Star Trek Episode Ratings Heatmap
1966 · 3 Seasons · 79 Episodes · Overall Score: 7.2/10 (79 rated)
Season 2 holds the highest collective average score across the series.
Season 2 Details →Lowest score variance (σ = 0.53), maintaining an average of 6.9.
Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
| Episode | Season 1 | Season 2 | Season 3 |
|---|---|---|---|
| Ep 1 | 7.0 | 8.4 | 6.1 |
| Ep 2 | 6.7 | 6.7 | 7.9 |
| Ep 3 | 7.1 | 7.6 | 6.6 |
| Ep 4 | 7.3 | 8.5 | 5.8 |
| Ep 5 | 7.3 | 6.7 | 7.1 |
| Ep 6 | 6.5 | 8.1 | 6.8 |
| Ep 7 | 7.2 | 6.2 | 7.5 |
| Ep 8 | 6.9 | 7.3 | 7.1 |
| Ep 9 | 6.9 | 7.1 | 7.5 |
| Ep 10 | 7.5 | 8.1 | 6.9 |
| Ep 11 | 7.8 | 6.8 | 7.4 |
| Ep 12 | 7.8 | 7.4 | 6.5 |
| Ep 13 | 6.8 | 7.1 | 6.9 |
| Ep 14 | 8.4 | 7.1 | 6.9 |
| Ep 15 | 6.6 | 8.5 | 7.4 |
| Ep 16 | 7.4 | 7.1 | 6.7 |
| Ep 17 | 7.0 | 7.5 | 6.6 |
| Ep 18 | 7.3 | 7.5 | 6.6 |
| Ep 19 | 7.5 | 7.1 | 7.2 |
| Ep 20 | 7.3 | 7.5 | 6.2 |
| Ep 21 | 7.2 | 7.7 | 7.1 |
| Ep 22 | 8.4 | 7.6 | 6.6 |
| Ep 23 | 7.8 | 6.3 | 7.9 |
| Ep 24 | 7.6 | 8.0 | 7.1 |
| Ep 25 | 7.9 | 7.0 | – |
| Ep 26 | 8.0 | 7.4 | – |
| Ep 27 | 5.6 | – | – |
| Ep 28 | 8.6 | – | – |
| Ep 29 | 7.1 | – | – |
| Season Avg | 7.3 | 7.4 | 6.9 |
Ratings Analysis & Trajectory
Across 3 seasons and 79 episodes, Star Trek has earned an overall series rating of 7.2 out of 10. The series displays remarkable consistency across its narrative arc, maintaining reliable ratings from premiere to conclusion.
The single highest-rated hour of television in the series is Season 1, Episode 28 ("The City on the Edge of Forever"), rated at an extraordinary 8.6/10 with 68 ratings. Conversely, the lowest-rated installment is Season 1, Episode 27 ("The Alternative Factor"), landing at 5.6/10.
The most precipitous single-episode shift occurred in Season 1 between Episode 26 ("Errand of Mercy", 8) and Episode 27 ("The Alternative Factor", 5.6), a swing of 2.4 points.
Top 10 Highest Rated Episodes of Star Trek
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 28 | The City on the Edge of Forever | 8.6 | 68 | Apr 6, 1967 |
| #2 | Season 2, Ep 4 | Mirror, Mirror | 8.5 | 62 | Oct 6, 1967 |
| #3 | Season 2, Ep 15 | The Trouble With Tribbles | 8.5 | 56 | Dec 29, 1967 |
| #4 | Season 1, Ep 14 | Balance of Terror | 8.4 | 65 | Dec 15, 1966 |
| #5 | Season 1, Ep 22 | Space Seed | 8.4 | 61 | Feb 16, 1967 |
| #6 | Season 2, Ep 1 | Amok Time | 8.4 | 60 | Sep 15, 1967 |
| #7 | Season 2, Ep 6 | The Doomsday Machine | 8.1 | 61 | Oct 20, 1967 |
| #8 | Season 2, Ep 10 | Journey to Babel | 8.1 | 51 | Nov 17, 1967 |
| #9 | Season 1, Ep 26 | Errand of Mercy | 8.0 | 55 | Mar 23, 1967 |
| #10 | Season 2, Ep 24 | The Ultimate Computer | 8.0 | 47 | Mar 8, 1968 |