Board Thread:Spoilers!/@comment-24674051-20150915144108/@comment-1916997-20150915145506

So flashback will most likely have to do with her. I wonder if she will be the Lady of the Lake (aka the Siren) we saw before, or if not, be related to her. If she's involved with Merlin, maybe she's the one who becomes the first dark one. At any rate, the episode is named after her, so she's obviously important.