Nick Burkhardt, a promising Portland homicide detective, told nobody he's been seeing visions of people 'transforming' into monsters when he looks at them. While investigating the murder and disappearance of two girls, he realizes it's a Grimm family gift, which passes from his aunt Marie Kessler when she is dying from cancer. She also gives him a mysterious key. Nick becomes her attacker's next target, narrowly escaping. Nick discreetly uses his gift to track down a postman, who turns out to be a descendant of werewolf lineage, and who helps him find the violent monster.

A case of breaking and entering introduces Nick and Hank to a mysterious family whose cultural background blurs the line of right and wrong. Meanwhile, Nick tasks Monroe with safeguarding Aunt Marie.

During a flash-mob on a bus, a lawyer is killed with a stunning overdose of bee venom, but it fits no geographical origin. Monroe and the Grim records help Nick work out it must be the work of a feral bee queen, the sworn enemy of Hexenbiests like Adalind. Trailing a professor-beekeeper and the other twelve attendants of a bee-keeping convention, Nick and his partner Hank find them congregating and get attacked by an unnatural bee swarm.

Nick investigates the death of a music teacher who was eaten alive by rats whille locked in his own car. Nick and Hank are led to a expelled music prodigy who has a strange sort for vengeance against those who wronged him.

Nick investigates the robbery of a spice shop, that is owned by wesen, discovering that the thieves were after a dangerous drug.

Nick and Juliette go away for a little R & R. They meet a couple who turns out to be not human. Juliette meets the wife and senses she's being abused. Nick learns the man is a being who abuses women.

Nick is in the trailer trying to find out what the key that he received from his aunt might open. Juliette calls him telling that Hank has invited them to have dinner together with Adalind. Captain Renard is forced by a criminal with a weapon to go with him to meet his cousin, but he reacts and kills them both. When Nick meets Adalind, he recalls that she wanted to kill his aunt and he confronts her near the restrooms. But he is called to investigate the murder of the two men and leaves the restaurant. Meanwhile Renard goes to the house of Catherine and she tells him that her daughter will get the Grimm's key for him. Nick meets with Monroe and Rosalee and Rosalee discovers what Adalind gave to Hank. Will she be capable to prepare an antidote and save his life?

A Schakal Wesen wreaks havoc while searching for the ancient Zakynthos gold coins, while a mysterious woman in black tracks his movements. Nick informs a dubious Juliette of his heritage just before she collapses and is hospitalized because of a poisonous scratch from Adalind's cat.

An unsettling murder scene leads Nick and Hank to what looks like a bitter custody battle.

Even Nick is puzzled by the case of two murdered teenage favorite candidates to the high-school general knowledge quiz qualifying for the state competition. Wesen in the story belong to several species, one extremely rare. Captain Sean Renard wins a community prize and turns to Monroe for a medicinal cure for his sexual obsession with Juliette Silverton. Surviving competitor Pierce Higgins is actually an unwitting Wesen cross breed. In Vienna, Renard's brother, Prince Eric, confides unto his latest conquest.

Nick is shocked about Juliette's infidelity, which she can't explain, yet sort of accepts it and ends up moving out to his heritage trailer. Monroe realizes from a TV appearance that Juliette's partner, who ordered an obsession cure, is none other than Police Captain Sean Renard and ends up telling Nick. Meanwhile Adalind and a pack of canine Wesen almost hunt down Renard for the key, and he locates Nick's trailer after allowing him to lock up Adalind.

Once Monroe shows him that Renard is Juliette's lover, Nick can barely control the urge for illegal revenge. Assisted by just returned Rosalee, Monroe works out how the passion spell can be broken, and ultimately Renard convinces Nick they must work together. Meanwhile Adalind is released for lack of evidence and returns to Renard's traitor brother in Vienna, without the key, not knowing Renard found and stole it from Nick's desk.

Those grieving for a deceased loved one becomes the target of a revolting fly-like Wesen who feeds on tears and leaves behind a deadly parasite.

