S4·E1 The Darkest Hour (1)
Synopsis
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.
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Frequently Asked Questions
When did Season 4 Episode 1 of Merlin air?
Season 4, Episode 1 ('The Darkest Hour (1)') originally aired on October 1, 2011.
How long is Season 4 Episode 1 ('The Darkest Hour (1)')?
The episode follows the standard broadcast runtime for Merlin.
What happens in Merlin Season 4 Episode 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....