Nick Burkhardt thought he prepared himself for the realities of working as a homicide detective until he started seeing things he couldn't explain. Nick's life turns upside down when his Aunt Marie reveals they are descendants of an elite group of hunters, known as "Grimms," who fight to keep humanity safe from supernatural creatures. As Nick digs deeper into her past, he realizes that he will have to shoulder the responsibility of his ancestors.
After their face-off with Kimura, Nick finds himself trying to come to grips with the return of his mother, Kelly Burkhardt. A trail of brutal murders unveils a foreign conspiracy to hunt down Nick, leading to several revelations about his past. Meanwhile, Juliette still lies in her mysteriously-induced coma as Rosalee and Monroe work tirelessly to bring her out of it safely. Elsewhere, Hank struggles with the shocking truths he’s recently seen and Captain Renard deals with unexpected family issues when his estranged brother comes back into his life.
As Nick and his mother continue to battle the Mauvais Dentes, Monroe and Rosalee fight against the clock to save Juliette. More details are revealed about the source of Juliette’s illness, resulting in an epic showdown. Back at the precinct, Hank senses that something is amiss when Nick lands in hot water with the FBI. Meanwhile, Captain Renard continues to reveal himself as he deals with his estranged brother.
As Hank continues to seek help to cope with the inexplicable sighting he had, an old friend, Jarold Kempfer, needs his help when his daughter goes missing. Nick’s expertise as a Grimm comes into play as he investigates the disturbing motives linked to the disappearance.
While investigating an accident site, Nick comes upon a bizarre and gruesome Wesen disease that is spreading quickly. A romantic day out for Monroe and Rosalee takes a dangerous turn when they encounter an infected creature that is out for blood. Meanwhile, Captain Renard gets a tip about a dangerous foreign fugitive who’s made his way to Portland
When a local Reverend reports that his church has been robbed, Nick quickly learns that it's a Wesen church, and enlists Monroe to check for any suspicious activity regarding the shepherd's flock. Meanwhile, Nick and Juliette continue to figure out the rules of their relationship as a dangerous opponent lurks in the shadows with his sights on Nick.
Angelina comes back in to town with bad tidings as Monroe learns his continued cooperation with the Grimm may come at a high cost. Nick comes to Hank for help to keep Monroe safe and Hank uses this time to get caught up with his knowledge of the “Wesen world.” Meanwhile, an old European acquaintance pays Captain Renard a visit, but it’s hard to tell if this visit is for business or pleasure.
After investigating a grisly murder, clues lead Nick and Hank to a seemingly unstable father who is on the run with his daughter. As they learn more about the case they realize that the girl’s father may be the least of their worries. At the spice shop, Monroe finds out filling in for Rosalee isn’t as simple as he’d hoped it would be. Meanwhile, Captain Renard finds himself paying unwarranted attention to more than one woman from his past.
Nick and Hank are called to the scene of a murdered high school academic decathlete and learn just how competitive some extracurricular activities can be, and the extremes some coaches and parents will go to give students the best chance for success. In other police matters, Captain Renard deals with an unwanted infatuation while we learn an old accomplice of his has been spending time with his family in Europe.
Despite the enthusiastic anticipation of the city’s residents for Halloween, a series of horrifying child abductions make their way to Portland, quickly spoiling the holiday spirit. Nick and Hank join forces with Valentina Espinosa, a mysterious detective from Albuquerque, to help find and capture the elusive suspect. Meanwhile, Monroe celebrates the holiday in fine style as he teaches the neighborhood bullies a lesson.
When a brutal vigilante homicide is made public, it sends Portland’s Wesen community into a frenzy. As Nick investigates further, he discovers a pattern similar to that of a particularly brutal line of past Grimms. Is there another Grimm in town, or is Nick dealing with a sadistic copycat? Meanwhile, Captain Renard takes it upon himself to offer Juliette comfort in handling her ongoing dilemma with Nick.
Hank starts reflecting on an arrest he made earlier in his career regarding a man who committed murder claiming “self-defense against monsters.” With the man’s death sentence rapidly approaching and the knowledge he’s recently gathered from Nick, Hank begins to wonder if there was more truth to the man’s seemingly absurd story then he once thought. Back at the spice shop, Monroe finds himself involved in a situation he never saw coming.
Adalind returns to wreak havoc in everyone’s lives and avenge her mother’s brutal death. She has her eyes set on Nick and those closest to him – especially Hank and Juliette. Elsewhere, Captain Renard’s obsession continues to escalate. Meanwhile, a surprise visit at the spice shop gives Monroe more than he ever bargained for.
