NBC has released the promo for the twenty episode of Grimm’s season 4 titled “You Don’t Know Jack”, which will air May 1st, 2015.
“YOU DON’T KNOW JACK”
05/01/2015 (08:00PM – 09:00PM) (Friday) : A SERIES OF CONNECTED MURDERS LEAD EVERYONE TO THINK A COPYCAT IS ON THE LOOSE – GARCELLE BEAUVAIS AND NICO EVERS-SWINDELL GUEST STAR – A string of homicides have the press asking Captain Renard (Sasha Roiz) if a Jack the Ripper copycat has arrived in Portland. While dealing with the investigation, Nick (David Giuntoli), Hank (Russell Hornsby), Monroe (Silas Weir Mitchell) and Wu (Reggie Lee) deal with a situation they never expected. Meanwhile, Adalind (Claire Coffee) and Rosalee (Bree Turner) must work together on a last ditch attempt to fix Juliette’s (Bitsie Tulloch) condition. Elsewhere, Juliette decides to help her new ally even if it means hurting those around her.