Grimm Season 4 Episode 20 You Don't Know Jack ( Air Date 2015-05-01 ) Genre Drama, Mystery, Sci-Fi & Fantasy category. Overview "A string of homicides have the press asking Captain Renard if a Jack the Ripper copycat has arrived in Portland. While dealing with the investigation, Nick, Hank, Monroe and Wu deal with a situation they never expected. Meanwhile, Adalind and Rosalee must work together on a last ditch attempt to fix Juliette's condition. Elsewhere, Juliette decides to help her new ally even if it means hurting those around her.".
Grimm Season 4 Episode 20 You Don't Know Jack
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- Watch: Grimm Season 4 Episode 20 You Don't Know Jack 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
