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The Season 3 finale finds Camelot crumbling under the control of Queen Morgana and Morgause's immortal army. While Arthur, Lancelot, Elyan and Percival prepare a counterattack, Merlin rushes to retrieve the Excalibur sword from the Lake of Avalon. (TV Guide)
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.