Season 4, Episode 1 The Darkest Hour
First Aired: January 6, 2012
Part 1 of 2. In the Season 4 premiere, Morgana summons Callieach (Gemma Jones) to rip apart the fabric between the worlds of the living and dead, unleashing creatures that kill anyone whom they touch. Arthur and his knights set out to save the kingdom while Merlin attempts to return order to the world.
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