Watch Merlin S04E12
The Sword in the Stone: Part One
Morgana is now the head of a vast Southron army and a deadly net is closing around Camelot. After the sorceress strikes everyone is forced to run for their lives including Arthur. It is down to Merlin to try and save Arthur from Morgana's clutches. . You can watch Merlin S04E12 here.
Air date: December 17, 2011 on BBC One at 7:30 PM
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Watch Merlin S04E13 - The Sword in the Stone: Part Two
Season 4 Episode 13
Air date: December 24, 2011 on BBC One