Season 4 · Episode 1 of 13
Aired Oct 1, 2011
The Darkest Hour (1)
Sat, Oct 1, 2011
·
43 min
Streaming on Prime Video, Disney+, Amazon Freevee, Tubi TV + 7 more
0 of 13 watched this season
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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Airs
Sat, Oct 1, 2011
43 min
Show
Merlin
65 episodes
Episode
S4 · E1
in Merlin