In the next episode of "Arrow," Black Siren a.k.a. Laurel Lance (Katie Cassidy) threatens the citizens of Star City once again.

The trailer for the upcoming installment titled "Reversal" was released just recently and showed Lance dressed in a black dress and picking up a guy at a bar. Moments later, however, she kills him in a hallway after having a nice date. "Evil Laurel seduced a guy and then killed him," Curtis Holt a.k.a. Mr. Terrific (Echo Kellum) tells the team. Oliver Queen a.k.a. Green Arrow (Stephen Amell) is baffled by Lance's actions and asks, "What do you guys think? Black Siren turned Black Widow?" Lance appears to be stepping up her attacks against key targets in Star City. She uses her high-frequency screams to take down some guards in a secret facility. She then uses her fighting skills to subdue the rest of them.

Lance meets Arrow who is actually Queen's temporary replacement, John Diggle (David Ramsey). "You've changed something about yourself. I just can't put my finger on it," Black Siren says about Arrow. Diggle has to be careful so as not to reveal himself, otherwise Lance could use Queen's secret against him. Nevertheless, it remains to be seen if Lance will eventually discover the team's secret.

In a recent interview with EW, Emily Bett Rickards, who plays Felicity Smoak, said that she will experience some challenges that will prompt her to face things alone in the coming episode. "She refuses the team's help for 75 percent of it... Felicity doing that doesn't always end up in her favor and is also nearsighted. It has to do with stealing some tech. It is one of my favorite episodes ever," said Rickards.

"Arrow" season 6 episode 4 will hit the airwaves on Thursday, Nov. 2 at 9 p.m. EDT on The CW.