"Grimm" will be filled with more action and horror when it returns from its winter hiatus with all-new episodes later this month.

According to new spoilers released via TVLine, Adalind and Viktor will go on the hunt for little Diana, Ade's Hexenbaby, in the Pacific Northwest. The child, however, has been hidden "somewhere in Central or Eastern Europe," "Grimm" actor David Giuntoli said.

In the meantime, show creators David Greenwalt and James Kouf revealed that viewers should not expect to see Kelly Burkhardt.

Meanwhile, Juliette will face ramifications after transitioning into a Hexenbiest, and Monrosalee will face off with a Wesen hate group while Secundum Naturem Orden Wesen will escalate the tension.

In addition, Garcelle Beauvais will play a recurring role as Renard's Hexenbuddy, a snake monster will terrorize Porland and Wu will come to terms with the reality that Wesen actually do exist.

During an interview with Zap2it, actress Bitsie Tulloch opened up about her character Juliette, how she will cope with being a Hexenbiest and why she chooses to keep her boyfriend Nick in the dark about her dramatic transformation.

"[Becoming a Hexenbiest] is the last thing in the world she wants. It's hard enough for her being as involved as she is with the Grimm stuff," said Tulloch. "She's the kind of Wesen, or witch rather, that her boyfriend's fate is to kill them, so that's kind of scary and she's obviously going to try to hide it from him while she figures out how to correct it. She's obviously going to try to desperately get back to normal."

Although Tullock does not agree with Juliette's decision not to tell Nick, she said that she understands why she chooses to head down that path.

"They're so open and honest now, why not just tell him?" she said. "I think it's honestly just too shocking and too weird for her, and she's scared. She doesn't know. This isn't like anything, and they've dealt with so much, but this is not like anything they've ever gone through. For the time being, I think she's not going to turn to her closest friends or Nick for help with this one. She's too scared of how they will react."

Tullock also teased that there will be an "epic" showdown between Juliette and Adalind, who is the reason why she turned into a Hexenbiest.

"There is a cat fight that is going to happen this season, and it is going to be epic. If not the biggest fight so far on any 'Grimm' episode, it's up there. [Juliette] just wants to kill [Adalind] at this point. Literally she wants to kill her. It's just so much," Tulloch said. "I think that [Adalind is] a great villain, but since Season 1 the fans have been desperately wanting Juliette to finally fight her head-to-head."

Season 4, Episode 9 of "Grimm," "Wesenrein," premieres on NBC on Friday, Jan. 16, 2015, at 9 p.m. ET.

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