Board Thread:WARNING - SPOILERS and FALSE INFO AHEAD/@comment-72.228.155.211-20130709095438/@comment-5690373-20130709204259

I think the darach is someone who is dead (possibly kate, matt or someone we haven't been introduced to yet). Lydia seems to have a connection to it and lets not forget that this usually happens with dead people (Peter, the hotel suicide guests). And the darach is acting through Jennifer Blake (her relation with Derek developed too fast, usually TV shows don't rush this kind of stuff, so it's weird) who is someone the chemistry teacher knew. It's an intrincate theory, I know.