Season
Season 5 Episode
- Season 4 The Darkest Hour (1)
- Season 4 The Darkest Hour (2)
- Season 4 The Wicked Day
- Season 4 Aithusa
- Season 4 His Father's Son
- Season 4 A Servant of Two Masters
- Season 4 The Secret Sharer
- Season 4 Lamia
- Season 4 Lancelot du Lac
- Season 4 A Herald of the New Age
- Season 4 The Hunter's Heart
- Season 4 The Sword in the Stone (1)
- Season 4 The Sword in the Stone (2)
Merlin - Season 4 Episode 1 The Darkest Hour (1)
7.84 43 minutes Evil sorceress Morgana summons mighty gatekeeper the Cailleach, who opens a door to another world from which hellish creatures pour forth. As Arthur and his loyal knights take up arms, Merlin discovers the only thing that will stop them is an unimaginable sacrifice.
