Merlin
Season 4 Episode 1 - The Darkest Hour (1)
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.
Episodes in Season 4
The Darkest Hour (1)
44 min
The Darkest Hour (2)
43 min
The Wicked Day
44 min
Aithusa
43 min
His Father's Son
43 min
A Servant of Two Masters
43 min
The Secret Sharer
43 min
Lamia
43 min
Lancelot du Lac
45 min
A Herald of the New Age
43 min
The Hunter's Heart
43 min
The Sword in the Stone (1)
43 min
The Sword in the Stone (2)
44 min