VIDEO: Sneak Peek - 'With All My Heart' Episode of Syfy's MERLIN

On the next episode of the Syfy series Merlin titled "With All My Heart,' Merlin knows he must act fast before Morgana's twisted control over Gwen gets further out of hand. But only the most powerful magic can save the Queen and this will not be easy, even for Merlin.

As the High Priestess tightens her grip on Camelot, one thing is clear; she will not give up her puppet without a fight. The episode airs Friday, March 8 at 10/9c on Syfy. Get a sneak peek below!

The fourth season finds Camelot on the brink of a Golden Age of magic, mystery and action-adventure. With Morgana now a dangerous outcast, Merlin must use all his powers to ensure Arthur fulfills his destiny as the Once and Future King. Colin Morgan returns as Merlin alongside Bradley James as Prince Arthur, Angel Coulby as Gwen and Katie McGrath as Morgana. Anthony Head reprises his role as King Uther and Richard Wilson as Gaius.

The show is produced and created by the award winning team at Shine TV. FME holds the exclusive distribution, home entertainment and licensing rights to "Merlin" (known as "The Adventures of Merlin" in the rest of the world outside the US and UK) and has sold the series to over 52 broadcasters in more than 180 countries including Network Ten in Australia, MICO in Japan and RTL in Germany.