After disturbing an ancient shrine, Elyan has been possessed by a tormented spirit and can no longer be trusted. Once again, Arthur's life is under threat and this time, one of his own trusted knights is the would-be assassin!
Merlin continues this Saturday at 8pm on BBC One.
> Merlin: 'Lancelot du Lac' recap
Check out Digital Spy's ten teasers for this week's Merlin below:
1. If you're easily scared by a creepy child, then this might be one to miss!
2. "For once, I'm not lying to you."
3. Elyan is knocked out twice - by two of his fellow knights!
4. "Why have you got stew in your hair?"
5. Following her banishment, there's no sign of Gwen this week.
6. "Merlin will feel that in his arms tomorrow."
7. One character is haunted by a sin from the past.
8. "Would you like me to make up the bed, sire, or will you be ******** on the ***** again?"
9. Merlin wants a hug from the King.
10. "I have to pee all the time. Ask Arthur - I'm always peeing."
What do you make of our teasers? Let us know below!