By Jessica Michele Herring (staff@latinospost.com) | First Posted: Aug 28, 2013 02:41 PM EDT

(Photo : Scott Green/NBC)

Supernatural drama "Grimm" will feature new monsters and more monster feuds in its upcoming third season. 

Showrunners James Kouf and David Greenwalt told TVLine that upcoming episodes will feature "alligators in the sewer" and  "a reemergence of the Bauerschwein-Blutbad feud." In one episode, Sergeant Wu (Reggie Lee) will collide with the Wesen world, in what is to be one of the most frightening scenes yet. 

The creature he encounters is "something so creepy that the last thing that creepy was the fly episode," Greenwalt revealed. "This is right on par with that." 

TVLine also confirms that Greenwalt has recruited Alexis Denisof to join the show's third season. Greenwalt worked with Denisof on the show "Angel." Denisof will join the fairytale thriller to play Viktor Albert Wilhelm George Beckendorf, Renard's (James Frain) astute first cousin. 

Manny Montana of "Graceland" is also joining the series to guest star as David Florez, a hotheaded ex-marine who served in Afghanistan. Montana's Florez suffers from Post-Traumatic Stress Disorder, an ailment suffered by many vets. 

TVLine also reports that Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) will be getting hitched in season three. Viewer's saw the pair's romance simmer in season two. Yet, it will be difficult for the pair to explain the impending nuptials to their families, seeing as they are two very different creatures. (Monroe is a wolf-like Blutbad and Rosalee is a fox-like Fuchsbau). 

Greenwalt and Kouf said that Nick's (David Giuntoli) zombie-like stay in the box, which was shown in the season two finale, will make him "dangerous." So when Nick wakes up, he will be in a very different frame of mind. 

"He's definitely going to the dark side," Greenwalt said. "And he may get another face of green spit before it's over." 

Grimm's third season premieres on October 25 on NBC.

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