'Merlin': 'The Sword in the Stone (Part 1)' in pictures
Once more, the kingdom is under siege, with wicked sorceress Morgana (Katie McGrath) and the warlord Helios (Terence Maynard) leading a mighty army! Only Merlin (Colin Morgan) stands in their way - but will matters of the heart distract the young warlock from his destiny?
Merlin continues this Saturday at 8.10pm on BBC One.
> Merlin: 'The Hunter's Heart' recap
Take a look at a gallery of images from this week's Merlin below:
Copyright: BBC Shine/Nick Briggs