Pictures from the episode were released by the BBC today, as seen below:
This fifth episode of the current 13-part series will air at 8.15pm on Saturday 3rd November on BBC One.
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.
Meanwhile, episode 6 - believed to be called The Tribe - is scheduled to be broadcast on BBC One at 8.20pm on Saturday 10th November.
When Gwen is snatched from Camelot without warning, Merlin knows there can be only one person responsible: Morgana. Arthur is determined to rescue his Queen – but it's not going to be easy, for she is locked in the Dark Tower, a place that haunts the dreams of men. Arthur and his Knights must embark on a quest like no other, battling through a landscape riddled with hidden dangers, perilous obstacles, and magical beings. As they near their goal, Merlin's sense of dread reaches breaking point. What twisted game is Morgana playing? And more importantly, just what is the final test that awaits them in the tower?
UPDATE - 1st NOVEMBER: Episode 6 has now been confirmed to air at 8.05pm.
UPDATE - 3rd NOVEMBER: Episode 6 is to be called The Dark Tower, not The Tribe.