Season 4, Episode 2 The Darkest Hour

First Aired: January 13, 2012

Conclusion. Lancelot rushes the dying Merlin to Camelot in hopes that Gaius can save him, but their journey is interrupted by strange creatures called Vilia. Arthur, meanwhile, continues his mission to vanquish the Dorocha.

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Guest Cast

Michael Cronin Geoffrey of Monmouth
Tom Hopper Sir Percival
Eoin Macken Sir Gwaine
Santiago Cabrera Sir Lancelot