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"Stimpy's Invention" is the 12th episode of Season 1 from The Ren & Stimpy Show. It originally aired as the Season 1 finale on February 23, 1992.


Ask Dr. Stupid

  • Stimpy as Dr. Stupid
  • Announcer
  • Jennifer (mentioned)


Stimpy builds a device that changes Ren's angry behavior altogether, but will it last?


Stimpy Creating The Happy Helmet.gif
Ren happy helmet.png
The Happy Happy Joy Joy song.png
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Ren Destroying Happy Helmet.gif
Destroyed Happy Helmet.png

Stimpy decides to be an inventor and ends up inventing various devices/gadgets. He has a reluctant Ren try out his Cheese-O-Phone, which allows people to talk to cheese, regardless of their foreign tongues. Next, he invents a shaver that allows people to get a close shave without even being there, which leads to him shaving off most of Ren's fur. Before Ren can strangle him, Stimpy presents his friend with a gift. The gift is Stimpy's latest invention, Stay-Put Socks (socks that never fall down). Ren is at first delighted, but then discovers that the socks are filled with glue. Stimpy departs to get the Stay-Put hat and raincoat, while Ren attempts to go after but can't get out of the socks. When Stimpy returns, he immediately notices that Ren is angry. Therefore, he decides to invent something that will make Ren happy all the time. After a long inventing session, he comes up with the Happy Helmet, a helmet to control Ren's happiness. Ren is thrust into a state of completely forced happiness. He begins doing nice things for Stimpy, such as cleaning out his cat box and ironing his underwear. Then, Stimpy brings home a record of his favorite song ("Happy, Happy, Joy Joy" by Stinky Whizzleteats). The two of them begin dancing to the record. In the middle of the dancing, Ren runs into the kitchen and finds a hammer in one of the drawers. He uses the hammer to smash the helmet, then storms back into the living room and begins strangling Stimpy. It's then that he realizes how much he loves being angry and thanks Stimpy for making him enraged. The episode ends with a shot of Ren grinning into the camera while his maniacal laugh plays in the background.

Ask Dr. Stupid

  • From: Jennifer
  • Location: Bent Armpit, Wyoming
  • Question: What is that ugly white slab in my can of beans?
  • Answer: The Queen Bean, and all other beans are the worker beans that serve her.

Production music

  • New World Symphony - Movement 4 – Antonín Dvořák (title card)
  • Dance of the Hours – Amilcare Ponchielli
  • Pageantry Processional – Ronald Hanmer
  • Non Stop – John Malcolm
  • The Nutcracker: Dance of the Sugar Plum Fairy – Pyotr Ilyich Tchaikovsky (stay-put socks)
  • Terror By Night – Hubert Clifford
  • Bits and Pieces – Ronald Hanmer
  • Romantic – Alan Braden
  • Poetic Love Theme B – Mladen Franko
  • Stormy Passage – Cedric King-Palmer
  • Symphony No. 6 Pastorale: 4th Movement – Ludwig Van Beethoven
  • Valse Diable – Alec Gould
  • Tomorrow the World – Cedric King-Palmer
  • Acts of Heroism (c) – Trevor Duncan
  • Heavy Affliction – Cedric King-Palmer
  • Night on Bald Mountain – Modest Mussorgsky (Stimpy putting the Happy Helmet on Ren)
  • Flight of the Bumble Bee – Nikolai Rimsky-Korsakov (Stimpy activating the Happy Helmet)
  • Lambs in Clover – Jack Strachey
  • The March of the Ants – Sidney Crooke
  • Delicate Gay – Alan Braden
  • Happy Outing – Marc Lanjean (Stimpy arriving home)
  • Shopping Spree – Laurie Johnson
  • Happy Happy, Joy Joy! – John Kricfalusi, Chris Reccardi, Charlie Brissette.


This episode has been considered one of the show's most famous, and also one of the best episodes the show has ever made. It was praised for the song "Happy Happy, Joy Joy!", which was a popular hit from the series.


