Grimm Exclusive Video: Whose Return Has Put Monroe in a Killing Rage?

Monroe hasn't had a very good year, and it's about to get worse.

On Friday's Grimm (9/8c, NBC), after some children died in a mysterious fire that may have been set by a Wesen, Nick (David Giuntoli) turns to an old enemy for help in the investigation. He's not the only one unhappy with the decision

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