Grimm Season 4 Episode 21 Headache ( Air Date 2015-05-08 ) Genre Drama, Mystery, Sci-Fi & Fantasy category. Overview "While investigating a grisly murder, Nick and Hank get closer to uncovering the identity of the serial killer while Wu's life is put in grave danger. Having turned down Monroe and Rosalee's offer, Juliette solidifies a new alliance as she works to get her revenge. Elsewhere, Trubel makes a surprising return to Portland.".
Grimm Season 4 Episode 21 Headache
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- Watch: Grimm Season 4 Episode 21 Headache on CWR-CRB
- Stars: David Giuntoli, Silas Weir Mitchell, Russell Hornsby, Sasha Roiz, Reggie Lee, Bree Turner, Claire Coffee, Elizabeth Tulloch
- Director: Clinton Wayne, Neal Sopata, David Greenwalt, Richard Marvin, Dan Schaefer
