Season 1 (1979)
8.75 avg 13 episodes 8.7 → 8.6 55 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Infinite Variety | 8.7 | 130 |
| 2 | Building Bodies | 8.6 | 104 |
| 3 | The First Forests | 8.8 | 99 |
| 4 | The Swarming Hordes | 8.6 | 99 |
| 5 | The Conquest of the Waters | 8.6 | 95 |
| 6 | Invasion of the Land | 8.9 | 90 |
| 7 | Victors of the Dry Land | 8.7 | 90 |
| 8 | Lords of the Air | 8.7 | 89 |
| 9 | The Rise of the Mammals | 8.8 | 90 |
| 10 | Theme and Variations | 9.0 | 83 |
| 11 | The Hunters and Hunted | 8.8 | 88 |
| 12 | Life in the Trees | 8.9 | 92 |
| 13 | The Compulsive Communicators | 8.6 | 86 |