"Cat and Mouse"
118-Cat and Mouse between Harmon and Waltz


Episode NumberProduction Code


Episode Information
Air date: April 20, 2012
Viewers: 4.56 million[1]
Written by: Jose Molina
Directed by: Felix Alcala
Opening Quote: Iron Hans
Related Articles
Co-stars: Co-stars
Objects: Grimm Diaries
Film of the White Terror
Images: Images
Transcript: Transcript
Episode Guide
Previous Episode:
"Love Sick"
Next Episode:
"Leave It to Beavers"

"Cat and Mouse" is the eighteenth episode of Season 1 of Grimm and the eighteenth episode overall. It first aired on April 20, 2012, on NBC.

Press ReleaseEdit

NICK MUST CHOOSE SIDES WHEN HIS DUTY AS A GRIMM CONFLICTS WITH HIS DUTY AS A DETECTIVE -- BREE TURNER, SEBASTIAN ROCHE AND NEIL HOPKINS GUEST STAR – While investigating a string of murders, Nick (David Giuntoli) and Hank (Russell Hornsby) learn that their suspect's crime wave began overseas. When Nick discovers the suspect (guest star Neil Hopkins) is being harbored by none other than Monroe (Silas Weir Mitchell) and Rosalee (guest star Bree Turner), he realizes he's hunting the hunted, a freedom fighter trying desperately to escape the clutches of a creature bounty hunter (guest star Sebastian Roche). Bitsie Tulloch, Sasha Roiz and Reggie Lee also star.


Ian Harmon, a leader in the Wesen Resistance, is being pursued across the country by the Verrat, primarily the Hundjäger Edgar Waltz. In a confrontation at a bus station, Ian takes a bullet in the shoulder but survives, leaving behind a duffel bag, which Waltz finds.

Waltz visits Captain Renard's house and requests Renard's assistance, but is turned down. Disappointed, Waltz shares that the High Command has not been pleased that so many of the Resistance have found a safe harbor in Portland. Threateningly, Waltz leaves him with a message in Latin: "If you seek peace, prepare for war." Hank and Nick investigate the shooting at the bus station. The bus driver identifies the passenger getting shot at as Ian and the police are able to make a photo identification.

Rosalee is grabbed by Ian as soon as she enters her spice shop in the morning. Alarmed at first, Rosalee quickly recognizes him. She gets the wounded Ian into bed and calls Monroe for help. After she explains to Monroe Ian's association with the Resistance, Monroe instantly makes the connection that the pursuers must be the Verrat, which worries him: "They make the Spanish Inquisition look like the SPCA."

Waltz Morphed

Waltz killing the bartender

Waltz uses his sources to find a Resistance bartender, a Lausenschlange who "knows things." Pretending to be in need of forged documents, Waltz gets information about a camera shop in downtown with that service. Waltz shoots Quinn for his trouble, leaving Ian's passport behind.

Later, Nick surveys the crime scene at the bar, and Waltz comes forward as a witness identifying Ian as the shooter. Nick sees him change into a Hundjäger and Waltz realizes that Nick is a Grimm.

118-Rosalee and Ian

Ian, after the bullet is removed

As Ian heals up, Rosalee informs Monroe that she and Ian used to be an item years ago when the Blutbad shows distrust. She swears to a jealous Monroe that it is all in the past. Ian is hesitant when Monroe suggests they call in Nick, given his Grimm lineage. Both Wesen, however, testify to Nick's character and Ian begrudgingly agrees.

Renard offers advice when Nick and Hank have no luck on Ian's case.  After they leave, Waltz calls and confirms that he's using the police to help him find Ian and that Nick is a Grimm saying that "there's more to him than meets the eye".



After hanging up on Renard, Waltz goes to the place the bartender gave him. There he puts on a guise before pulling out a gun. Terrified, the shopkeeper woges. Waltz threatens Reginald's family if the latter does not help him find Ian.

Nick arrives at the spice shop, and tries to arrest Ian based on the evidence at the shooting. Rosalee quickly explains the situation to a distrustful Nick, being Ian's alibi during and before the bartender was killed. After Nick is reassured that Ian is unarmed and clean, he finally lowers his gun.

Ian tells them about Edgar Waltz and the rapidly growing Verrat. Monroe adds that the Resistance, the Laufer, is the only thing in the Verrat's way, an organization Rosalee reveals that most of her family were a part of. Ian notes that Grimms decided to fight on the Verrat's side. Nick expresses his apathy to the politics - he just wants Ian out of the country, and is forced to turn a blind eye to them getting fake traveling papers.

Rosalee goes to Reginald with Ian's ID card, telling him that Ian was shot and that he needs papers. Reginald reluctantly takes it, looking nervously at the pictures of his children.

Nick finds a tape of the Verrat in the trailer and watches with horror at how the Verrat had once executed Wesen without trial when their only crime was marrying outside of their own race. Just after the movie, Waltz calls wanting to talk under the terms of a freidenreden about catching Ian Harmon.

Ian acknowledges that Monroe cares for Rosalee, but maintains his distrust in Grimms. Monroe rebuts that they're all equals - isn't that what he's fighting for?

Nick calls then, telling them about the conversation he had with Waltz. Ian explains that freidenreden is a white flag truce with no weapons and no fighting. He also says that Waltz has a high respect for the rules and will honor the truce, but only when Nick is present.

Nick meets Waltz the next day and Waltz admits to the murder of the bartender. Nick says that he will arrest Waltz the second the truce is over, but it turns out that they both have weapons. In the middle of the meeting, Reginald calls and turns Rosalee in. Waltz hangs up and says that if Nick attempts to follow him, he will shoot the first person he sees.