After sleeping on it Nick decides it would be best for Monroe to take Juliette to the trailer. However, the trailer triggers more memories of Nick than Juliette may be able to handle leading her to seek the help of Pilar for insights into her current condition. Meanwhile Monroe fears Rosalee, who is serving jury duty, maybe under the influence of a toad dropping Ziegevolk who is jury tampering to win his case. Nick, Hank, Bud, Monroe and Rosalee hatch a plan to stop this Ziefevolk once and for all.

A young geologist is gruesomely burned after collecting rock samples from a nearby volcano, and it finds Nick and the rest trying to stop a demonic Beast who is literally hot to the touch.

A mysterious drug related force begins to turn residents of Portland into feral zombies, meanwhile, Juliette learns more of the wesen community in the spice shop.

Nick is back on lovers' terms with Juliette, who remains eager to learn about ferals. Nick must however give priority to the violent crime wave caused by zombies. As he feared, they are created by the voodoo 'baron', who sets a trap as instructed. Captain Sean Renard informs Nick about his mistrusting meeting with visiting European royal half-brother Eric and the counterfeit documents Eric had prepared at the castle. Still in Vienna, Adalind, poisoned by Pech to switch appearances, is seen roughly overtaken by the gypsy witch's family Popescu. Rosalee prepares a zombie antidote, but once tracked down in the port, the superior zombie numbers corner down Nick's party.

Nick's destiny is uncertain as zombies continue to overrun Portland.

Monroe (Silas Weir Mitchell), Hank (Russell Hornsby), Rosalee (Bree Turner) and Juliette (Bitsie Tulloch) track down a manic Nick (David Giuntoli) 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 (Sasha Roiz) does his best to clean up the zombie fallout on all fronts - domestic and international. Elsewhere, the more time Adalind (Claire Coffee) spends with Stefania (guest star Shohreh Aghdashloo), the more disturbing things seem to get in her quest to regain her Hexenbiest abilities.

A series of disturbing crime scenes leads Nick (David Giuntoli) and Hank (Russell Hornsby) to the resurrection of an old feud that's all too familiar for Nick and Monroe (Silas Weir Mitchell). 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 (Bree Turner) talk about moving their relationship forward.

When Nick (David Giuntoli) and Hank (Russell Hornsby) investigate a drowning death with mysterious marks on the victim's ankles, they happen upon a group of water-bound Wesen. Meanwhile, Rosalee (Bree Turner) starts unpacking her things at Monroe's (Silas Weir Mitchell), and Captain Renard (Sasha Roiz) makes a startling realization about the possible identities of the Royal Baby's parents.

When investigating a series of brutal murders committed on criminals, to Nick it appears that the culprit may be a character from a Latino legend.

Nick and Hank look into the death of a priest, who was performing an exorcism on a 9-year-old boy. Is the boy a Wesen or possessed by a demon?

An old urban legend from within Portland sewers comes to light when a murder is committed by an vicious, alligator-like wesen.

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 Juliette to surprise Rosalee for their first Christmas together with unintended results. Elsewhere, Captain Renards tour of Europe brings him closer to tracking down Adalind.

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 (David Giuntoli) and Hank (Russell Hornsby) 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 (Silas Weir Mitchell) accompanies Rosalee (Bree Turner) during her long overdue reunion with her mother and sister. In Europe, Adalind (Claire Coffee) sees hints of what she thinks might be her powers returning.

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.

Monroe (Silas Weir Mitchell) fights an impossible battle to convince his parents (guest stars Dee Wallace and Chris Mulkey) to embrace the life choices he's made. Meanwhile, Nick (David Giuntoli) turns to Juliette (Bitsie Tulloch) to help him figure out the Wesen aspect of his cop-killing scalper investigation. On the Royal Baby front, Captain Renard (Sasha Roiz) learns new information that forces him to contact Adalind (Claire Coffee) in the interest of keeping her and the baby safe from Viktor (guest star Alexis Denisof).