After Nick learns about Juliette and Captain Renard, he must deal with the consequences. Things get even more complicated when Nick is called to investigate his own crime. Meanwhile, the search for the key intensifies as Captain Renard finds Nick’s trailer and makes a surprising alliance. With Rosalee’s help, Monroe informs Nick that they might be able to stop what’s going on with Renard and Juliette before it goes too far. Elsewhere, Wu responds to a bizarre shooting at Nick and Juliette’s house.
The Wesen code of honor comes into question when Nick, Hank and Monroe discover a series of bank robberies with Wesen using true natures as their disguises. Meanwhile, Juliette finds herself tormented by faint, slowly returning memories that cause her to question her mental state.
While trying to work out the ramifications of his new alliance with Renard, Nick investigates a murder where the victim was blinded with parasites sprayed into her eyes. Meanwhile, Juliette's hallucinations become clearer, and Adalind asks for help with her pregnancy.
When a gruesome homicide brings an office party to a screeching halt, Nick and Hank find themselves battling a Wesen on a completely new platform - online. Meanwhile, Juliette's mysterious hallucinations finally start to take shape, giving them a whole new meaning.
While on jury duty, Rosalee tasks Nick, Hank and Monroe to help stop a defense attorney from using his particular “Wesen wiles” to overturn what should be an open-and-shut murder case. Back at the precinct, Captain Renard brings Nick and Hank in on his own recent dealings with the Verrat, to keep them on their toes. Meanwhile, a return to the trailer brings a flurry of memories of Nick rushing back to Juliette.
Nick finds himself fighting a wildly different sort of nature freak in a desperate attempt to keep a volcano from burying Portland in lava. Meanwhile a pregnant Adalind meets a powerful new ally in Europe. Meanwhile, Juliette seeks out help after becoming overwhelmed by the latest side effect of her recovery – multiple memories of Nick showing up everywhere.
Mysterious cow mutilations and reports of glowing creatures put Nick on a case that forces him to question the existence of aliens within the Wesen world. He also meets a strange UFO expert who seems to know more than he’s letting on. Meanwhile, Nick digs further into the key, and Juliette’s romantic memories of Nick start coming back in a big way.
Nick discovers a muse-like Wesen with the ability to influence those she gets close to – some with positive results, others with terrifying ones. Nick must find a way to get close without losing himself in the process. Juliette arranges a dinner date with Nick in the hopes of clearing the air, but their plans go awry as the case intensifies. Meanwhile, Rosalee takes her first visit to Aunt Marie’s trailer.
Nick and Hank discover a new kind of strange when they investigate suspects being found dead - for the second time. In Europe, Adalind finds herself in the middle of a feud between Frau Pech and Stefania while working over the details of her pending transaction. Meanwhile, determined to remember every last detail to get things started once more, Juliette insists Monroe share with her Nick’s darkest secret - the world of Grimms and Wesen.
Just when things look like they’re back to normal with Juliette, Nick is called to investigate a flurry of rage-fueled assaults happening all over Portland. He goes to Monroe and Rosalee for help battling Portland’s newest wave of "undead." As if that weren’t enough, Captain Renard informs Nick that his brother Eric is in town on family business. Meanwhile, Stefania and Frau Pech methodically use their alliances with Adalind to battle one another.
After the mysterious brutal attack of a local college co-ed, Portland homicide Detective Nick Burkhardt discovers he is descended from an elite line of criminal profilers known as "Grimms", charged with keeping balance between humanity and the mythological creatures of the world. As he tries to hide the dangers of his new found calling from his fiancée, Juliette Silverton, and his partner, Hank Griffin, he becomes ever more entrenched in the ancient rivalries and alliances of the Grimm world. With help from his reluctant confidant, Monroe, a reformed Grimm creature himself, Nick must navigate through the forces of a larger-than-life mythology.
After a case of breaking and entering has one of the intruders go missing, Nick and Hank talk to a mysterious family whose cultural background blurs the line of right and wrong. Meanwhile, Nick tasks Monroe with the safeguarding Aunt Marie, who was almost killed the night prior by a hexenbiest.
The station is abuzz as Nick and Hank are called to a case where an innocent flash mob results in a gruesome homicide. As Nick delves further into the investigation, he learns more about his unique family history, and finds himself at odds when he and Hank are assigned to protect a dark character from his recent past.
After investigating a strange cluster of female deaths and disappearances, Nick sends Monroe undercover to get a whiff of a hypnotic suspect. In the meantime, a stranger shows up looking to avenge the death of his friend at the hands of a Grimm, but he'll have to get past Captain Renard.
