The Darkest Hour (1) - S4.E1 - Merlin
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.
The Darkest Hour (1) - S4.E1 - Merlin
October 1, 2011
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