The Darkest Hour (1) (S04E01)
S04E01
The wicked sorceress Morgana calls upon the powerful gatekeeper, the Cailleach, who unseals a portal to a nightmarish realm, unleashing terrifying creatures into their world. As Arthur and his devoted knights prepare for battle, Merlin uncovers a chilling truth: the only way to halt the chaos is through an unfathomable sacrifice.
Show
Merlin (2008)
Episode
S04E01
Air Date
Oct 01, 2011
Season 4 Episodes
S04E01
The Darkest Hour (1)
S04E02
The Darkest Hour (2)
S04E03
The Wicked Day
S04E04
Aithusa
S04E05
His Father's Son
S04E06
A Servant of Two Masters
S04E07
The Secret Sharer
S04E08
Lamia
S04E09
Lancelot du Lac
S04E10
A Herald of the New Age
S04E11
The Hunter's Heart
S04E12
The Sword in the Stone (1)
S04E13
The Sword in the Stone (2)