The fourth series of Merlin comes to a dramatic conclusion this Saturday and it’s everything you’d hope for in a finale. Here’s our 20 teasers.

1. The Great Dragon makes two separate appearances, but Aithusa is not in either…
2. “Everything I cherished between us, everything we had – it’s gone. That’ll never change”
3. Agravaine learns the hard way
4. “I came back because you’re the only friend I have and I couldn’t bear to lose you…”
5. Merlin tells Arthur a very important bedtime story
6. “You and you alone can restore *** ****’s *****”
7. Old Emrys plays a small, but vital role in the final battle
8. “I’m not long for this world…”
9. Merlin has fresh blood on his hands
10. Arthur is very fond of his new toy
11. Morgana gains a surprising new ally
12. She should have checked under the bed
13. “What happened to you Morgana? I thought we were friends”
14. “I’m going to enjoy killing you, Arthur Pendragon. Not even Emrys can save you now”
15. Gwen and Morgana’s confrontation is short and swift
16. “You’ve made it perfectly clear about how you feel about me and my kind”
17. “**** *** ***** **?”
18. Two characters won’t make it out of the finale alive
19. “So it’s you! You’re Emrys!”
20. Merlin has made a really terrible mistake earlier in this series. One that is going to come cause him trouble in Series 5…

The Sword in the Stone: Part 2 airs 24 December at 8pm on BBC1