Watch Merlin – Season 4 Episode 1: The Darkest Hour (1)
Cast: Colin Morgan , Angel Coulby , Bradley James , Katie McGrath , Richard Wilson , John Hurt , Tom Hopper , Rupert Young
Directors: Jake Michie , Johnny Capps , Julian Murphy , Julian Jones
Watch Merlin – S4E1
Episode Overview
Evil sorceress Morgana summons mighty gatekeeper the Cailleach, who opens a door to another world from which hellish creatures pour forth. As Arthur and his loyal knights take up arms, Merlin discovers the only thing that will stop them is an unimaginable sacrifice.
