Merlin

Season 4 Episode 1

The Darkest Hour Part 1

17
Aired Unknown Oct 01, 2011 on BBC
7.0
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269 votes

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Episode Summary

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Merlin is to face his toughest challenge yet when Morgana's blind determination puts at risk Arthur's future as well as the very balance of the world. With her unbounded powers at their highest, the sorceress uses powerful magic to tear the mystical veil between worlds making the mighty Cailleach to come forth.

Hellish creatures are released and wander around, killing everyone who succumbs to their touch. With Uther but a mere shadow of his former self, it comes down to Arthur and his loyal knights to safeguard the kingdom.

However, swords won't be enough to vanquish the newest threat and Merlin is utterly shocked to find out what it'll take to restore the equilibrium of the world: a sacrifice of unimaginable proportions is required.

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Gemma Jones

Gemma Jones

The Cailleach

Guest Star

Zee Asha

Zee Asha

Audrey

Guest Star

James Greene

James Greene

Ferryman

Guest Star

Rupert Young

Rupert Young

Sir Leon

Recurring Role

Eoin Macken

Eoin Macken

Sir Gwaine

Recurring Role

John Hurt

John Hurt

Voice of the Great Dragon

Recurring Role

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