The unlikely friendship between Merlin, a young man gifted with extraordinary magical powers, and Prince Arthur, heir to the crown of Camelot.
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The peak run. Top 40% of seasons by average rating — consecutive, with an average of 7.67.
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Colin Morgan
Merlin
Angel Coulby
Gwen
Bradley James
Arthur Pendragon
Katie McGrath
Morgana
Richard Wilson
Gaius
John Hurt
Kilgharrah (voice)
Tom Hopper
Percival
Rupert Young
Leon
All 65 episodes plotted by IMDb rating
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13 episodes • 2008Avg: 7.7Golden Era
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | The Dragon's Call | Sep 20, 2008 | 7.3 |
| 2 | Valiant | Sep 27, 2008 | 7.7 |
| 3 | The Mark of Nimueh | Oct 4, 2008 | 7.8 |
| 4 | The Poisoned Chalice | Oct 11, 2008 | 8.1 |
| 5 | Lancelot | Oct 18, 2008 | 7.8 |
| 6 | A Remedy to Cure All Ills | Oct 25, 2008 | 7.5 |
| 7 | The Gates of Avalon | Nov 1, 2008 | 7.4 |
| 8 | The Beginning of the End | Nov 8, 2008 | 7.2 |
| 9 | Excalibur | Nov 15, 2008 | 8.1 |
| 10 | The Moment of Truth | Nov 22, 2008 | 7.5 |
| 11 | The Labyrinth of Gedref | Nov 29, 2008 | 8.2 |
| 12 | To Kill the King | Dec 6, 2008 | 7.5 |
| 13 | Le Morte d'Arthur | Dec 13, 2008 | 7.6 |
13 episodes • 2009Avg: 7.6
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | The Curse of Cornelius Sigan | Sep 19, 2009 | 7.7 |
| 2 | The Once and Future Queen | Sep 26, 2009 | 7.4 |
| 3 | The Nightmare Begins | Oct 3, 2009 | 7.4 |
| 4 | Lancelot and Guinevere | Oct 10, 2009 | 7.2 |
| 5 | Beauty and the Beast (1) | Oct 24, 2009 | 6.9 |
| 6 | Beauty and the Beast (2) | Oct 31, 2009 | 7.0 |
| 7 | The Witchfinder | Nov 7, 2009 | 7.9 |
| 8 | The Sins of the Father | Nov 14, 2009 | 8.2 |
| 9 | The Lady of the Lake | Nov 21, 2009 | 7.5 |
| 10 | Sweet Dreams | Nov 28, 2009 | 7.0 |
| 11 | The Witch's Quickening | Dec 5, 2009 | 7.5 |
| 12 | The Fires of Idirsholas (1) | Dec 12, 2009 | 7.9 |
| 13 | The Last Dragonlord (2) | Dec 19, 2009 | 8.6 |
13 episodes • 2010Avg: 7.6
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | The Tears of Uther Pendragon (1) | Sep 11, 2010 | 7.8 |
| 2 | The Tears of Uther Pendragon (2) | Sep 18, 2010 | 7.7 |
| 3 | Goblin's Gold | Sep 25, 2010 | 7.6 |
| 4 | Gwaine | Oct 2, 2010 | 7.7 |
| 5 | The Crystal Cave | Oct 9, 2010 | 7.7 |
| 6 | The Changeling | Oct 16, 2010 | 6.7 |
| 7 | The Castle of Fyrien | Oct 23, 2010 | 7.2 |
| 8 | The Eye of the Phoenix | Oct 30, 2010 | 7.9 |
| 9 | Love in the Time of Dragons | Nov 6, 2010 | 6.3 |
| 10 | Queen of Hearts | Nov 13, 2010 | 7.8 |
| 11 | The Sorcerer's Shadow | Nov 20, 2010 | 7.1 |
| 12 | The Coming of Arthur (1) | Nov 27, 2010 | 8.0 |
| 13 | The Coming of Arthur (2) | Dec 4, 2010 | 8.7 |
13 episodes • 2011Avg: 7.7
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | The Darkest Hour (1) | Oct 1, 2011 | 7.9 |
| 2 | The Darkest Hour (2) | Oct 8, 2011 | 8.3 |
| 3 | The Wicked Day | Oct 15, 2011 | 8.3 |
| 4 | Aithusa | Oct 22, 2011 | 7.6 |
| 5 | His Father's Son | Oct 29, 2011 | 7.5 |
| 6 | A Servant of Two Masters | Nov 5, 2011 | 7.7 |
| 7 | The Secret Sharer | Nov 12, 2011 | 7.5 |
| 8 | Lamia | Nov 19, 2011 | 6.8 |
| 9 | Lancelot du Lac | Nov 26, 2011 | 7.5 |
| 10 | A Herald of the New Age | Dec 3, 2011 | 7.6 |
| 11 | The Hunter's Heart | Dec 10, 2011 | 7.4 |
| 12 | The Sword in the Stone (1) | Dec 17, 2011 | 8.2 |
| 13 | The Sword in the Stone (2) | Dec 24, 2011 | 8.3 |
13 episodes • 2012Avg: 7.5
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | Arthur's Bane (1) | Oct 6, 2012 | 7.7 |
| 2 | Arthur's Bane (2) | Oct 13, 2012 | 7.4 |
| 3 | The Death Song of Uther Pendragon | Oct 20, 2012 | 7.5 |
| 4 | Another's Sorrow | Oct 27, 2012 | 7.5 |
| 5 | The Disir | Nov 3, 2012 | 7.6 |
| 6 | The Dark Tower | Nov 10, 2012 | 7.4 |
| 7 | A Lesson in Vengeance | Nov 17, 2012 | 7.3 |
| 8 | The Hollow Queen | Nov 24, 2012 | 7.6 |
| 9 | With All My Heart | Dec 1, 2012 | 7.6 |
| 10 | The Kindness of Strangers | Dec 8, 2012 | 7.5 |
| 11 | The Drawing of the Dark | Dec 15, 2012 | 7.8 |
| 12 | The Diamond of the Day (1) | Dec 22, 2012 | 7.9 |
| 13 | The Diamond of the Day (2) | Dec 24, 2012 | 7.2 |
