BBC Press Office - Programme Information (E2 synopsis):
Merlin [Series 4 Episode 2 "The Darkest Hour (part 2)"]
The kingdom is on the brink of collapse and Morgana poised to strike, in the final part of this opening episode of the fantasy drama. As Lancelot races back to Camelot with the dying Merlin, Arthur must continue on his mission to vanquish the Dorocha without them. Though the Knights know their journey to the Isle of the Blessed is fraught with danger, none could anticipate the sacrifice Arthur intends to make there.
Friendship and loyalty are tested to the limit, but in the end, it's the power of love that changes all their lives for ever.
Katie McGrath plays Morgana, Santiago Cabrera plays Sir Lancelot, Colin Morgan plays Merlin and Bradley James plays Arthur.
Merlin also stars Anthony Head as Uther Pendragon, Richard Wilson as Gaius, Angel Coulby as Gwen, Nathaniel Parker as Agravaine, John Hurt as the voice of The Dragon, Tom Hopper as Sir Percival, Eoin Macken as Sir Gwaine, Adetomiwa Edun as Sir Elyan and Rupert Young as Sir Leon.
video uploaded by cultfix
Merlin S4 E2 trailer on BBC One
Merlin S4 E2 "The Darkest Hour (part 2)" clip (Arthur, Merlin & knights)
Merlin S4 E2 "The Darkest Hour (part 2)" clip (Morgana & Agravaine)
from ITV Daybreak