Merlin - Series 3: 5. The Crystal Cave
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Series 4 Episodes
- 1. The Darkest Hour - Part 1When Morgana wrenches open the gates to the Other World, nothing will be the same again.44 mins
- 2. The Darkest Hour - Part 2With the kingdom on the brink of collapse, Arthur journeys to the Isle of the Blessed.43 mins
- 3. The Wicked DayA carnival to celebrate Prince Arthur's birthday hides a deadly foe.44 mins
- 4. AithusaA mysterious visitor arrives in Camelot seeking a very special prize: a dragon's egg.43 mins
- 5. His Father's SonFor the first time since his coronation, Arthur finds out what it's really like to be King43 mins
- 6. A Servant of Two MastersA desperate Morgana finds the unlikeliest of assassins: Merlin.43 mins
- 7. The Secret SharerMorgana joins forces with the enigmatic wizard Alator.43 mins
- 8. LamiaMerlin finds himself fighting for survival against a deadly unseen enemy.43 mins
- 9. Lancelot du LacCamelot rejoices at the return of a long-lost friend: Sir Lancelot.44 mins
- 10. A Herald of the New AgeThe discovery of a shrine in the woods unearths a haunting secret from Camelot's past.43 mins
- 11. The Hunter's HeartArthur's plans for the future are thrown into disarray by the return of Gwen.43 mins
- 12. The Sword in the Stone: Part OneArthur and Merlin must run for their lives as a merciless Morgana attacks Camelot.43 mins
- 13. The Sword in the Stone: Part TwoWith Camelot lost, Merlin goes to great lengths to restore Arthur's self-belief.43 mins