S4, E1: After the events at Monroe (Silas Weir Mitchell) and Rosalee’s (Bree Turner) wedding, Nick (David Giuntoli) is faced with losing his identity as a Grimm. Hank (Russell Hornsby) and Juliette (Bitsie Tulloch) join Nick as they try to figure out how to deal with Trubel (guest star Jacqueline Toboni) as she faces the consequences of a heinous murder she committed. Meanwhile, when Wu (Reggie Lee) arrives at the scene, his discoveries bring back images of his traumatic encounter. A new threat arrives in Portland to steal the memories of its victims, leaving them in a state of dementia. Elsewhere, Captain Renard’s (Sasha Roiz) life hangs in the balance and Adalind (Claire Coffee) falls into Prince Viktor’s (guest star Alexis Denisof) trap as she desperately searches for her baby.