NBC has released the promo for the eighteen episode of Grimm’s season 4 titled “Iron Hans”, which will air April 24th, 2015.
04/24/2015 (08:00PM – 09:00PM) (Friday) : THE HUNT IS ON AS A WESEN RIGHT OF PASSAGE BECOMES DEADLY – JEFF FAHEY AND NICO EVERS-SWINDELL GUEST STAR – Nick (David Giuntoli) and Hank (Russell Hornsby) are brought in to investigate a homicide they learn is connected to an age-old Wesen rite of passage. Meanwhile, Juliette (Bitsie Tulloch) makes a surprising new ally. Elsewhere, Captain Renard (Sasha Roiz) continues to battle a darkness within, and Nick finds hope for Juliette in the last person he expected – Adalind (Claire Coffee). Silas Weir Mitchell, Reggie Lee, and Bree Turner also star.