Portland detective Nick Burkhardt, descended from a long line of warriors known as Grimms, defends his city from magical creatures known as Wesen, which are part human and part animal. Fighting alongside his partner, Hank, colleague Sergeant Wu and friends Monroe and Rosalee, Nick faces off against internal and external forces, including his police captain, Sean Renard.
Still reeling from the events of the third season finale, the team drop everything to find a way to get Nick his powers back. (S4, ep 1)
While the Gedächtnis Esser remains at large, Renard's mother arrives at the hospital in an attempt to save his life. (S4, ep 2)
The Last Fight: Monroe and Rosalee get some much needed help as they try to restore Nick's powers, while he and Hank look into goings-on at a Wesen boxing gym. (S4, ep 3)
Soon after a rabbi summons then loses control of a Golem, Nick and Hank are called to investigate the suspicious death of a familiar Wesen. (S4, ep 4)
While Juliette and Nick consider if being a Grimm is worth the cost, he and Hank investigate a woman driven to madness by a talking wolf. (S4, ep 5)
Monroe and Rosalee deal with purist Wesen, as Nick and Juliette weigh up whether a normal life is for them. (S4, ep 6)
Trubel and Josh work to track down the Wesen threatening Rosalee and Munroe, who has a Christmas surprise for his new wife. (S4, ep 7)
Nick and Hank investigate a series of horrific murders linked to the legendary Chupacabra. (S4, ep 8)
Nick and Hank finally bring Wu into the fold as they race to save Monroe from the Wesenrein. (S4, ep 9)
Time is running out for Monroe as Nick pulls out all the stops to find his friend. Juliette is forced to accept her new reality. (S4, ep 10)
Death Us Do Part: After a paranormal investigator is electrocuted in a supposedly haunted house, Nick, Hank and Wu search for Wesen involvement. (S4, ep 11)
Maréchaussée: Nick heads for a conflict with the Wesen Council when he refuses to overlook the actions of their assassin. (S4, ep 12)
Hank and Nick investigate when two teenagers are killed in an arson attack, soon realising they must turn to a former foe for help. (S4, ep 13)
While investigating a murder victim missing a foot, Nick, Hank and Wu learn of the Wesen interpretation of the lucky rabbit's foot. (S4, ep 14)
Nick and Hank investigate a deadly one-night stand and send Munroe undercover to find the Wesen culprit. (S4, ep 15)
Nick hunts a Wesen who kills with a single touch, just as a new royal makes their way to Portland. (S4, ep 16)
While Juliette plots her revenge against Adalind, Nick and Hank search for a murderous Wesen with the ability to freeze its victims. (S4, ep 17)
A homicide case leads to Nick and Hank investigating the Native American legend of the Mishipeshu, an underwater panther. (S4, ep 18)
Nick and Hank discover their latest investigation is related to a deadly, age-old Wesen rite of passage. (S4, ep 19)
As Adalind and Rosalee work to help Juliette, Nick investigates a killer labelled by the press as a Jack the Ripper copycat. (S4, ep 20)
Nick and Hank close in on their target, but Wu's life is in grave danger. Meanwhile, Juliette makes a decision she can't go back on. (S4, ep 21)
As Juliette's decisions lead her to a dark place, a stunned Nick resolves to stop at nothing in his quest for revenge. Season finale. (S4, ep 22)