Merlin
The unlikely friendship between Merlin, a young man gifted with extraordinary magical powers, and Prince Arthur, heir to the crown of Camelot.
Season 4 · Episode 1 ·
The Darkest Hour (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.
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Episode 1 of season 4 of Merlin: “The Darkest Hour (1)”. Aired 2011-10-01. Watch it online free on ZapFlix.