A horrible new predator creeps into Portland with its sight set on a young expectant couple who are close friends of Sgt. Wu (Reggie Lee). Nick (David Giuntoli) and Hank (Russell Hornsby) must figure out how to deal with Wu as the investigation escalates. Meanwhile, Adalind (Claire Coffee) prepares for a special delivery while her enemies are hot on her trail.

Nick, Hank and Juliette learn what the Wesen Community already know, the Wesen were GODS in ancient Egypt Meanwhile, Adalind and Meisner again run for their lives after a tortured Sebastien reveals the location where he dropped them off. Sgt. Wu, still fighting for his sanity is visited by Juliette. She tells Wu of her ordeal, which seems to have helped him because Wu is later picked up and taken home by Nick and Hank.

A double homicide leads Nick (David Giuntoli) and Hank (Russell Hornsby) 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 (Silas Weir Mitchell) and Rosalee (Bree Turner) 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 (Claire Coffee).

Nick's mother Kelly returns to help Adalind escape Europe with her baby. Meanwhile, Monroe and Rosalee prepare for their wedding.

The Verrat find out that Adelind and her baby have gone to Captain Sean Renard for help. Nick enlists the help of Monroe and Rosalee to keep Adalind safe, as his mother figures how to deal with the Royals.

Nick (David Giuntoli) and Hank (Russell Hornsby) investigate a dangerous female suspect (guest star Jacqueline Toboni) leaving a trail of Wesen in her wake. Elsewhere, Adalind (Claire Coffee) takes measures into her own hands, even if that means forging a dangerous alliance.

Nick (David Giuntoli) does his best to educate Trubel (guest star Jacqueline Toboni) 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 (Russell Hornsby). They find themselves investigating the homicide of a young woman that strikes a chord for Trubel. Meanwhile, Adalind (Claire Coffee) 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 (Silas Weir Mitchell) and Rosalee's (Bree Turner) big day and their joy will only be matched by unexpected heartache for those around them. Nick (David Giuntoli) and Juliette (Bitsie Tulloch) make a startling realization that could shake their relationship to its core. Meanwhile, Adalind (Claire Coffee) proceeds with a delicately laid plan that leads to a catastrophic event that will alter the course of Nick's journey.

The Gedächtnis Esser continues to steal memories and Captain Renard's mother visits him in the hospital to try to save his life. Meanwhile Wu confronts Nick about Trubel and Nick and Adalind share a psychic connection.

Nick's power loss aftermath showed that the changes are far more than anticipated, Elizabeth, Monroe and Rosalee look for the cure. Nick and Hank call on Trubel to help out on a case.

A rabbi raises a golem to protect his nephew, but he can't control it. Elizabeth successfully recreates Adalind's spell, but it still requires a key ingredient.

A woman claims a persistent talking wolf drove her to madness; Juliette and Nick weigh the potential costs of getting back his abilities, and the threats against Rosalee and Monroe get worse.

With Monroe and Rosalie are dealing with a growing problem from Wesen purists, Nick and Juliette must decide if a normal life is really what they want.

An unsuspecting traveler brings a blood-sucking legend with him to Portland, and Nick (David Giuntoli) and Hank (Russell Hornsby) find themselves investigating the gruesome trail of "El Chupacabra." Meanwhile, Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) prepare to leave for their long-overdue honeymoon as they are met with more threats regarding their marriage. Elsewhere, Viktor (guest star Alexis Denisof) and Adalind (Claire Coffee) decide to take a trip of their own, while Wu (Reggie Lee) decides to confront Nick about what he has been seeing.

The Wesenrein act on their many threats against Monroe and Rosalee's marriage. Meanwhile, Nick and Hank bring Wu to a place where he's sure to find the answers he's looking for. Elsewhere, Juliette tries to come to grips with her new reality.

Nick and Hank investigate a series of murders that lead back to the Wesen Council and a mysterious bounty hunter.

While Nick and Hank investigate the deaths of two teenagers in an arson case they realize they need the help of someone that Nick had arrested several years ago.

