Season 1 (1970)
6.81 avg 26 episodes 7.3 → 7.1 26 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Wrong End of Time: Part 1 | 7.3 | 41 |
| 2 | The Wrong End of Time: Part 2 | 7.0 | 28 |
| 3 | The Wrong End of Time: Part 3 | 7.0 | 26 |
| 4 | The Wrong End of Time: Part 4 | 6.8 | 25 |
| 5 | The Wrong End of Time: Part 5 | 7.1 | 24 |
| 6 | The Wrong End of Time: Part 6 | 6.8 | 25 |
| 7 | The Time of the Ice Box: Part 1 | 6.9 | 18 |
| 8 | The Time of the Ice Box: Part 2 | 7.0 | 14 |
| 9 | The Time of the Ice Box: Part 3 | 6.9 | 14 |
| 10 | The Time of the Ice Box: Part 4 | 6.9 | 13 |
| 11 | The Time of the Ice Box: Part 5 | 6.9 | 13 |
| 12 | The Time of the Ice Box: Part 6 | 6.6 | 14 |
| 13 | The Year of the Burn Up: Part 1 | 6.8 | 14 |
| 14 | The Year of the Burn Up: Part 2 | 6.4 | 11 |
| 15 | The Year of the Burn Up: Part 3 | 6.4 | 11 |
| 16 | The Year of the Burn Up: Part 4 | 6.2 | 11 |
| 17 | The Year of the Burn Up: Part 5 | 6.2 | 11 |
| 18 | The Year of the Burn Up: Part 6 | 6.5 | 11 |
| 19 | The Year of the Burn Up: Part 7 | 6.6 | 11 |
| 20 | The Year of the Burn Up: Part 8 | 6.6 | 11 |
| 21 | The Day of the Clone: Part 1 | 7.0 | 14 |
| 22 | The Day of the Clone: Part 2 | 7.2 | 11 |
| 23 | The Day of the Clone: Part 3 | 6.9 | 11 |
| 24 | The Day of the Clone: Part 4 | 7.0 | 11 |
| 25 | The Day of the Clone: Part 5 | 7.0 | 11 |
| 26 | The Day of the Clone: Part 6 | 7.1 | 12 |