All five series of the BBC drama set in the mythical city of Camelot which tells the tale of the extraordinary relationship between the young King Arthur (Bradley James) and Merlin (Colin Morgan), the wise sorcerer who guides him to power and beyond. Series 1 episodes are: \'The Dragon\'s Call\', \'Valiant\', \'The Mark of Nimueh\', \'The Poisoned Chalice\', \'Lancelot\', \'The Gates of Avalon\', \'The Beginning of the End\', \'Excalibur\', \'The Moment of Truth\', \'The Labyrinth of Gedre\', \'To Kill the King\' and \'Le Morte d\'Arthur\'. Series 2 episodes are: \'The Curse of Cornelius Sigan\', \'The Once and Future Queen\', \'The Nightmare Begins\', \'Lancelot and Guinevere\', \'Beauty and the Beast: Part 1\', \'Beauty and the Beast: Part 2\', \'The Witchfinder\', \'The Sins of the Father\', \'The Lady of the Lake\', \'Sweet Dreams\', \'The Witch\'s Quickening\', \'The Fires of Idirsholas\' and \'The Last Dragonlord\'. Series 3 episodes are: \'The Tears of Uther Pendragon: Part 1\', \'The Tears of Uther Pendragon: Part 2\', \'Goblin\'s Gold\', \'Gwaine\', \'The Crystal Cave\', \'The Changeling\', \'The Castle of Fyrien\', \'The Eye of the Phoenix\', \'Love in the Time of Dragons\', \'Queen of Hearts\' and \'The Sorcerer\'s Shadow\'. Series 4 episodes are: \'The Darkest Hour\', \'The Darkest Hour: Part 2\', \'The Wicked Day\', \'Aithusa\', \'His Father\'s Son\', \'A Servant of Two Masters\', \'The Secret Sharer\', \'Lamia\', \'Lancelot du Lac\', \'A Herald of the New Age\', \'The Hunter\'s Heart\', \'The Sword in the Stone: Part 1\' and \'The Sword in the Stone: Part 2\'. Series 5 episodes are: \'Arthur\'s Bane: Part 1\', \'Arthur\'s Bane: Part 2\', \'The Death Song of Uther Pendragon\', \'Another\'s Sorrow\', \'The Disir\', \'The Dark Tower\', \'A Lesson in Vengeance\', \'The Hollow Queen\', \'With All My Heart\', \'The Kindness of Strangers\', \'The Drawing of the Dark\', \'The Diamond of the Day: Part 1\' and \'The Diamond of the Day: Part 2\'.