Rumor has it that Barbara Kean (Erin Richards) will turn into Harley Quinn in “Gotham” Season 3. Fox

Where is Harley Quinn? This seems to be the question “Gotham” fans are asking now that the show is expecting its Season 3 finale next week.

“Gotham” producers have long teased that the villain will be making her way to the show this season, and fans suspect it’s going to be Barbara Kean (Erin Richards) who will transition into Harley. But whoever the villainess might be, David Mazouz, who plays the young Bruce Wayne in the series, guaranteed that fans will meet her during the finale. “She’s going to be in the finale,” Mazouz told Movie Pilot. “Stay tuned.”

READ: What’s keeping Harley Quinn from appearing on ‘Gotham’?

Earlier, “Gotham” producer Danny Cannon told Comic Book Resources that it has been a great “joy” working with Richards because she is able to deliver a wide range to her character. She was initially the innocent fiancée of Jim Gordon (Ben McKenzie), but it turned out that she had something sinister lurking inside of her.

“The reason we changed her character, [is] because we knew what she could do. We’re like, ‘We can’t keep you in one place. You’ve got to keep evolving.’ So she’s going to evolve again. That’s all I can tell you,” he said.

It is also possible that it won’t be Barbara who will become Harley, but rather the unexpected Dr. Leslie “Lee” Thompkins (Morena Baccarin). She injected herself with the Alice Tetch virus this season in order to confront her demons, and she somehow managed to get her ex-fiancé Jim to take it too.

Executive producer John Stephens even told TV Line that their story will lead to a “rebirth,” since the two characters would embrace “much darker, more dangerous, almost evil versions of themselves” this season.

For now, fans have to patiently wait for the two-hour season finale to air next Monday before finding out just who Harley is. But once the villainess is introduced, “Gotham” can now form the Gotham City Sirens, which consists of Harley, Selina Kyle (Carmen Bicondova) and Poison Ivy (Maggie Geha).

“Gotham” airs every Monday at 8 p.m. EDT on Fox.