| 21 | Confronting the Killer Gene | Mar. 28, 1989 |
| 20 | The World Is Full of Oil! | Mar. 21, 1989 |
| 19 | Legends of Easter Island: Part 2 | Mar. 7, 1989 |
| 18 | Secrets of Easter Island: Part 1 | Mar. 7, 1989 |
| 17 | Adrift on the Gulf Stream | Feb. 28, 1989 |
| 16 | God, Darwin and the Dinosaurs | Feb. 21, 1989 |
| 15 | Back to Chernobyl | Feb. 14, 1989 |
| 14 | The Strange New Science of Chaos | Jan. 31, 1989 |
| 13 | The Last Journey of a Genius | Jan. 24, 1989 |
| 12 | Hot Enough for You? | Jan. 17, 1989 |
| 11 | Can We Make a Better Doctor? | Dec. 13, 1988 |
| 10 | The All-American Bear | Dec. 6, 1988 |
| 9 | The Light Stuff | Nov. 22, 1988 |
| 8 | Who Shot President Kennedy? | Nov. 15, 1988 |
| 7 | Do Scientists Cheat? | Oct. 25, 1988 |
| 6 | Can the Next President Win the Space Race? | Oct. 11, 1988 |
| 5 | Can the Vatican Save the Sistine Chapel? | Oct. 4, 1988 |
| 4 | Pioneers of Surgery: Beyond the Knife (4) | Sep. 27, 1988 |
| 3 | Pioneers of Surgery: New Organs for Old (3) | Sep. 20, 1988 |
| 2 | Pioneers of Surgery: Into the Heart (2) | Sep. 13, 1988 |
| 1 | Pioneers of Surgery: The Brutal Craft (1) | Sep. 6, 1988 |