Merlin Episode Ratings Heatmap
2008 · 5 Seasons · 65 Episodes · Overall Score: 7.7/10 (13 rated)
Season 1 holds the highest collective average score across the series.
Season 1 Details →Lowest score variance (σ = 0.32), maintaining an average of 7.7.
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 | Season 4 | Season 5 |
|---|---|---|---|---|---|
| Ep 1 | 7.3 | – | – | – | – |
| Ep 2 | 7.7 | – | – | – | – |
| Ep 3 | 7.8 | – | – | – | – |
| Ep 4 | 8.1 | – | – | – | – |
| Ep 5 | 7.8 | – | – | – | – |
| Ep 6 | 7.5 | – | – | – | – |
| Ep 7 | 7.4 | – | – | – | – |
| Ep 8 | 7.2 | – | – | – | – |
| Ep 9 | 8.1 | – | – | – | – |
| Ep 10 | 7.5 | – | – | – | – |
| Ep 11 | 8.2 | – | – | – | – |
| Ep 12 | 7.5 | – | – | – | – |
| Ep 13 | 7.6 | – | – | – | – |
| Season Avg | 7.7 | – | – | – | – |
Ratings Analysis & Trajectory
Across 5 seasons and 65 episodes, Merlin has earned an overall series rating of 7.7 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 11 ("The Labyrinth of Gedref"), rated at an extraordinary 8.2/10 with 15 ratings. Conversely, the lowest-rated installment is Season 1, Episode 8 ("The Beginning of the End"), landing at 7.2/10.
The most precipitous single-episode shift occurred in Season 1 between Episode 11 ("The Labyrinth of Gedref", 8.2) and Episode 12 ("To Kill the King", 7.5), a swing of 0.7 points.
Top 10 Highest Rated Episodes of Merlin
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 11 | The Labyrinth of Gedref | 8.2 | 15 | Nov 29, 2008 |
| #2 | Season 1, Ep 4 | The Poisoned Chalice | 8.1 | 17 | Oct 11, 2008 |
| #3 | Season 1, Ep 9 | Excalibur | 8.1 | 15 | Nov 15, 2008 |
| #4 | Season 1, Ep 3 | The Mark of Nimueh | 7.8 | 17 | Oct 4, 2008 |
| #5 | Season 1, Ep 5 | Lancelot | 7.8 | 17 | Oct 18, 2008 |
| #6 | Season 1, Ep 2 | Valiant | 7.7 | 18 | Sep 27, 2008 |
| #7 | Season 1, Ep 13 | Le Morte d'Arthur | 7.6 | 18 | Dec 13, 2008 |
| #8 | Season 1, Ep 6 | A Remedy to Cure All Ills | 7.5 | 17 | Oct 25, 2008 |
| #9 | Season 1, Ep 10 | The Moment of Truth | 7.5 | 15 | Nov 22, 2008 |
| #10 | Season 1, Ep 12 | To Kill the King | 7.5 | 15 | Dec 6, 2008 |