'Arrow': Black Siren Returns In "Reversal" Photos

The CW has released new photos for 'Reversal', the upcoming fourth episode of Arrow's sixth season.

The episode will see the return of Laurel Lance/Black Siren (Katie Cassidy). It appears that the fan-favorite villain is planning some sort of attack on Star City, although it's currently unclear exactly what. But with it being the second appearance of Black Siren this season, fans can expect to find out more about what makes her tick.

"Yes, I think the more we learn about her backstory and what her relationship was like with Oliver, absolutely." Cassidy told ComicBook.com earlier this year. "I think it will make sense in the end and not necessarily make her as bad of a person. You might be like "Oh, okay that makes sense." Yes, I do think we'll know more."

And while Black Siren appears to be on the defense against Team Arrow - could viewers eventually see her redeemed?

"Yes, I do think there's a chance at redemption for her." Cassidy revealed. "I think there will be people who understand when she has the opportunity and once we learn what she's gone through, why she is the way that she is. I think people will be able to relate to it, have sympathy for her. I think there's a chance at really helping her get back to who she is at her core, and potentially not be so crazy, and have a good side to her, but I think as time goes on we'll learn that."

The episode will also see Oliver Queen (Stephen Amell) and Felicity Smoak (Emily Bett Rickards) rekindling their relationship, after taking a major step in this week's episode.

Click through our gallery below to check out the photos for 'Reversal.'

Arrow airs Thursdays at 9/8c on The CW.