Season Five

With All My Heart

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The warlock is determined to break Morgana's twisted control over Gwen. But it will be no easy task, even for Merlin, as only the most powerful magic can save the Queen -- and the high priestess will not give up her puppet without a fight. (TV Guide UK)
U.S. air dates are in MM.DD.YY form.   U.K. air dates are in DD.MM.YY form.