The Castle of Fyrien

S03E07 (name to change) is the seventh episode of the third series of Merlin.

Synopsis
Gwen faces an impossible dilemma when she is forced to choose between saving the lives of her estranged brother, Elyan, or Arthur, as the mystical adventure series continues. With one of them certain to die at the hands of Cenred, who will Gwen choose: the love of her life, or her only sibling? Loyalty and friendships are tested to the limit as Arthur, Merlin and Gwen work together to try to find a way out. But, with Morgana and Morgause doing all they can to scupper their plans, will good conquer evil or will Gwen lose someone she loves again?

Main Cast

 * Colin Morgan as Merlin


 * Bradley James as Arthur


 * Katie McGrath as Morgana


 * Angel Coulby as Gwen


 * Richard Wilson as Gaius


 * Anthony Head as Uther Pendragon

Recurring Cast

 * Emilia Fox as Morgause


 * Tom Ellis as Cenred

Guest Cast

 * Adetomiwa Edun as Elyan