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 (David Giuntoli) and Hank (Russell Hornsby) 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 (Sasha Roiz) hopes Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) can help him deal with recurring episodes of phantom bleeding. Meanwhile, Adalind (Claire Coffee) makes a discovery that might turn the tables in her favor and Juliette (Bitsie Tulloch) makes a big decision that could change the course of her relationship with Nick.

A cyclist's homicide introduces Nick (David Giuntoli) and Hank (Russell Hornsby) to a Wesen with a tragic fatal touch. Captain Renard (Sasha Roiz) and Adalind (Claire Coffee) learn the Royals have stepped up their efforts to find their child, and another member of the Royal family (guest star Nico Evers-Swindell) is introduced. Meanwhile, Juliette (Bitsie Tulloch) ponders the idea of embracing what she's become as opposed to fighting it.

Nick and Hank investigate a rare wesen that leaves victims frozen; Juliette seeks revenge.

An investigation leads Nick and Hank to the path of a Native American power quest.

Nick and Hank investigate a homicide they discover is linked to a wesen rite of passage.

The press thinks a Jack the Ripper copycat is responsible for a series of recent homicides.

As Hank and Nick get close to identifying a vicious serial killer, Wu's life is put into jeopardy.

After a horrifying discovery leaves Nick stunned, he is determined to get revenge.

Nick must look inside himself and decide who he wants to be while also dealing with fathering a child with Adalind.

Nick deals with his new home life as he tries to keep his child and Adalind safe.

Rosalee goes missing after a band of orphaned children target her as the mother figure they have always wanted. With a furious Monroe by their side, Nick and Hank race against the clock to find Rosalee.

A wealthy mobster sets three young men on a quest to win his daughter Emily's hand in marriage and earn his fortune.

Nick and Hank are called to a local dump after some Wesen have a deadly encounter with the mythical Rat King.

Monroe is in danger when Wesen business owners are targeted in a string of attacks being investigated by Nick and Hank. Trubel catches Nick and Adalind up on her recent activities. Captain Renard endorses a political candidate.

After surviving a wesen ambush from a terrorist cell known as the Black Claw, Nick discovers "Juliette" is still alive, but learns what Chavez and Meisner were doing to her. The group interrogates Xavier. The group soon learns these attacks go beyond Portland. An attack occurs at the Wesen Council.

The legend of the Lake Monster 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.

Nick and Hank race against time to prevent the completion of an ancient Wesen ritual that requires seven sacrificial murders. Meisner, Trubel, and Eve track a suspected Black Claw agent's arrival in Portland.

Monroe receives a call from a relative in Germany that will bring Nick closer to his ancestors. Complications arise when the nefarious group Black Claw also takes an interest in this discovery.

Artifacts take Monroe and Nick closer to the heart of a mystery; a deadly move could send Portland into chaos.

Nick and Monroe discover the hidden treasure in the Black Forest. A figure from Rosalee's past comes back to haunt her. The hexenbiest suppression on Adalind begins to wear off. Renard, Hank, and Wu hunt down an assassin.

A down on his luck Luchador receives a special mask that will make him the star he's always wanted to be. Misuse, however, leads to terrible consequences. Meanwhile, Eve believes something is amiss with Dixon's assassination.

Nick and Hank investigate an attack which leads them to a wesen disease that makes blutbad rabid every full moon. Eve discovers the Black Claw want to recruit Sean into their cause.

A beauty regimen proves deadly for a young woman, who seems to have aged 70 years when Nick and Hank find her lifeless body. As they search for proof of Wesen involvement, they are led to a local doctor, and end up enlisting Rosalee's help in their investigation. Meanwhile, Eve takes a bold step to learn more about Capt. Renard's nefarious dealings.

Nick investigates a traveling preacher who uses his wesen identity to gain followers after one of his bodyguards winds up dead, while a religious sect is seeking to capture him. Eve uses Renards body to further investigate the Black Claw.

Local youths are in danger from a Japanese Wesen looking for revenge; and Adalind crosses paths with Eve.

Nick, Hank and Wu searches for a wesen killer who can liquefy human bones; Hank encounters an old flame.

