After the events at Monroe and Rosalee's wedding, Nick is faced with losing his identity as a Grimm. Hank and Juliette join Nick as they try to figure out how to deal with Trubel as she faces the consequences of a heinous murder she committed. Meanwhile, when Wu 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 life hangs in the balance and Adalind falls into Prince Viktor's trap as she desperately searches for her baby.
Recap / Grimm S 4 E 1 Thanks For The Memories
Knowledge is Power.