Nick and Hank's investigation of a dead high school teacher leads them to the school's outcast, Roddy. Nick realizes that there's more to Roddy than meets the eye, and enlists Monroe's help to get through to the troubled teenager before he exacts revenge on the students who wronged him. Meanwhile, Nick learns that his presence is beginning to affect the creature world.
Nick is called to a suspected arson case, which exposes a longstanding family feud that brings Monroe face-to-face with characters from his troubled past. While Monroe wrestles with restraining his wild side, it's up to Nick to keep everything from going up in flames.
A mysterious homicide deep in the woods leads to Nick and Hank reopening a long-cold missing persons case. When Nick suspects this abducted person might be a feral creature, he asks Monroe to help remind this wild child of her human nature.
An escapee returns to Portland seeking revenge against those who put him behind bars, including Hank, the arresting officer. His unusual strength and high tolerance for pain makes Nick suspicious that he might be more than human. As the case escalates Nick and Juliette are put in danger, and Monroe is called into action to help put an end to the convict's deadly rampage.
While investigating a gruesome homicide, Nick learns that a seemingly mild-mannered resident could be festering a potential monster created from a dark childhood. Meanwhile, Monroe is sent an unsettling message by the creature community, who are beginning to wonder if his priorities lie with them or a Grimm.
As Portland’s homeless youth start to go missing, Nick uncovers a deadly black market supplying the Grimm world with human organs for all types of elixirs. As the investigation heightens, Nick and Juliette befriend a pair of homeless siblings, Hanson and Gracie, whose friends have gone missing.
Nick and Hank find themselves on the hunt for a deadly heartbreaker leaving behind a web of dead bodies. Meanwhile, Nick’s growing recognition among the creature world is starting to threaten not only his safety but Juliette’s as well, and it may be time for him to take action to keep her safe.
A bizarre double homicide leads Nick and Hank to a boxing gym, which Nick discovers is a supplier for a darker, ritualistic fight club in the creature world. When Monroe lends a hand and gets in over his head, Nick must dig deep and find his inner “Grimm” to defend him.
A failed jewelry store robbery results in a murder that finds Nick and Hank immersed in a hunt for rare coins. Nick soon learns that these coins have an unsettling effect on whoever possesses them, as Hank and Captain Renard begin to exhibit unusual behavior. Meanwhile, a mysterious old friend of Aunt Marie’s comes to Nick with information about his family and what led to his parent’s death.
While investigating an arson-related homicide with Hank, Nick finds himself in the heated world of Portland fire-dancing where he meets a woman who might just be too hot to handle. With Monroe’s help, Nick will have to find out if he can investigate the case without getting himself or those close to him burned.
After the grisly murder of a familiar shop owner, Nick joins forces with Monroe to help solve the murder. When the shop owner’s sister, Rosalee, comes to town, Nick thinks he may have found a new ally in the creature world. Elsewhere, Captain Renard enlists Adalind to cast a spell on Hank. Meanwhile, Sgt. Wu unwittingly becomes entangled in Adalind’s dastardly plan.
Nick pulls out all the stops to plan a romantic getaway for Juliette in an attempt to get their relationship back on track. Nick’s duties as a Grimm get in the way of romance when he meets the unsettling neighbors and discovers that the troubled wife has a rare and valuable treasure to protect. It’s left to Nick to keep everyone safe. Back in Portland, Hank and Monroe each find themselves on the brink of new romantic relationships.
Nick and Juliette join Hank for dinner, where Nick discovers Hank’s mystery date is none other than Adalind, the same Hexenbiest who tried to kill Aunt Marie. Meanwhile, Captain Renard takes matters into his own hands when a visit from foreign representatives of his royal bloodline threatens his position. Elsewhere, Monroe and Rosalee are called into action when the lives of Hank and Sgt. Wu hang in the balance.
While investigating a string of murders, Nick and Hank learn that their suspect’s crime wave began overseas. When Nick discovers the suspect is being harbored by none other than Monroe and Rosalee, he realizes he’s hunting the hunted, a freedom fighter trying desperately to escape the clutches of a creature bounty hunter.
As Nick delves into the trailer’s weapons cabinet and his inner Grimm, the investigation of a dead construction worker leads him into a long standing conflict in the creature world. Sensing an unfamiliar threat, the suspect takes it upon himself to summon reapers to town to eliminate the Grimm once and for all. Meanwhile, Juliette insists that Nick invite Monroe over for dinner, making for quite the interesting evening.
