Grimm 4×02 “Octopus Head” – As Nick (David Giuntoli) and Hank (Russell Hornsby) turn their attention to a string of attacks where victims are left without their memories, Nick weighs whether or not he should regain his Grimm abilities. Trubel (guest star Jacqueline Toboni) joins the investigation and puts herself in harms way. In Vienna, Adalind (Claire Coffee) is being held captive and learns that she is more connected than ever to Nick. Meanwhile, Captain Renard (Sasha Roiz) continues to fight for his life as a mysterious visitor (guest star Louise Lombard) arrives to help him. Bitsie Tulloch, Silas Weir Mitchell, Reggie Lee and Bree Turner also star. Phillip Anthony Rodriguez and Brian Letscher also guest star.