A new extended trailer for the fall finale episode of season 4 of Arrow was unveiled on December 7 and it reveals some more about what is being set up as a surprising turn.

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The episode is also reportedly going to solve the mystery of who is in the grave. In the previously released promo, Felicity's (Emily Bett Rickards) life seemed to be in danger, and Darhk had taken her hostage to kill Oliver's (Stephen Amell) motivation. She is seen gasping for air in a gas chamber. Now in the extended promo, it seems like she is not the only one, Darhk pretty much is targetting anyone who is dear to Oliver, which means his entire family and crew including Thea (Willa Holland) and Diggle (David Ramsey).

Darhk threatens Oliver saying "as long as they're alive, you have something to fight for, that is what I am taking away from you."

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There have also been strong hints about the fact that the person in the grave will be revealed in the fall finale of season 4, and after watching the preview for the next episode, it seems like Felicity might be a strong candidate.

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."

"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.

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.

Watch the extended trailer for the show:

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Arrow, The cw, Television