Nick and Hank are called to investigate the mysterious death of a wealthy matriarch, after her stepdaughter loses everything in a Ponzi scheme. Meanwhile, Juliette does some digging into the mysterious death of Nick’s parents in an effort to help him find closure.
After Juliette stumbles upon a brutal murder, Nick learns the suspected creature, and friend of Monroe, is suffering from a mysterious condition — the inability to completely return to human form. This mysterious condition leads them to a therapist who’s created an artificial drug to suppress the creature side, with horrifying side effects. Meanwhile, the investigation takes a surprising turn when Hank sees something he can’t quite explain.
As Nick delves deeper into his life as a Grimm, a trail of grotesque murders reignites the search for the elusive gold coins. The arrival of a mysterious woman in black begins to get in the way of Nick and Hank’s investigation as extra precautions have to be taken to ensure their safety. Meanwhile, Nick’s ability to keep his true nature secret from Juliette comes to a tipping point.
A panicked Juliette, Monroe, and Rosalee enlist Hank's help in fending off a zombie hoard while trying to figure out what happened to Nick. Knowing the truth, Captain Renard takes measures to help rescue Nick from the clutches of his brother, Eric. Elsewhere, along with the help of the mysterious Stefania, Adalind finds herself facing her most gruesome task yet in her effort to regain her Hexenbiest abilities.
Monroe, Hank, Rosalee and Juliette track down a manic Nick and do all they can to find him and reverse what's been done to him before he causes any more damage. Meanwhile, Captain Renard does his best to clean up the zombie fallout on all fronts - domestic and international. Elsewhere, the more time Adalind spends with Stefania, the more disturbing things seem to get in her quest to regain her Hexenbiest abilities.
A series of disturbing crime scenes leads Nick and Hank to the resurrection of an old feud that's all too familiar for Nick and Monroe. With the news of a royal family member's demise, several key players start to make their move. Meanwhile despite his recent trauma, Nick finds himself healthier than normal and Monroe and Rosalee talk about moving their relationship forward.
When Nick and Hank investigate a drowning death with mysterious marks on the victim’s ankles, they happen upon a group of water-bound Wesen with a deadly postcoital cuddle. Meanwhile, Rosalee starts unpacking her things at Monroe’s, and Captain Renard makes a startling realization about the possible identities of the Royal Baby’s parents.
Nick and Hank are on the case as repeat instances of apparent vigilantism have whispers of an old Spanish legend making their way through a working-class Portland neighborhood. Elsewhere, Juliette learns the truth about Nick’s mother. Meanwhile, Adalind has a brief scare during her ultrasound.
Nick faces his toughest challenge yet when he and Hank investigate a case that combines religious phenomenon with the dark dealings of the Wesen Council. Meanwhile, Rosalee is torn when Nick's case challenges her Wesen loyalties. Elsewhere, Captain Renard leaves town to tend to some "family matters."
As a deadly crime spree begins to surface, a century-old urban legend takes shape in Portland's sewers and becomes Nick's latest case. In Europe, Adalind meets Prince Viktor, who’s come to bring those responsible for his cousin Eric’s demise to justice. Meanwhile, Captain Renard responds to the recent attempt on his life.
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 and Hank take things a little too far. Meanwhile, Monroe enlists Juliet to surprise Rosalee for their first Christmas together with unintended results. Elsewhere, Captain Renard’s tour of Europe brings him closer to tracking down Adalind.
Nick and Hank investigate a Wesen "healer" whose ability holds risks that far outweigh its rewards. Meanwhile, Juliette takes in a friend when domestic issues escalate and Hank makes a move on his physical therapist Zuri. Elsewhere, Captain Renard finally tracks down Adalind and has a stern warning for her.
Nick and Hank are called to the scene of a gang-related homicide. The case escalates as Zuri, Hank’s physical therapist, and her brother get caught up in the investigation. Meanwhile, Juliette seeks advice from Rosalee in dealing with the news that her friend is Wesen.
Nick and Hank are called to the gruesome murder of a veteran working in home security. During their investigation, they discover this might be one of several revenge killings regarding a horrifying cover-up involving members of the army and military contractors. On the domestic front, Monroe accompanies Rosalee during her long overdue reunion with her mother and sister. In Europe, Adalind sees hints of what she thinks might be her powers returning.
Nick and Hank investigate a cop killer who scalps his victims. Meanwhile, Juliette begins to communicate with Nick's mom via email and Adalind finds herself much closer to delivering her baby than she previously thought. Elsewhere, Monroe's parents decide to surprise him and Rosalee with an early arrival to Portland after learning some exciting news.
