In a new featurette for the upcoming episode, titled 'Haunted' of Arrow, executive producer Wendy Mericle gave a preview, highlighting Sara's (Caity Lotz) precarious situation.

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"We're going to see Sara out in the city doing exactly what we expected of her do, which is randomly murdering people," Mericle said. "Sara is still being inflicted by the Lazarus Pit side effects and she's still a wild, feral animal who is determined to kill and she's unstoppable. It's a very dark episode where we'll see Laurel really grappling with her decision to bring her sister back from the dead and try to put this genie back in the bottle."

She went on to talk about how Constantine (Matt Ryan) might help things from spiralling out of control.

"We're very excited that the only solution for doing that is bringing on John Constantine and he's going to be the key to bringing Sara back and bringing her soul back," Mericle adds. "We feel very lucky, Constantine is a favorite character of the comic book fans watching our show and it's just a fun, different dynamic to have on the show."

Laurel (Katie Cassidy) is also going to be in a sticky situation with Oliver (Stephen Amell) who is not happy about her having brought her sister back from the dead because of the hazardous consequences.

The episode will air on Nov. 4 at 8 p.m. ET/PT on The CW.

Watch the featurette:

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Arrow, The cw, Television