Episodes(13)
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The Darkest Hour - Part 1 (S04E01)
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The Darkest Hour - Part 2 (S04E02)
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The Wicked Day (S04E03)
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Aithusa (S04E04)
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His Father's Son (S04E05)
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A Servant of Two Masters (S04E06)
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The Secret Sharer (S04E07)
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Lamia (S04E08)
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Lancelot du Lac (S04E09)
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A Herald of the New Age (S04E10)
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The Hunter's Heart (S04E11)
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The Sword in the Stone: Part One (S04E12)
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The Sword in the Stone: Part Two (S04E13)
Plots(1)
Merlin is back for a fourth series of the hit BBC adventure as Camelot stands on the brink of a golden age. But its birth will not be an easy one. For the forces of evil are gathering and the darkest hour is just before the dawn. This series sees the arrival of the fearless Knights of Camelot and a fantastic guest cast featuring Gemma Jones, Phil Davis and Nathaniel Parker as well as the return of Santiago Cabrera as the dashing Lancelot. With its thrilling mix of action, adventure and pure magic, the fourth series of Merlin will captivate the imagination as never before. (Fremantle Home Entertainment)
(more)Gallery (156)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Eoin Macken, Tom Hopper, Santiago Cabrera](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275183_cfeb85.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Emilia Fox, Katie McGrath, James Greene](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275184_8ff79e.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Rupert Young, Tomiwa Edun, Eoin Macken, Tom Hopper, Santiago Cabrera](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275187_157b4d.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - James Greene](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275188_0b7f1d.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Rupert Young, Tomiwa Edun, Eoin Macken, Tom Hopper, Santiago Cabrera](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275191_47a044.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Emilia Fox](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275192_e1100a.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Bradley James, Nathaniel Parker](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275194_02f3ff.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Emilia Fox](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275195_3c4d38.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Katie McGrath](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275197_bdfc02.jpg)
The Darkest Hour - Part 1 (S04E01)
Photo © British Broadcasting Corporation (BBC) / Nick Briggs
![Merlin - Season 4 - The Darkest Hour - Part 1 - Photos - Tom Hopper, Bradley James](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/160/275/160275198_655e2a.jpg)