Monroe fights an impossible battle to convince his parents to embrace the life choices he’s made. Meanwhile, Nick turns to Juliette to help him figure out the Wesen aspect of his cop-killing scalper investigation. On the Royal Baby front, Captain Renard learns new information that forces him to contact Adalind in the interest of keeping her and the baby safe from Viktor.
A horrible new predator creeps into Portland with its sight set on a young expectant couple who are close friends of Sgt. Wu. Nick and Hank must figure out how to deal with Wu as the investigation escalates. Meanwhile, Adalind prepares for a special delivery while her enemies are hot on her trail.
Nick and Hank find themselves thrown into the middle of an ancient battle and things heat up when the Wesen Council decides to get involved. Monroe and Rosalee fill everyone in on early Wesen history. Meanwhile, Sgt. Wu 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.
A double homicide leads Nick and Hank to a traveling carnival where the performers are not what they seem. To get a better understanding of what's going on behind the scenes Monroe and Rosalee go undercover. On the wedding front, Monroe has a really important question for Nick. In Austria, an invaluable member of the Resistance makes the ultimate sacrifice to help Adalind.
The Resistance's plan to keep Adalind safe gets kicked into high gear when an unexpected ally arrives to ensure she and the baby make it out of Europe safely. In Portland, as Monroe and Rosalee prepare for their upcoming wedding, Nick and Juliette are reminded of their failed proposal.
Nick and his mom, Kelly Burkhardt, join forces to protect Adalind's baby. Meanwhile, Prince Viktor activates a deadly stateside asset to find Adalind and her child.
Nick and Hank investigate a dangerous female suspect leaving a trail of Wesen in her wake. Elsewhere, Adalind takes measures into her own hands, even if that means forging a dangerous alliance.
Nick does his best to educate Trubel on how best to handle the world she is learning about for the first time, and decides it best to bring her on a ride along with Hank. They find themselves investigating the homicide of a young woman that strikes a chord for Trubel. Meanwhile, Adalind makes a discovery that she hopes will lead her to regain something she has lost.
Nick and Hank are called to investigate a double homicide, and quickly learn the victims were from a special section of the Verrat tasked with finding rare objects pertaining to the Wesen world. Trubel gets involved with a mysterious father-and-son tandem that crossed the country in a desperate attempt to deliver invaluable cargo to "the Portland Grimm." Meanwhile, Captain Renard begins to grow suspicious of Adalind's recent behavior and quietly decides to put extra eyes on her.
It's Monroe and Rosalee's big day and their joy will only be matched by unexpected heartache for those around them. Nick and Juliette make a startling realization that could shake their relationship to its core. Meanwhile, Adalind proceeds with a delicately laid plan that leads to a catastrophic event that will alter the course of Nick's journey.
Nick is forced into hiding after Captain Renard pins multiple Black Claw deaths on him, making him a wanted man.
Hank and Wu find a solution to stop Renard while Nick is still on the run. Adalind receives a phone call that throws her into the middle of everything. Back at the spice shop, Monroe and Rosalee's adventure in babysitting takes an interesting turn when Diana demonstrates her power. Meanwhile, Eve and Trubel work to solve the mystery of the cloth found with the healing stick.
In order to stop the rise of Capt. Renard, Nick devises a plan that will take him out of his element. Adalind and Monroe do everything in their power to keep the plan on track. Meanwhile, Eve and Rosalee race against time to get the spell ready before it is too late.
Nick, Hank and Wu investigate a terrifying new Wesen who terrorizes a young family and has a surprising motive. Capt. Renard is reeling after an unexpected guest appears. Meanwhile, Diana has some interesting news for Monroe and Rosalee. Elsewhere, Eve returns to the catacombs beneath Nick’s loft to search for answers to her bizarre visions and side effects from being healed by the mysterious stick.
Nick and Hank join Wu to investigate a bizarre murder in a local park. Elsewhere, Capt. Renard continues to deal with a ghost from his past. Meanwhile, Monroe and Rosalee visit the doctor to see if Diana's premonition is true. Back at the loft, Adalind finds a very weak Eve in the tunnels and mysterious drawings scrawled on the walls.
Rosalee surprises Monroe with a getaway for his birthday and invites most of the gang to join them. Things take a shocking turn when a hotel employee targets Nick in an effort to avenge his father. Meanwhile, Eve gets a visit from a dark force that she has seen before. Elsewhere, Capt. Renard spends the weekend with Diana when a former ally decides to get even.
Deadly attacks on a team of scientists lead Nick, Hank and Wu on a investigation unlike any they have had before. Meanwhile, as the research continues into the origins of the cloth, Monroe and Rosalee learn that Eve is still feeling the after effects of the death grip. Elsewhere, Capt. Renard reaches out to an old friend to get answers to the origins of the symbols drawn by Diana.
