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.
While Sergeant Wu recovers from his Aswang encounter, Nick and Hank investigate the attempted theft of an Ancient Egyptian Wesen mummy at the local university.
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 delves in the world of Russian healers, while Juliette helps an abused friend.
After a string of delinquent teens go missing, an old Wesen tale of an evil Santa who brings more than just a lump of coal may be the prime suspect. The investigation intensifies as Nick (David Giuntoli) and Hank (Russell Hornsby) take things a little too far. Meanwhile, Monroe (Silas Weir Mitchell) enlists Juliet (Bitsie Tulloch) to surprise Rosalee (Bree Turner) for their first Christmas together with unintended results. Elsewhere, Captain Renard’s (Sasha Roiz) tour of Europe brings him closer to tracking down Adalind (Claire Coffee).
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.
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