Aired
October 01, 2011
Merlin
Merlin
The Darkest Hour (1) #S04E01
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.
Episode 1 of Season 4 from Merlin — available to stream in HD on any device.
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