Nick, Hank and Wu are called to the scene of the crime where a man claims his friend was consumed by a tree-like figure. Meanwhile, after the gang learns of Eve's disturbing mirror encounter, everyone takes extra precautions. Elsewhere, Capt. Renard searches for answers to what Diana was drawing.
After a series of brutal and deadly attacks, Nick and Hank find an unlikely lead in a local nursing home. Meanwhile, Eve goes to Adalind to get answers that only a Hexenbiest can provide. Elsewhere, Capt. Renard confronts Nick about the mysterious symbols and tries to strike a deal.
Eve goes on a mission to take on the mysterious force she saw in the mirror and finds herself in unfamiliar territory. When the gang discovers what she has done, Nick finds a way to join her. Meanwhile, an uneasy alliance is established when Capt. Renard is brought in to help and discovers this all may be connected to the person he cares for the most, Diana.
The prophecy that was uncovered comes to pass when a dark force arrives in Portland with its eyes set on Diana. In an effort to protect her, Nick, along with Capt. Renard and Adalind, returns to the scene of his first investigation as a Grimm. Back at the Spice Shop, Monroe, Eve and Rosalee make a discovery that uncovers the origins of the mysterious stick. Meanwhile, Hank and Wu are called to a crime scene that is connected to the gang's greatest threat.
In the series finale, Nick faces off against his greatest foe yet as it seems no weapon can defeat him. At the Spice Shop, Monroe, Rosalee and Eve search for answers and stumble upon a rare potion that may help the fight. Elsewhere, Capt. Renard and Adalind try to keep Diana and baby Kelly safe as the threat has its eyes set on the children.
Nick must look inside himself and decide who he wants to be while also dealing with fathering a child with Adalind.
Nick makes changes to keep Adalind and his child safe, with the help of Monroe and Rosalee. Hank and his new partner investigate a murder at an investment group.
Rosalee disappears after some orphans decide she is the mother figure they always wanted and an encounter with a former colleague prompts Adalind to consider going back to work.
A wealthy mobster entices three young men to work for his daughter's hand in marriage, and a surprise visitor shakes things up as Nick and Adalind struggle to adjust to home life.
Nick and Hank are called to the scene when three Wesen go out on a hunt at a local dump and get more than they bargained for when two turn up dead after they encounter the mythical Rat King. Meanwhile, a very badly wounded Trubel is taken to the hospital and Nick finally meets Meisner.
Nick and Hank investigate a wave of coordinated Wesen gang vandalism that results in the death of a local business owner and the kidnapping of Monroe and Rosalee's friend. As they dig deeper, they learn that Portland wasn't the only city hit with a wave of violence. Meanwhile, Truble fills Nick and Adalind on what she has been up to. Elsewhere, Capt. Renard dips his toes into politics as he endorses a local candidate.
Nick and the gang are still reeling from the scope of the ambush and the surprise return of "Juliette", but not everything is as it seems. In light of the heightened Wesen violence, Monroe and Rosalee seek answers from the Wesen Council. Meanwhile, Trubel has some information for Nick that will help him get what he is looking for.
A local legend comes back to life as Nick and Hank investigate a mysterious sighting linked to a tourist's death at a local lake. Rosalee's past comes back to haunt her. Elsewhere, Capt. Renard continues to support a candidate for mayor. Meanwhile, Nick is shown the scope of the Wesen uprising as the secret government agency takes him into the heart of their Portland operations center.
A barbaric Wesen ritual is brought to the present and Nick, Hank and Wu are already five steps behind the serial killer. To aid in the investigation, Monroe goes undercover. Meanwhile, Hadrian's Wall's war against Black Claw intensifies as Eve uses her unique skills to interrogate a suspect.
Monroe gets a call from a relative in Germany that will bring Nick closer to his ancestors. Things get complicated when the nefarious group Black Claw is also after the same artifacts. Elsewhere, Capt. Renard helps a mayoral candidate get an edge on his opponent. Meanwhile, Trubel confronts Eve about Nick and Adalind.
Newly gained artifacts take Nick and Monroe closer to the source of a long-gestating mystery. Elsewhere, Black Claw makes a deadly move that will send Portland into disarray.
Nick and Monroe find a treasure in Germany that has been hidden for centuries. Back in Portland, Capt. Renard joins Hank and Wu to track down a deadly assassin who has thrown Portland into havoc. Little do they know that Eve is on a hunt of her own for the same man. Meanwhile, someone from Rosalee's past tracks her down.
