Monroe and Rosalee make the final preparations for their wedding day, but Adalind is hatching a scheme of her own.
Nick receives a treasure trove of books and items from another Grimm, who is being hunted by the Verrat.
Nick enlists Monroe and Rosalee to train Trubel on the world of Wesen, but the young Grimm can't stay away from the action.
Nick's world is rocked when a mysterious drifter named Trubel arrives in Portland.
The gang circles the wagons to defend Adalind's baby against an attempted kidnapping from The Royals.
Nick investigates a mysterious murder at a Wesen carnival.
Nick (David Giuntoli) and Hank (Russell Hornsby) find themselves thrown into the middle of an ancient battle and things heat up when the Wesen Council decides to get involved. Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) fill everyone in on early Wesen history. Meanwhile, Sgt. Wu (Reggie Lee) is still reeling from the events he recently experienced. As things heat up in Europe, one of the Resistance’s most trusted allies gets compromised as he tries to protect Adalind (Claire Coffee).
A gruesome baby-eating Wesen torments members of Portland's Filipino community, and Sargent Wu has an encounter that he can't explain.
Nick and Hank continue the hunt for the Wildesheer, a vicious Wesen serial killer who only targets worthy adversaries.
Nick (David Giuntoli) and Hank (Russell Hornsby) investigate a cop killer who scalps his victims. Meanwhile, Juliette (Bitsie Tulloch) begins to communicate with Nick’s mom via email and Adalind (Claire Coffee) finds herself much closer to delivering her baby than she previously thought. Elsewhere, Monroe's (Silas Weir Mitchell) parents (guest stars Dee Wallace and Chris Mulkey) decide to surprise him and Rosalee (Bree Turner) with an early arrival to Portland after learning some exciting news.
Nick and Hank investigate the vigilante murders of the members of a platoon of war veterans who were accused of atrocious crimes while serving overseas.
Nick (David Giuntoli) and Hank (Russell Hornsby) are called to the scene of a gang-related homicide. The case escalates as Zuri (guest star Sharon Leal), Hank’s physical therapist, and her brother get caught up in the investigation. Meanwhile, Juliette (Bitsie Tulloch) seeks advice from Rosalee (Bree Turner) in dealing with the news that her friend is Wesen.
Nick (David Giuntoli) and Hank (Russell Hornsby) investigate a Wesen "healer" whose ability holds risks that far outweigh its rewards. Meanwhile, Juliette (Bitsie Tulloch) takes in a friend when domestic issues escalate and Hank makes a move on his physical therapist Zuri (guest star Sharon Leal). Elsewhere, Captain Renard (Sasha Roiz) finally tracks down Adalind (Claire Coffee) and has a stern warning for her.
Nick and Hank battle the Krampus, a legendary anti-holiday Wesen who preys on the naughty youth of Portland.
As a deadly crime spree begins to surface, a century-old urban legend takes shape in Portland's sewers and becomes Nick's (David Giuntoli) latest case. In Europe, Adalind (Claire Coffee) meets Prince Viktor (guest star Alexis Denisof), who's come to bring those responsible for his cousin Eric's demise to justice. Meanwhile, Captain Renard (Sasha Roiz) responds to the recent attempt on his life.
Nick suspects a Wesen link when a priest is brutally murdered during an exorcism.
Silas talks about Santa's evil twin.
A deadly crime wave may be linked to a 100-year-old urban legend. Meanwhile, Adalind meets up with Eric's cousin, Prince Viktor (Alexis Denisof), who's seeking justice for his deceased kin and Capt. Renard responds to the attempt on his life.
NIck and Hank arrive on the crime scene and find out that Sgt. Wu knew the victim. They also discover and follow a trail of blood.
Juliette visits Wu and shares a personal experience of hers to help with his recovery.
After the discovery of a rare Egyptian mummy, two Wesen thieves attempt to steal the ancient relic.
Nick and Hank investigate a double homicide that's linked to the Verrat. Meanwhile, Trubel meets a father-and-son team who traveled a great distance to find "the Portland Grimm" and Renard grows suspicious of Adalind's behavior.
A "Hollentier" is described.
Researching the history of their newest assignment in the book.
Monroe and Rosalee go undercover at a traveling carnival that's linked to a double homicide. Meanwhile, Monroe asks Nick an important question pertaining to his upcoming nuptials and a member of the Resistance goes all in to help Adalind.
A monstrous predator goes after a couple who are friends with Wu, and Nick and Hank must figure out how to deal with a delicate situation after Wu witnesses something unexplainable. Meanwhile, Adalind is pursued by enemies as she prepares to give birth.
Monroe and Rosalee look through pictures of the Anubis mummy and break down the history to Nick and Hank..
Nick and Hank pay a visit to a bizarre Wesen carnival that may be linked to a double homicide investigation.
Grimm's Bitsue Tulloch discusses the epic season 3 finale and the perpetual bane of Juliette's existence, Adalind Schade.
Nick and Frank visit Bree and Monroe to see if they've ever heard of Wesen Gangs.
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