Episode 5.12 - synopsis and airdate (spoilers)
Contains spoilers!
From BBC Media Centre, CultBox and Den of Geek: Episode Title: The Diamond of the Day, Part 1
Ep 12/13
Saturday 22 December
Time 7.55pm
BBC ONE
[Click for spoiler synopsis]
High in the mountains, a great horde gathers; Morgana prepares for war with a vengeful Mordred at her side.
Merlin feels the weight of his destiny like never before as the ancient prophecies play out with terrifying accuracy. But before he can save his beloved Camelot, he must save himself. For it is not just the kingdom Morgana wishes to destroy - it is also Emrys.
Do not miss this penultimate episode in the epic final series of Merlin.
Colin Morgan is Merlin, Bradley James is Arthur, Angel Coulby is Gwen, Katie McGrath is Morgana, Richard Wilson is Gaius, John Hurt is the voice of the Great Dragon, Alexander Vlahos is Mordred and Tom Hopper, Rupert Young, and Eoin Macken are The Knights of the Round Table.