A local maskmaker is targeting Wesen to create Luchador masks that bestows great power to its wearer. As Nick, Hank, Monroe and Rosalee work to stop the killings, Capt. Renard considers an offer that will bring him closer to claiming his destiny. Meanwhile, Eve's further investigation of a recent incident raises new questions.
Following a brutal attack in the woods, Nick and Hank stumble upon a terrifying Wesen disease that may be the inspiration for the modern-day werewolf myth. Meanwhile, Adalind is offered an uneasy alliance that may help her get back what she wants most. Elsewhere, Eve's investigation uncovers a surprising revelation.
When Nick and Hank come across a beautiful young woman who seems to have aged 70 years overnight and died, they suspect Wesen involvement. The investigation leads to a local doctor and Rosalee is enlisted to help find the truth. Meanwhile, Eve takes bold steps to learn more about Capt. Renard's nefarious dealings.
An evangelical preacher has a tent revival unlike any other when he uses his Wesen identity to gain more believers. Nick and Hank are called to the scene as things escalate when a group of "true believers" are hell bent on saving the preacher and his flock by any means necessary. Meanwhile, Capt. Renard takes further steps to gain power in local government. Elsewhere, Eve uses Adalind's ol' hat trick to gain more access to Black Claw.
When the severed head of a young man is found under a bridge, Nick and Hank find themselves on the case of Japanese Wesen acting on an ancient tradition of revenge. Elsewhere, Adalind decides to go back to work at her old law firm and has her first face-to-face with Eve.
When a man is found dead with all of the bones in his body seemingly liquefied and removed, Nick and Hank find themselves in the middle of a gruesome family arrangement. Meanwhile, Wu deals with a crisis of his own and Hank reunites with his old flame, Zuri.
Suffering from the bite he sustained, Sargeant Wu becomes entangled in a surprising altercation that may land him in hot water. After meeting the mysterious Bonaparte (Shaun Toub), Adalind is faced with a difficult decision that could change her and Nick's lives forever. Meanwhile, Hank gets even closer to Zuri and their relationship begins to take shape. Back at HW, Eve senses that a new force may jeopardize the entire operation.
Black Claw makes a strategic move against Hank that shocks everyone and sends Nick on a war path. Hadrian's Wall ramps up their investigation as they seek out a mysterious man named Bonaparte. Meanwhile, Adalind and Capt. Renard must learn to deal with their new and very unpredictable reality with Diana.
Nick leans on Monroe and Rosalee as he worries that he may lose everything as he continues to battle Black Claw. Captain Renard ramps up his campaign as election day nears. Elsewhere, Adalind is faced with a very difficult decision in order to protect her children. Meanwhile, Hank's relationship with Zuri takes an unexpected turn and Sargeant Wu tries to gain control of his new reality.
Nick adjusts to his new reality and tries to figure out how to deal with Trubel. Wu has an unpleasant flashback. A new group of Wesen come to Portland and steal people's memories. Captain Renard fights for his life. Adalind's desperation to find her child lands her in Prince Viktor's clutches.
As Nick and Hank turn their attention to a string of attacks where victims are left without their memories, Nick weighs whether or not he should regain his Grimm abilities. Trubel joins the investigation and puts herself in harms way. Adalind is held captive and learns that she is more connected than ever to Nick. Captain Renard continues to fight for his life as a mysterious visitor arrives to help him.
After Nick has a bizarre, unsettling vision, he and Hank find themselves on a case that takes them into the world of boxing. Trubel finds herself under the watchful eye of Agent Chavez before jumping into the ring to help with Nick's investigation. Monroe and Rosalee get some unexpected help in figuring out a way to restore Nick's Grimm abilities. Adalind encounters a mysterious visitor in her dungeon cell.
Nick and Hank are called to an unusual crime scene with a victim who appears to have died from clay-induced asphyxiation. Wu begins to grow more suspicious of Trubel’s presence. Elizabeth makes a major breakthrough with regards to restoring Nick’s powers. Monroe and Rosalee experience cultural backlash as a result of their inter-Wesen marriage. Adalind hopes that putting trust in her mysterious visitor will help her escape the dungeon.
A woman claims a very persistent, talking wolf drove her to the point of madness when she's questioned by Nick and Hank after committing a deadly crime. Meanwhile, Nick and Juliette wonder if getting his Grimm powers back is worth the sacrifice of a normal life; at the same time, Bud hopes Trubel can help with a wesen-related issue; threats against Monroe and Rosalee intensify; and Adalind's perilous trek to retrieve her daughter continues in Austria.
