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Cast member Bitsie Tulloch poses during a photocall for the TV series "Grimm" at the 52nd Monte Carlo Television Festival in Monaco June 12, 2012. REUTERS/Eric Gaillard

Bitsie Tulloch, who plays Juliette Silverton in NBC’s “Grimm,” teased the show’s fans on Twitter, saying what they saw last week was “so epic,” but the finale is “even more epic.”

“Grimm” Season 4 ends this Friday, May 15, on NBC. In the penultimate episode, which aired a week ago, Nick (David Giuntoli) finds his mother’s severed head in a box. In this same episode, Juliette gets Baby Diana and cements her alliance with the royals.

Adalind (Claire Coffee) does not know that her baby was just in the neighborhood for a moment. Currently pregnant with Nick’s baby, she is in a very vulnerable position. Juliette, who is aware of her condition, is going after her.

Meanwhile, Captain Renard (Sasha Roiz) has been cured. Rosalee (Bree Turner) has concocted a special potion that separates him from Jack the Ripper, who went back to the world of the living with him during his mother’s resurrection ritual.

Trubel (Jacqueline Toboni) has returned to Portland just in time to warn Nick about something that is off about his home. The “Grimm” Season 4 finale synopsis says Juliette will be on Nick’s side when he launches his vendetta.

“On the heels of a shocking discovery, Nick (David Giuntoli) is hell bent on getting revenge and taking the fight to the Royals with help from Trubel (guest star Jacqueline Toboni). Meanwhile, Juliette's (Bitsie Tulloch) alliance continues to lead her down a dark path,” reads the NBC synopsis for “Grimm” Season 4 finale.

The death of Kelly Burkhardt is expected to change the dynamic between Nick and the rest of the characters. Trubel’s return is a welcome news for many fans of the show.

“Cry Havoc” is the title of the “Grimm” Season 4 finale. It was written by Thomas Ian Griffith and directed by Norberto Barba.

NBC has ordered the fifth season of “Grimm.” The horror fantasy series is set to return to continue the story of Nick Nick Burkhardt.

For feedback, you may e-mail the reporter at: a.paredes@ibtimes.com.au.