First look stills from the fall finale of season 4 of Arrow were revealed via TVLine and this episode is going to address the most anticipated mystery of this chapter.

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Judging by the pictures, in one of which, Oliver (Stephen Amell) looks stunned beyond repair, TVLine speculates that the person in the grave will be revealed in this episode.

There could actually be some truth to this, as previously in an interview with TVLine, Arrow's executive producer Wendy Mericle spoke about when fans might find out about the person in the grave in season 4. Mericle didn't give a definite timeline, only teasing the possible reveals suggesting that there might be more flash-forwards "here and there... right around midseason."

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"We're definitely toying with that," Mericle said, "and when and if we do decide to do that, it will reveal even more pertinent information about not who's going to be in the grave but certainly where our characters are when that [death] happens." she added.

Damien Darhk will strike in this episode, titled 'Dark Waters.'

Here's the official synopsis:

"After the city is attacked again, Oliver (Stephen Amell) makes a bold move against HIVE. Malcolm (John Barrowman) checks in on Thea (Willa Holland) andleaves her with a warning. Things take a horrible turn when Damien Darhk (guest star Neal McDonough) retaliates in a brutal manner at Oliver's mayoral holiday party."

'Dark Waters' will air on December 9 on The CW.

Here's the preview for the latest episode, 'The Legends of Yesterday':

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Arrow, The cw, Television