Four promotional images from the Merlin episode “The Disir” have been released, showing Arthur, the knights, and this week’s threat to Camelot.

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The episode sees Arthur somehow manage to call down the wrath of the gods against him, and he must now fight to defend Camelot – while Merlin has his own decision to make. The official description reads:

In the inky depths of an ancient pool, three soothsayers cast a dark judgment upon the king of Camelot. But despite Merlin’s warnings, headstrong Arthur refuses to take the words of the Disir seriously, and their fury rains down on Camelot. Only the greatest sacrifice can appease them, and with the kingdom in jeopardy, is it one that Arthur is prepared to make? Faced with the king’s uncertainty, Merlin has just one chance to save him from his destiny – but this decision comes at the highest price.

What do you think Merlin will have to do to protect Arthur? It is the fifth episode of an only 13-episode long series, so we have to assume that the action is about to ramp up. We’re a bit worried for some of our characters, what about you?

You can also read an exciting preview for the episode released by SFX, which contains several new tidbits of information about the episode – but beware, it’s a bit spoilery!

Merlin 5×05 “The Disir” airs Saturday at 8:15 GMT on BBC One!