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 Number 1
  • DVD Season & Episode Number
  • Absolute Episode Number
  • Originally Aired Saturday, October 1, 2011
  • Production Code
  • Directors Alice Troughton
  • Writers Julian Jones
  • Guest Stars
  • Is Movie
  • IMDB tt1952776
  • Last Updated By cremo
  • Last Updated 05/06/2019 2:23pm