  • This episode is the last for Season 1.
  • This was the last episode made by Carbunkle Cartoons for Season 1.
  • This episode, as well as it's sister episode, "Black Hole", are the only two episodes from the first season that aired in 1992, because this episode had been delayed a few months due to missing a deadline.
  • This episode includes the original "Happy Happy, Joy Joy!" song.
  • There are cute animals and smiley faces painted above Ren's bed in this episode, due to the influence of the Happy Helmet that forced Ren to be happy. Without the Happy Helmet, Ren probably would hate all of this.
    • This is also one of the few episodes where Ren and Stimpy are shown sleeping in separate beds instead of one.
  • If it weren't for "Stimpy's Invention", the whole series of Ren & Stimpy would have just lasted for only one season. But since it became a huge hit among fans, the show was renewed for a second season. 
  • The current reruns shown on Nicktoons in the UK have cut out the scene where Stimpy displays the "Cheese-O-Phone" for unknown reasons. 
    The line "You sick little monkey!" was also used in an episode of South Park.
  • This episode was close to being rejected as Nickelodeon executive believed that the episode would "terrify children", probably due to Ren's creepy smile and his psychotic laughter throughout most of the segment. John K. believed that they'll love the episode and it's story. Ironically, as the executive read the story of the episode, they started to love it, and asked John if he could make another episode that turns out to be a cult hit like "Stimpy's Invention".
  • During the scene where Ren cleans out Stimpy's litter box, some of his crazy laughing was improvised by Billy West, the voice of Stimpy, who would later take over the role of Ren in the show's run.
  • According to the DVD commentary of "Stimpy's Invention", after Ren irons Stimpy's underwear, Stimpy licked the underwear and stuck it on himself. In the final production, he sticks the underwear on him without even licking it.
  • The episode was ranked #78 during's "Top 100 Greatest Moments in Nicktoon History".
  • Ren and Stimpy's dance to "Happy Happy, Joy Joy!" was later used for the SNICK commercial bumper when the show was airing on that line up. The only difference is that Ren and Stimpy are dancing on the SNICK couch instead of under spot lights.
  • The "Happy Happy, Joy Joy!" song was featured as a track in the 1995 album, Saturday Morning: Cartoons' Greatest Hits, a tribute to Saturday morning cartoons (mostly ones from the 1960's and 1970's) hosted by Drew Barrymore. This version of the song was performed by the band Wax. Also, this song was in two Sara Lee commercials around 2006.


  • Like most episodes, Ren's tail keeps disappearing and reappearing. This ends up becoming a running gag in the series.
  • At one point when Ren is on the couch, his right ear is transparent

    Ren without his tail showing

  • In three scenes, Stimpy's nose is red instead of blue.
  • When Ren comes down the stairs to greet Stimpy, he is wearing a bathrobe. In the next scene, when he is coming toward Stimpy and reaching for his neck, the bathrobe is gone.
  • Stimpy tells Ren that the dial on the remote controls how happy he is, yet he presses the dial like a button.
  • During the scene with the stay-put socks, when Stimpy turns to Ren and says "They're full of glue!", his eyes do not move along with the rest of his body
  • When Ren was rubbing the Happy Helmet, when it cut to the jukebox and cut back to Ren, the drawers changed colors.
  • When we cut to a wide shot of Ren asking Stimpy about the Stay Put Socks, in the previous shot, most of his fur had been shaved off, but a shot later, it grew back.
Episode List
Big House Blues (Pilot)
Season 1
Stimpy's Big DayThe Big ShotRobin HöekNurse StimpySpace MadnessThe Boy Who Cried RatFire DogsThe Littlest GiantMaroonedUntamed WorldBlack HoleStimpy's Invention
Season 2
Ren's ToothacheRubber Nipple SalesmenSven HoekHaunted HouseMad Dog HoekIn The ArmyMan's Best FriendBig Baby ScamDog ShowMonkey See, Monkey Don'tPowdered Toast ManFake DadOut WestStimpy's Fan ClubThe Great OutdoorsThe Cat That Laid the Golden HairballSon of StimpyA Visit To AnthonyThe Royal Canadian Kilted Yaksmen
Season 3
To Salve And Salve NotA Yard Too FarCircus MidgetsNo Pants TodayRen's PecsAn Abe DividedStimpy's Cartoon ShowLair Of The LummoxJimminy LummoxBassmastersRen's RetirementJerry the Bellybutton ElfRoad ApplesHard Times for HaggisEat My CookiesRen's Bitter Half
Season 4
Hermit RenThe House of Next TuesdayA Friend in Your Face!Blazing EntrailsLumber JerksPrehistoric StimpyFarm HandsMagical Golden Singing CheesesA Hard Day's LuckI Love ChickenPowdered Toast Man vs. Waffle WomanIt's a Dog's LifeEgg YölkeoDouble HeaderThe Scotsman in SpacePixie KingAloha HöekInsomniac RenMy Shiny FriendCheese Rush DaysWiener BaronsGaloot WranglersSuperstitious StimpyTravelogue
Season 5
Ol' Blue NoseStupid Sidekick UnionSpace DoggedFued For SaleHair of the CatCity HicksStimpy's PetRen's BrainBell HopsDog TagsI Was a Teenage StimpyWho's Stupid Now?School MatesDinner PartySammy and MeBig FlakesTerminal StimpyPen PalsThe Last TemptationReverend JackA Scooter for Yaksmas