NBC has released the promo for the twenty one episode of Grimm’s season 4 titled “Headache”, which will air May 8th, 2015.
05/08/2015 (08:00PM – 09:00PM) (Friday) : THE MANHUNT CONTINUES FOR A VICIOUS SERIAL KILLER – JACQUELINE TOBONI RETURNS AS ‘TRUBEL’ – While investigating a grisly murder, Nick (David Giuntoli) and Hank (Russell Hornsby) get closer to uncovering the identity of the serial killer while Wu’s (Reggie Lee) life is put in grave danger. Having turned down Monroe (Silas Weir Mitchell) and Rosalee’s (Bree Turner) offer, Juliette (Bitsie Tulloch) solidifies a new alliance as she works to get her revenge. Elsewhere, Trubel (guest star Jacqueline Toboni) makes a surprising return to Portland. Sasha Roiz and Claire Coffee also star. Nico Evers-Swinderll guest stars.