 
     
        Merlin is bac for a fourth series, with Camelot standing 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...
| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | The Darkest Hour (1) | October 1, 2011 BBC One | 44 | |
| S04E02 | The Darkest Hour (2) | October 8, 2011 BBC One | 43 | |
| S04E03 | The Wicked Day | October 15, 2011 BBC One | 44 | |
| S04E04 | Aithusa | October 22, 2011 BBC One | 43 | |
| S04E05 | Lamia | November 19, 2011 BBC One | 43 | |
| S04E05 | The Secret Sharer | November 12, 2011 BBC One | 43 | |
| S04E05 | A Servant of Two Masters | November 5, 2011 BBC One | 43 | |
| S04E05 | His Father's Son | October 29, 2011 BBC One | 43 | |
| S04E06 | Lancelot du Lac | November 26, 2011 BBC One | 44 | |
| S04E07 | A Herald of the New Age | December 3, 2011 BBC One | 43 | |
| S04E08 | The Hunter's Heart | December 10, 2011 BBC One | 43 | |
| S04E09 | The Sword in the Stone (1) | December 17, 2011 BBC One | 43 | |
| S04E10 | The Sword in the Stone (2) season finale | December 24, 2011 BBC One | 43 | 
No artwork of this type.
No artwork of this type.
No artwork of this type.