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Nick goes after Kenneth and Juliette, and Trubel, Hank, Monroe, and Wu lend a hand. Meanwhile, Diana meets her grandfather, and Renard looks for someone to blame on the Ripper murders.
While Nick, Hank, and Wu track down the Jack the Ripper killer, Juliette finalizes her relationship with Kenneth and sets a deadly trap for Kelly Burkhardt.
A string of homicides create a fear that a Jack the Ripper copycat has arrived in Portland. As Nick and Hank investigate, they must also respond to an unexpected situation; at the same time, Adalind and Rosalee must work together on a last-ditch attempt to fix Juliette's condition; and Juliette decides to help her new ally, even if it means hurting those around her.moreless
While Nick and Hank investigate a hitchhiker's murder, Juliette is bailed out of jail by an unexpected ally. Meanwhile, Adalind breaks the news of her pregnancy to the father of her unborn child.
A spirit from Indian legend kills two men, and Nick and Hank try to find the common denominator. Meanwhile, Juliette deliberately gets herself arrested, and Rosalee and Monroe set out to find a cure for her with Renard's help.
A woman is found dead, frozen solid, and Nick and Hank soon discover that a Wesen is responsible. Meanwhile, Juliette comes on to Renard, and Monroe suffers PTSD from his time before the Wesenrein tribunal.
While Nick and Hank track down a Wesen with a lethal touch, a new member of the Royals arrives in Seattle to find Diana. Meanwhile, Juliette considers her future in her new state.
While Nick and Hank investigate a murder where a Wesen unleashed a flesh-eating bacteria on her victim, Renard deals with the phantom bleeding and asks Juliette for help. Meanwhile, King Frederick recalls Viktor to Vienna.
Nick and Hank investigate the death of a teenager after someone cut his left foot off. They discover that it's connected to a Wesen ritual that ensures fertility, and Monroe and Rosalee volunteer to go undercover to find the person responsible. Meanwhile, Adalind approaches Renard for help, and Juliette challenges Nick over their relationship now that she has transformed.moreless
Nick and Hank discover that a Wesen that Nick put away has knowledge of an arson they're investigating. Meanwhile, Viktor gets a lead on Kelly and Diana, and Juliette faces off against Adalind.
Nick and Hank investigate two murders and discover that the Wesen Council has sent a bounty hunter to Portland. Meanwhile, Henrietta gives Juliette bad news, and Renard meets with Viktor and Adalind.
While Juliette turns to Renard for help dealing with her condition, Nick and Hank investigate a bizarre death at an alleged haunted house... where a married couple died the same way five years ago.
Nick gathers the whole team, including Wu, to track down Monroe and return him to Rosalee. Meanwhile, Monroe's life hangs in the balance after his abduction by the Wesenrein; and Juliette discovers more about her new reality as a Hexenbiest.
The Wesenrein abduct Monroe and plan to destroy his marriage to Rosalee... permanently. Meanwhile, Nick and Hank show Wu the truth of the Wesen, and Juliette deals with a new face in her mirror.
Nick and Hank investigate a murder involving the legendary Chupacabra and discover that it is connected to the Wesen. Meanwhile, Wu continues to ask questions, Juliette's illness continues, and the Resistance asks Renard what he knows about Diana's disappearance.
Nick and Hank try to deal with the Wesenrein that attacked Monroe and Rosalee, and work on a series of bizarre human invasions involving three goblin-like Wesen. Meanwhile, Trubel talks to Josh and reaches a decision, and Wu comes closer to learning the truth about Nick.
Juliette and Nick agree to perform the ritual that will restore Nick's powers, after hostile Wesen threaten Rosalee and Monroe. Meanwhile, Nick and Hank investigate three mysterious crashes over a six-year period, dating back to one of Nick's first cases. Meanwhile, Josh arrives in Portland, and Adalind and Viktor compare notes about who took Diana.moreless
A South American heiress living in Portland accidentally kills a pedestrian while driving away from what she claims is a talking wolf. Nick and Hank investigate and suspect that a Wesen is involved. A powerless Nick refuses to involve Trubel and asks Monroe to help identify the killer. Meanwhile, Trubel deals with a Wesen who has learned that Nick is no longer a Grimm, and Viktor continues his mind games to break Adalind.moreless
Nick and Hank investigate the case of a victim who was asphyxiated to death... by clay pouring into his lungs. Meanwhile, Wu continues his investigation of Trubel, and Wesen objecting to inter-species marriage target Monroe and Rosalee.
Nick and Hank investigate the death of an ex-boxer and have no choice but to involve Trubel when they suspect Wesen involvement. Meanwhile, Elizabeth goes with Monroe and Rosalee to find Adalind's potion. And in Vienna, a fellow prisoner helps Adalind escape her cell.
Nick and Hank continue pursuing the Wesen who is stealing memories from military contractors, and have no choice but to turn to Trubel for help. Meanwhile, Renard recovers and Viktor imprisons Adalind.
Nick adjusts to the loss of his Grimm powers and tries to figure out how to deal with Trubel as the fourth season opens. Meanwhile, Wu has an unpleasant flashback; a new group of Wesen come to Portland and steal people's memories; Capt. Renard fights for his life; and Adalind's desperation to find her child lands her in Prince Viktor's clutches.moreless