On a hunt with his fellow knights, Mordred (Alexander Vlahos) stumbles across an old friend - Kara (Alexandra Dowling) - and finds his loyalty to Arthur (Bradley James) tested...
Relentlessly pursued by a suspicious Merlin (Colin Morgan), Mordred is torn between love and duty - will the tormented warlock emerge from this crisis untainted or is he doomed to a dark fate?
Merlin continues on BBC One this Saturday (December 15) at at 8.15pm.
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1. "Your doom is near!"
2. Expect a series-best performance from the fantastic Alexander Vlahos.
3. "It is you and Camelot who shall pay the price."
4. Prepare to have your sympathies divided - we didn't always side with Merlin this week.
5. "He's beguiled you - he's beguiled you all!"
6. Merlin compares himself to a swan, while Arthur offers up a less flattering comparison.
7. "You're a druid - you don't belong in Camelot."
8. Will Arthur be doomed by his own actions?
9. "I've made a terrible mistake, haven't I?"
10. The final scene will leave Merlin fans across the land with jaws agape.
Are you excited for the next episode of Merlin? Let us know below!