'Arrow': The CW releases photos of upcoming episode 'The Demon', hints at Dinah-Laurel partnership and an 'unlikely ally'
The title 'The Demon' for the upcoming episode refers to a mysterious inmate at Slabside Maximum Security Prison in this season of The CW's 'Arrow'

The CW has released photos for the November 12 episode of 'Arrow' titled 'The Demon', according to a report by ComicBook.
Fans of the series had been speculating that this episode ties with Ra's al Ghul (Matthew Nable) and the League of Assasins when the titled was first announced. However, that speculation doesn't seem to be true. The word Demon in the title refers to a mysterious inmate at Slabside Maximum Security Prison this season. From what we saw in the latest episode 'Level Two' (Oliver's 'therapy' sessions and not so therapeutic), this inmate could be a real trouble for Oliver Queen (Stephen Amell).
You can find the photos on ComicBook, here.