الموسم 4
الصور
| # | صورة | العنوان | عُرض |
|---|---|---|---|
| 1 |  | Hitler's Secret Weapon | 05/01/1977 |
| 2 | The Hot-Blooded Dinosaurs | 12/01/1977 | |
| 3 | What Price Coal? | 19/01/1977 | |
| 4 | The Sunspot Mystery | 02/02/1977 | |
| 5 | The Plastic Prison | 09/02/1977 | |
| 6 | Incident at Brown's Ferry | 23/02/1977 | |
| 7 | Bye Bye Blackbird | 02/03/1977 | |
| 8 | The Pill for the People | 09/03/1977 | |
| 9 | The Gene Engineers | 16/03/1977 | |
| 10 | Sociobiology : The Human Animal | 23/03/1977 | |
| 11 | The Wolf Equation | 30/03/1977 | |
| 12 | The Dawn of the Solar Age | 20/04/1977 | |
| 13 | The Business of Extinction | 20/04/1977 | |
| 14 | The Red Planet | 27/04/1977 | |
| 15 | The Tongues of Men : Disaster at Babel (1) | 11/05/1977 | |
| 16 | The Tongues of Men : A World Language? (2) | 18/05/1977 | |
| 17 | Linus Pauling: Crusading Scientist | 01/06/1977 | |
| 18 | Across the Silent Barrier | 22/06/1977 | |
| 19 | The New Healers | 29/06/1977 |