NBC gave fans a sneak peek of the fourth season of 'Grimm' through the release of promotional photos for the upcoming installment which is set to air on October 24.

The teaser included a photo showing the lead character Nick Burkhardt's girlfriend, Juliette Silverton, dressed in a lavender cocktail dress, staring at the floor with a startled expression; and another photo showed her talking to a wounded Trubel, the drifter who possesses a Grimm's characteristics.

"Franklin & Bash" actress Toni Trucks will join the 'Grimm' cast and will play Deputy Janelle Farris, a tough sheriff who will ask Nick for help to investigate a doubtful highway crime.

Another character to expect is 'The Mentalist' actor Erick Avari, who will play the role of a salvage-yard owner. The kind of business he has will catch the attention of Nick's investigation as it may be connected to the highway disappearances.

The latest season will also feature four new types of Wesen, creatures whose true appearance are only seen by Grimms, who'll probably arrive to disturb Portland, according to an Entertainment Weekly report.

One of the creatures introduced is a part-man and part-octopus Wesen that sucks memories from its victim's head using its four tentacles. To depict ruthlessness and selfishness, a demon beast Wesen with a long bottom fangs will also be part of the new season.

Meanwhile, Season 4 of 'Grimm' will begin from previous season's cliffhanger, as the lead character, Nick Burkhardt, played by David Giuntoli, continues to keep his secret from Claire Coffee's character Adalind Schade, even after a romantic encounter.

The upcoming season will also tell the viewers if Captain Renard survives after being shot by an FBI agent and if Nick will have his Grimm powers back. Sergeant Drew Wu, played by Reggie Lee, is also someone to watch out for this season, as he found out Nick's secrets in the previous installment.

"Thanks to the Memories," the pilot episode of 'Grimm' Season 4, will air on NBC on October 24 at 9:00 pm.