"Grimm," NBC's hit supernatural TV drama series is now about to air its fourth season finale but the suspense and action never look to slow down.

This week shows the second to the last episode titled, "Cry Havoc," the manhunt for the vicious serial killer will pursue, the team are aware that it is a Jack the Ripper copycat. At the same time, Juliette (Bitsie Tulloch) journey to revenge will be more destructive, as reported by TV.com.

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Hank (Russell Hornsby) and Nick (David Giuntoli) are getting closer on knowing who the serial killer is. On the other hand, their investigation will lead them to Wu's (Reggie Lee) life at risk.

As for Juliette, she continues with her vengeance on Adalind ( Claire Coffee) and this time, she will do it with someone. The plot for the forthcoming episode featured that the former veterinarian will fake a new alliance. At the same time, Jacqueline Toboni will reprise her role as Trubel this week.

Trubel's return to Portland and her purpose is still unknown. Rumors emerge that she will likely bring some bad news.

Dread Central reported that Nick will have a horrifying discovery in a war path. During the appalling discovery, Nick is hell bent on taking the fight to the Royals and getting revenge with the help of Trubel, although, her alliance with Juliette pursues to bring her down on the dark journey.

Grimm also stars by Bree Turner, Russell Hornsby, Sasha Roiz, Silas Weir Mitchell and Nico Evers-Swindell.

The network reveals a promotional video that announced the upcoming episode will definitely be a thrilling one as it shows that the Jack the Ripper copycat would be a hard case for Hank and Nick to solve. The clip also repeats that the episode will have high-level of helplessness, creepiness and shock until it reaches the end.

The second to the last episode of "Grimm" Season 4, "Cry Havoc," is set to air on May 15 at NBC.

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