Nico Evers-Swindell

John receives an invitation to attend an exclusive Devil's Night Soiree. Alex tries to diagnose Holden's strange condition.

On the heels of a shocking discovery, Nick (David Giuntoli) is hell bent on getting revenge and taking the fight to the Royals with help from Trubel (guest star Jacqueline Toboni). Meanwhile, Juliette's (Bitsie Tulloch) alliance continues to lead her down a dark path.

Nick (David Giuntoli) and Hank (Russell Hornsby) are called to investigate a rare Wesen that leaves its victims frozen solid. Meanwhile, Juliette (Bitsie Tulloch) starts to feel that she is losing her humanity as she seeks to get revenge on Adalind (Claire Coffee). Elsewhere, Captain Renard (Sasha Roiz) continues to suffer from mysterious bleeding and visions while Monroe (Silas Weir Mitchell) works toward coming to grips with the Wesenrein incident.

Nick (David Giuntoli) and Hank (Russell Hornsby) are brought in to investigate a homicide they learn is connected to an age-old Wesen rite of passage. Meanwhile, Juliette (Bitsie Tulloch) makes a surprising new ally. Elsewhere, Captain Renard (Sasha Roiz) continues to battle a darkness within, and Nick finds hope for Juliette in the last person he expected.

A string of homicides have the press asking Captain Renard (Sasha Roiz) if a Jack the Ripper copycat has arrived in Portland. While dealing with the investigation, Nick (David Giuntoli), Hank (Russell Hornsby), Monroe (Silas Weir Mitchell) and Wu (Reggie Lee) deal with a situation they never expected. Meanwhile, Adalind (Claire Coffee) and Rosalee (Bree Turner) must work together on a last ditch attempt to fix Juliette's (Bitsie Tulloch) condition. Elsewhere, Juliette decides to help her new ally even if it means hurting those around her.