The justification for Nick to become a Grimm again is made much clearer in the wake of the most recent attack against Monroe and Rosalee. At work, Nick and Hank are called to a stretch of highway that acts as a staging area for a horrifying Wesen ritual. In Vienna, Viktor meets with a completely broken Adalind, now ready to be of assistance in finding and retrieving the baby. Meanwhile, Trubel is surprised by the sudden arrival of an old friend.
Nick and Hank are called to investigate a bizarre string of home invasions that lead to an even stranger Wesen phenomena. Monroe has a very special Christmas surprise in store for Rosalee. Meanwhile, Truble comes to a life changing realization that will affect everyone.
An unsuspecting traveler brings a blood-sucking legend with him to Portland, and Nick and Hank find themselves investigating the gruesome trail of "El Chupacabra." Meanwhile, Monroe and Rosalee prepare to leave for their long-overdue honeymoon as they are met with more threats regarding their marriage. Elsewhere, Viktor and Adalind decide to take a trip of their own, while Wu decides to confront Nick about what he has been seeing.
Nick and Hank must save Monroe from the Secundum Naturae Ordinem Wesen while Juliette considers life as a Hexenbiest.
After Monroe’s abduction by the Wesenrein, Nick gathers the whole team, including Wu, to track him down and return him to Rosalee. As the search intensifies, Juliette learns more about her new reality as a Hexenbiest.
Monroe and Rosalee are finally off on their honeymoon, but that doesn’t mean trouble isn’t stirring in Portland. Nick and Hank are called to a shocking homicide at an abandoned residence many Portland locals think is haunted. Even the survivors of the attack swear a ghost committed the murder. Meanwhile, on the heels of Juliette’s startling revelation Captain Renard seeks the help of a mystical woman from his past.
Nick and Hank investigate a series of murders that lead back to the Wesen Council and a mysterious bounty hunter. Juliette’s meeting with Henrietta brings about more disturbing news than she was expecting. Adalind and Viktor make their way back to Portland.
When an arson case looks to have Wesen origins, Nick find himself reluctantly having to ask an old foe for help. Viktor teaches Adalind the effectiveness of well-played diplomacy. Juliette finds herself in a confrontation sooner than expected.
Nick and Hank investigate a murder victim with his foot cut off, and stumble onto a disturbing Wesen take on the "lucky rabbit’s foot." In an effort to help, Monroe and Rosalee go undercover. Meanwhile, the fallout from Adalind and Juliette’s showdown still has Nick reeling and sends him on a path that leads to Henrietta.
Nick and Hank are called to investigate a one night stand turned deadly when a man finds himself in the middle of a very bizarre love triangle. Captain Renard hopes Monroe and Rosalee can help him deal with recurring episodes of phantom bleeding. Meanwhile, Adalind makes a discovery that might turn the tables in her favor and Juliette makes a big decision that could change the course of her relationship with Nick.
A cyclist's homicide introduces Nick and Hank to a Wesen with a tragic fatal touch. Captain Renard and Adalind learn the Royals have stepped up their efforts to find their child, and another member of the Royal family is introduced. Meanwhile, Juliette ponders the idea of embracing what she's become as opposed to fighting it.
Nick and Hank are called to investigate a rare Wesen that leaves its victims frozen solid. Meanwhile, Juliette starts to feel that she is losing her humanity as she seeks to get revenge on Adalind. Elsewhere, Captain Renard continues to suffer from mysterious bleeding and visions while Monroe works toward coming to grips with the Wesenrein incident.
A string of homicides have the press asking Captain Renard if a Jack the Ripper copycat has arrived in Portland. While dealing with the investigation, Nick, Hank, Monroe and Wu deal with a situation they never expected. Meanwhile, Adalind and Rosalee must work together on a last ditch attempt to fix Juliette's condition. Elsewhere, Juliette decides to help her new ally even if it means hurting those around her.
While investigating a grisly murder, Nick and Hank get closer to uncovering the identity of the serial killer while Wu's life is put in grave danger. Having turned down Monroe and Rosalee's offer, Juliette solidifies a new alliance as she works to get her revenge. Elsewhere, Trubel makes a surprising return to Portland.
On the heels of a shocking discovery, Nick is hell bent on getting revenge and taking the fight to the Royals with help from Trubel. Meanwhile, Juliette's alliance continues to lead her down a dark path.
A homicide leads Nick and Hank onto the dark and mysterious path of a local Native American power quest. Meanwhile, Juliette's erratic behavior lands her on the wrong side of the law. At the spice shop, Rosalee and Monroe are on a mission and call on Captain Renard for help.