Nick and Hank go to Renard and Nick tells the Captain that the killer called him and admitted to the murder while also threatening innocents. They find the latest call by the number as Reginald's Cameras and head out.

Reginald gives Rosalee the passport and apologizes, covering it up as condolences for her brother's death. As she leaves, Waltz comes out from the back, assuring the safety of Reginald's family. As Waltz starts tracking Rosalee, the police pull up to the camera shop and find Reginald's dead body.

As Rosalee puts together the documents, Waltz comes in pretending to be a customer. She finds a note in the passport package that says "I'm sorry. I had no choice. He is an agent of the Verrat," and is prepared when Waltz puts a gun to her back. She is forced to call Monroe. Waltz takes the phone and says that if he doesn't get Ian in fifteen minutes, he will kill Rosalee.

Monroe calls Nick and tells him about the situation. When they arrive at the shop, they debate over who should go in first. It is decided that Nick should.

Ian harmon1

Ian and Nick pointing their guns at Waltz

Waltz is about to kill Rosalee when Nick enters and pretends to turn Ian in. Monroe then comes in saying he's the one Rosalee called, reassuring the horrified Rosalee of a plan. Nick and Monroe fake an argument. When Waltz asks Rosalee who she called, believing them all to be Fuchsbau, she says that she didn't call one. Monroe woges, stunning Waltz, and attacks.

After a scuffle, Ian shoots Waltz. Nick takes Ian to his car. Before they leave, Nick tells Monroe to get rid of Waltz's body. After Nick drives off, he uncuffs Ian, gives him the documents, telling him not to come back. Ian, believing he was being arrested, stares after the retreating Nick in wonder.

The police find Waltz's body and Renard suggests that someone else might catch up with Ian without them. The episode closes with a clip from earlier of Ian saying that the world is on the brink of war.

Guest StarsEdit


Production NotesEdit



  • The passport shown by the bartender identifies Ian Harmon as a British subject. Real UK passports say British citizen. They also don't list children or infants anymore. The authority is given as simply UKPA rather than the full title.
  • Renard recites the Latin proverb Si vis pacem, para bellum ("If you seek peace, prepare for war"), which was the motto of Deutsche Waffen und Munitionsfabriken, the manufacturer of the bullet Hank finds at the station. The 9mm bullet by DWM was also known as "Parabellum."


  1. Friday Final TV Ratings: ‘Grimm’, ‘Supernatural’ Adjusted Up; ’20/20′ Adjusted Down
Episodes of Grimm

Season 1

"Pilot" • "Bears Will Be Bears" • "Beeware" • "Lonelyhearts" • "Danse Macabre" • "The Three Bad Wolves" • "Let Your Hair Down" • "Game Ogre" • "Of Mouse and Man" • "Organ Grinder" • "Tarantella" • "Last Grimm Standing" • "Three Coins in a Fuchsbau" • "Plumed Serpent" • "Island of Dreams" • "The Thing with Feathers" • "Love Sick" • "Cat and Mouse" • "Leave It to Beavers" • "Happily Ever Aftermath" • "Big Feet" • "Woman in Black"

Season 2

"Bad Teeth" • "The Kiss" • "Bad Moon Rising" • "Quill" • "The Good Shepherd" • "Over My Dead Body" • "The Bottle Imp" • "The Other Side" • "La Llorona" • "The Hour of Death" • "To Protect and Serve Man" • "Season of the Hexenbiest" • "Face Off" • "Natural Born Wesen" • "Mr. Sandman" • "Nameless" • "One Angry Fuchsbau" • "Volcanalis" • "Endangered" • "Kiss of the Muse" • "The Waking Dead" • "Goodnight, Sweet Grimm"

Season 3

"The Ungrateful Dead" • "PTZD" • "A Dish Best Served Cold" • "One Night Stand" • "El Cucuy" • "Stories We Tell Our Young" • "Cold Blooded" • "Twelve Days of Krampus" • "Red Menace" • "Eyes of the Beholder" • "The Good Soldier" • "The Wild Hunt" • "Revelation" • "Mommy Dearest" • "Once We Were Gods" • "The Show Must Go On" • "Synchronicity" • "The Law of Sacrifice" • "Nobody Knows the Trubel I've Seen" • "My Fair Wesen" • "The Inheritance" • "Blond Ambition"

Season 4

"Thanks for the Memories" • "Octopus Head" • "The Last Fight" • "Dyin' on a Prayer" • "Cry Luison" • "Highway of Tears" • "The Grimm Who Stole Christmas" • "Chupacabra" • "Wesenrein" • "Tribunal" • "Death Do Us Part" • "Maréchaussée" • "Trial by Fire" • "Bad Luck" • "Double Date" • "Heartbreaker" • "Hibernaculum" • "Mishipeshu" • "Iron Hans" • "You Don't Know Jack" • "Headache" • "Cry Havoc"

Season 5

"The Grimm Identity" • "Clear and Wesen Danger" • "Lost Boys" • "Maiden Quest" • "The Rat King" • "Wesen Nacht" • "Eve of Destruction" • "A Reptile Dysfunction" • "Star-Crossed" • "Map of the Seven Knights" • "Key Move" • "Into the Schwarzwald" • "Silence of the Slams" • "Lycanthropia" • "Skin Deep" • "The Believer" • "Inugami" • "Good to the Bone" • "The Taming of the Wu" • "Bad Night" • "Set Up" • "The Beginning of the End"

Season 6

"Fugitive" • "Trust Me Knot" • "Oh Captain, My Captain" • "El Cuegle" • "The Seven Year Itch" • "Breakfast in Bed" • "Blind Love" • "The Son Also Rises" • "Tree People" • "Blood Magic" • "Where the Wild Things Were" • "Zerstörer Shrugged" • "The End"