Wu discovers he is infected with lycanthropia after being attacked by a Skalengeck from Black Claw. Trubel returns and Adalind leaves Nick to join Renard/Black Claw in order to protect not only her children but Nick as well.

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.

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

The war with Black Claw escalates as Nick and his friends are targeted for elimination.

Captain Renard vows to kill Nick following the massacre in Nick's loft.

Hank and Wu find a solution to stop Renard while Nick is still fleeing. Adalind gets a phone call that throws her into the middle of everything. Monroe's and Rosalee's babysitting adventure turns interesting as they witness Diana's power.

Nick devises a plan that will take Capt. Renard out of his element; Adalind and Monroe attempt to keep the plan on track; Eve and Rosalee race to get the spell ready in time.

A menacing new Wesen terrorizes a young family; Capt. Renard is shocked by an unexpected guest; Diana has news for Monroe and Rosalee; Eve looks for answers relating to her strange visions and side effects after being healed by the stick.

Nick (David Giuntoli) and Hank (Russell Hornsby) join Wu (Reggie Lee) to investigate a bizarre murder in a local park. Elsewhere, Capt. Renard (Sasha Roiz) continues to deal with a ghost from his past. Meanwhile, Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) visit the doctor to see if Diana's (guest star Hannah R. Loyd) premonition is true. Back at the loft, Adalind (Claire Coffee) finds a very weak Eve (Bitsie Tulloch) in the tunnels and mysterious drawings scrawled on the walls.

Rosalee surprises Monroe with a birthday getaway and invites the gang to join them; at a hotel, an employee targets Nick to avenge his father; Eve is visited by a familiar dark force; Capt. Renard spends the weekend with Diana.

Nick, Hank and Wu search the woods for a tree-like Wesen dedicated to protecting Mother Nature, while Capt. Renard seeks insight into Diana's drawings.

A series of brutal murders lead to an unlikely lead in a nursing home. Eve goes to Adelind to see if there is a Hexenbiest way to travel through mirrors. Renard wants answers about the symbols that Diana has been drawing.

Eve embarks on a mission to take on the mysterious force she saw in the mirror.

A powerful Wesen named Zerstörer arrives in Portland, planning to do something with Diana. Nick returns to the house where he solved his first Wesen case to find a solution. However, Zerstörer is one step ahead of the gang.

Nick faces off against his greatest foe, yet as it seems no weapon can defeat him. Monroe, Rosalee and Eve search for answers that may help them in the fight. Renard and Adalind try to keep Diana and Kelly safe

The press thinks a Jack the Ripper copycat is responsible for a series of recent homicides.

A wealthy mobster sets three young men on a quest to win his daughter Emily's hand in marriage and earn his fortune.

Nick and Hank race against time to prevent the completion of an ancient Wesen ritual that requires seven sacrificial murders. Meisner, Trubel, and Eve track a suspected Black Claw agent's arrival in Portland.

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.

The Verrat find out that Adelind and her baby have gone to Captain Sean Renard for help. Nick enlists the help of Monroe and Rosalee to keep Adalind safe, as his mother figures how to deal with the Royals.

Nick deals with his new home life as he tries to keep his child and Adalind safe.

Once Monroe shows him that Renard is Juliette's lover, Nick can barely control the urge for illegal revenge. Assisted by just returned Rosalee, Monroe works out how the passion spell can be broken, and ultimately Renard convinces Nick they must work together. Meanwhile Adalind is released for lack of evidence and returns to Renard's traitor brother in Vienna, without the key, not knowing Renard found and stole it from Nick's desk.

After surviving a wesen ambush from a terrorist cell known as the Black Claw, Nick discovers "Juliette" is still alive, but learns what Chavez and Meisner were doing to her. The group interrogates Xavier. The group soon learns these attacks go beyond Portland. An attack occurs at the Wesen Council.

Nick and Hank investigate a homicide they discover is linked to a wesen rite of passage.

Hank and Wu find a solution to stop Renard while Nick is still fleeing. Adalind gets a phone call that throws her into the middle of everything. Monroe's and Rosalee's babysitting adventure turns interesting as they witness Diana's power.