On the next two episodes of Grimm, Juliette (Bitsie Tulloch) will step into the foreground and try to protect one of her best friends.

Tulloch spoke with Zap2it recently about the upcoming story arc, which involves Juliette trying to save her friend, who turns out to be a Wesen.

"One of [Juliette's] best friends is in a tremendous amount of peril, and Juliette kind of ends up inadvertently being the only one that can save her," Tulloch said. "That's definitely the biggest action sequence I've done so far. It was almost eight-and-a-half, nine hours straight of doing stunts. My back hurt for two weeks."

Tulloch suggested that Juliette will get into a fight with her friend that may escalate to physical violence.

"Nick's [David Giuntoli] kind of training her so that she can defend herself," Tulloch said. "One of the things that's been fun for them to play with in Season 3 with my character is sort of a small version of what Nick went through Season 1 as far as kind of being thrown into the fire. Not having any frame of reference. It was almost worst for Juliette in a way. As soon as she really finds out and believes it, there's a zombie invasion."

Tulloch also said that she enjoys the increased role she's had for season 3, with Juliette getting to a point at which she can help Nick and Monroe (Silas Weir Mitchell) in their conflicts.

Grimm season 3 returns for its midseason premiere Friday at 9 p.m. on NBC.

Watch a trailer for the midseason premiere of Grimm here:

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Grimm NBC, Grimm, Spoilers