Friday's all-new episode of "Grimm" will be intense as a man-eating wesen woman wreaks havoc in Portland and Juliette turns to Caption Renard in order find a place to crash and get away from Nick.

Last week's episode left fans wondering what Nick is going to do now that he knows that his girlfriend, Juliette, has transformed into a Hexenbiest. However, according to "Grimm" star Bitsie Tulloch, things will only get darker for her character as Juliette deals with this drastic change and loses her humanity.

Initially, Juliette "just wanted to have her normal life back. But now that she's sort of learning how to control the Hexenbiest within, she's realizing just how powerful this makes her," said Bitsie, according to Dread Central. "And to an extent, as much as she's been able to contribute to the Scooby squad as a veterinarian and then also as somebody sort of good with a gun, this is the first time that she has sort of supernatural powers. So it's really the question going back and forth of do I want to be normal again and be with Nick? Or do I want to stay a Hexenbiest because this is kind of fun?" said the actress, adding: "She's definitely going to the dark side, and that's the intention. And I think that's really where they're going with the character, at least in the immediate future and for the rest of the season."

Tulloch went on to tease that Juliette's transition may become the breaking point in her relationship with Nick.

"The question going forward is can they live like this or not?" said the actress. "And I think she's kind of given up hope because she looks in the mirror, and all she sees is this ugly monster. And she hasn't really embraced it yet. So she's like, 'I can't handle the way that you look at me when I look like this, and this is what I am now.' Because, you know, we've tried... Juliette tried with Henrietta, and there seems to be no cure... it's almost becoming like a Romeo and Juliette situation. Where, yes, they're in love, but they can't really be together the way it is right now."

The actress also dropped spoilers about the season finale, revealing that it will include "the biggest game changer we have ever had" and "really change everything going into Season 5," said Tulloch. "And the Juliette Hexenbiest storyline has a lot to do with that. The reality is that going forward, you're going to see a lot of the push-pull with her psychologically wanting this power. And I think it adds a really interesting element to the story for her to turn really, really dark."

When asked about Juliette's role in the finale, Tulloch answered with: "She is going to cause major, major problems for basically everyone involved. The reality is she misses Nick and she loves him. But she just can't imagine a way for them to be able to stay together under the circumstances. She's been told by numerous people now there's absolutely nothing she can do about it. And so what else would you do? I mean, you have to embrace your new life. She has to go forward with that. And she is dead set on embracing it. She's like, 'If this is how it's going to be, then I might as well be the best Hexenbiest I can.' And there's a darkness to that that's going to seep into her veins. And you're not going to really see the sort of sweet, loving girlfriend that everybody's gotten used to for the last few seasons."

Tulloch also made note of a new Royal that will arrive on the scene.

"There's a new Royal who's coming to town, who's kind of taking charge. So that's a storyline that's coming up."

In addition, fans can look forward to "the whole Adalind being pregnant storyline."

TVLine's Michael Ausiello teased that "Nick and the gang will find out about [Adalind's pregnancy] in Episode 19, which is slated to air in April."

According to Carter Matt, the synopsis for the next episode, entitled "Double Date," reads as follows:

"Nick (David Giuntoli) and Hank (Russell Hornsby) are called to investigate a one night stand turned deadly when a man finds himself in the middle of a very bizarre love triangle. Captain Renard (Sasha Roiz) hopes Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) can help him deal with recurring episodes of phantom bleeding. Meanwhile, Adalind (Claire Coffee) makes a discovery that might turn the tables in her favor and Juliette (Bitsie Tulloch) makes a big decision that could change the course of her relationship with Nick."

"Grimm" Season 4, Episode 15, "Double Date," airs on Friday, March 27, at 8 p.m. EST on NBC.

Watch previews below.