 |
| S18E04 - The Case of the Flying Dinosaur | 12/02/1991 |
| S18E05 - T. rex Exposed | 19/02/1991 |
| S18E06 - Russian Right Stuff: The Invisible Spaceman | 26/02/1991 |
| S18E07 - Russian Right Stuff: The Dark Side of the Moon | 27/02/1991 |
| S18E08 - Russian Right Stuff: The Mission | 28/02/1991 |
| S18E09 - Swimming With Whales | 05/03/1991 |
| S18E10 - The Chip vs. the Chess Master | 26/03/1991 |
| S18E11 - Sex, Lies and Toupee Tape | 01/10/1991 |
| S18E12 - So You Want to Be a Doctor? | 09/10/1991 |
| S18E13 - Secrets of the Dead Sea Scrolls | 15/10/1991 |
| S18E14 - Suicide Mission to Chernobyl | 22/10/1991 |
| S18E15 - Taller Than Everest? | 05/11/1991 |
| S18E16 - Fastest Planes in the Sky | 12/11/1991 |
| S18E17 - Avoiding the Surgeon's Knife | 03/12/1991 |
| S18E18 - Skyscraper! | 10/12/1991 |
| S18E19 - The Art of Faking It | 17/12/1991 |