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Merlin
Series 4 Episode 2: The Darkest HourMerlin faces his toughest challenge yet when Morgana's blinkered determination threatens not only Arthur's future, but the very balance of the world. With her magic stronger than ever, the sorceress summons the mighty Callieach to tear open the veil between the worlds. Hellish creatures pour forth, killing any who succumb to their touch.
- Category
- Drama / Fantasy
- Original air date
- 2011-10-08
Cast and crew