Dailies | ‘Grimm’ Sneak Peek: The Gang Faces a Subterranean Boogeyman (Exclusive Video)

The NBC series breathes new life into an urban myth on Friday's new episode

As long as cities existed, there have been urban legends about dangerous people or things living in the sewers below. “Grimm” tackles the myth on Friday's new episode.

On the episode titled “Cold Blooded,” a deadly crime spree leads Nick (David Giuntoli) down into Portland's sewers where he discovers (spoiler alert!) to discover a species of sewer alligator wesen.

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Meanwhile, Adalind (Claire Coffee) meets Prince Viktor — played by guest star Alexis Denisof — in Europe. Viktor wants revenge for his cousin Eric's demise to justice. And, Captain Renard (Sasha Roiz) plots his response to the recent attempt on his life.

“Grimm” has grown to become the No. 1 series on Friday nights. More than 9 million people tuned into last week's episode.

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NBC airs two back-to-back episodes this Friday starting at 9/8c.

Watch TheWrap's exclusive preview from the episode above.