Tonight's Season 4 premiere of 'Grimm' promises more tension between the sexes (and species) and even scarier creatures as Detective Nick Burkhardt struggles to let go of his ancestral Grimm powers.

Will Nick get back his powers? Is Trubel in trouble? Will the Captain survive? Fans of NBC's Grimm have much to look forward to, as the fourth season of the popular supernatural drama series gets even darker starting tonight!

“You thought you liked season one through three? Wait til you see season four!” quipped David Giuntoli (Detective Nick Burkhardt). While season three had many cliffhangers during its exciting finale, Friday’s premiere picks up right after that, with lots more scary creatures.

Grimm Nick Burkhardt Season 4 Photo

David Giuntoli as Nick Burkhardt. (Photo by: Scott Green/NBC)

With Adalind managing to morph into Juliette for a sexy interlude, Nick’s relationship with Juliette may be in trouble. “I was roofied by the witchery of Adalind and she made love to me,” explained Giuntoli. “Nick and Juliette will need to repair things, which will be difficult to come back from. But hey, I have faith in Juliette and me!”

But this season, it might be a long way back for them two of them to find romance. “I think it will be really hard for Juliette to forgive Nick, because even though he didn’t know what he was doing, just the mental image of Adalind, who Juliette pretty much hates her guts — for good reason — will make it a difficult thing to get over,” noted Bitsie Tulloch (Juliette Silverton). "But the reality is, the two of them have been longing for a normal life, and now there is a possibility that they could have one."

Nick is also now dealing with a world with no powers, and we will see him deal with that in future episodes. “My relationship to being a ‘Grimm’ has gone from ‘get this away from me’ to reluctant acceptance to kinda owning it and now his powers are gone!," Giuntoli said. "It’s the thing that he never wanted and now he wants it back in some ways. He has a complex relationship with his identity, and ultimately, it’s probably for the better for the world if he gets his powers back — but perhaps not his personal life. Who knows?”

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Russell Hornsby as Hank Griffin. (Photo by: Scott Green/NBC)

But it seems like a powerless Nick is also good for Detective Hank Griffin (Russell Hornsby). “Now, he and Nick are true partners, who have common ground,” said Hornsby. “They both lost their crutch. Hank got a little reliant on Nick’s ability to see and I think they now have to go back to being true detectives. So the two of them will have to depend on each other a lot more than they have in the past. They are having to go back to basics, and will find a new playing field for themselves.”

Playing off that new dynamic is Trubel (Jacqueline Toboni). “Nick has to begrudgingly count on Trubel, who is now the new Grimm in the fold,” added Hornsby. “We both rely on her, at the same time trying to teach her what it is to be a Grimm with all the responsibility that she has to undertake.”

According to Toboni, Trubel is quite focused on getting Nick his powers back if he wants them. “But before that happens, I am his eyes and ears out there," she says, "I get to play cop for them, but I don’t follow the rules very well! So we’ll see how the law treats me!”

Grimm Season 4 Photo

David Giuntoli as Nick Burkhardt, Jacqueline Toboni as Trubel. (Photo by: Scott Green/NBC)

Monroe (Silas Weir Mitchell) and Rosalie (Bree Turner) barely got married before a Grimm had to destroy their nuptials, which will have an effect on their relationship. “That wedding interruption was Rosalie’s absolute worst nightmare!” acknowledged Mitchell. “But Trubel’s a good kid, she meant well, she was trying to help Nick. And there’s no honeymoon either, since we have to be there for Nick, who is in trouble. Rosalie and I are very invested in Nick getting his ‘Grimm’ back. Without that, we could be out on a limb, with him and each other. It’s been too easy for Monroe and Rosalie thus far, but now trouble is a brewin!”

Expect the community to reject Monroe and Rosalie’s union. “It’s a big deal that these two species have come together and it’s not done,” said Turner. “There are some extremist groups that want to see us apart and are violent. A lot of scary things are going to come between the couple.”

The fourth season of 'Grimm' premieres tonight at 9/8c on NBC.