An exciting and intense promo video of the midseason premiere of "Grimm" coming next month reveals that Juliette (Bitsie Tulloch) will be involved in a Wesen plot to take over the world.

Despite Juliette's tragic death at the end of Season 4, actress Tulloch made an unexpected return to the show during the winter finale. In that episode, "Wesen Nacht," Juliette appeared out of the blue, while Nick (David Giuntoli) and his crew were fighting off an ambush by the Wesen uprising, also known as Black Claw.

A preview video for the upcoming episode, titled "Eve of Destruction," shows the Black Claw leader announcing a plan to become the new rulers of the world. In another clip, Juliette seems to warn Nick about "a world run by Wesen."

According to The Hollywood Hills, the teaser plot summary states, "A global plan to end humanity and only the Grimm have the keys to survival."

During an interview with TVLine, "Grimm" co-creator David Greenwalt opened up about Tulloch's character, revealing that she will not necessarily reprise her role as Juliette in the second half of Season 5. Instead, she will play a woman named Eve, who shares many of Juliette's memories, has ties to the Black Claw, and is extremely dangerous.

"It's not really Juliette anymore. It's this new character, Eve, who has not been brainwashed exactly, but she's been through some incredibly tough training where they broke her down to nothing," Greenwalt said. "She's basically a super Hexenbiest weapon for Hadrian's Wall to fight Black Claw."

Tulloch also opened up about her new role, telling TVLine that "Juliette's flesh and blood, her DNA, is still alive. But this is not Juliette."

The actress added that Eve has a strong handle on the Hexenbiest skills that Juliette had trouble managing.

"The new character is all about reining it in in and utilizing this in the best possible way, not wasting an ounce of this incredible power that she has," Tulloch said.

"Grimm" Season 5 Episode 7 will premiere on Friday, Jan. 29 at 9 p.m. ET on NBC.

Watch a preview below.