It's the beginning of the end.

After a dark and tense episode which saw Mordred's former lover hung by Arthur, the mysterious druid switched sides and ran back to Morgana. Now, with Mordred on her side, she knows Merlin's true identity and nothing stands in her way... 

As the two-part finale kicks off, Morgana wages war on Camelot and the prophecies look as though they are going to come true. Is there anything Merlin can do to save Arthur and the future of the kingdom?

Watch trailers for the final episodes of Merlin

The adventure continues on 22 December at 7:55pm on BBC1