Episode 2 airs at 8.05pm on Saturday 8th October on BBC One: “The kingdom is on the brink of collapse and Morgana poised to strike. As Lancelot races back to Camelot with the dying Merlin, Arthur must continue on his mission to vanquish the Dorocha without them.”

> Order the Series 4 Volume 1 DVD on Amazon.

Watch the Series 4 trailer, with an exclusive introduction by Nathaniel Parker for CultBox…