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"Shut the f*** up! Your teacher will be here in a minute!"
— Steinbeck to Cody.

Principal Steinbeck is the cruel and somewhat insane principal of Bowser Junior's school. He loves it when the students get into trouble, so he can punish them. It is unknown why Principal Steinbeck is evil and how he became that way. He is very abusive and mean towards the students, but he appears to be nice and smooth-talking towards other adults, including the teachers.

In "Bowser Junior's First Grade Part 4" Principal Steinbeck has a conference meeting with the students and their parents. He says that they goofed up after enrolling Mr. Winkle as the new teacher. Bowser gets angry with him and asks why they didn't know he was a pedophile and thinks they didn't do enough backround checks. Principal Steinbeck responds by saying that they tried everything, but has Officer Goodman explain the rest. As Goodman says that Mr. Winkle called him "hot" Principal Steinbeck remarks that he called him "hot" too and started to bicker angrily. After Joseph's Mom reveals they need more "Windex" Joseph remarks that that's not what was going on. Steinbeck laughs evilly and says that the next replacement teacher will be perfect.

In the Part 5 of the 1st Grade series, Bowser Junior answers the door to their apartment and sees Principal Steinbeck. He explains that he needs to see Bowser. So, Junior goes to Bowser's room and tells him that Steinbeck needed to see him. Then, Principal Steinbeck tells Bowser that they'll let Junior pass 1st grade and says that 2nd grade won't be easy.

He returns once more in First Day Of School, where Principal Steinbeck barges into the classroom and tells the students that if they fail, he'll punish them in the worst way possible. Cody asks when the teacher would arrive, but Steinbeck tells him to shut up. Afterwards, he leaves the classroom.

Likes and Dislikes


  • Students failing classes
  • Punishing and terrorizing students
  • Jackie Chu



  1. He wore a hat in Bowser Junior's 1st Grade! Part 4. He also wore a different suit in First Day Of School!
  2. According to some fans, he is similar to The Joker from Batman.
  3. He is somewhat similar to Mr. Krupp from the Captain Underpants book series.
  4. In his first two appearances, he has a slight British accent, but in later videos, his accent sounds more American.
  5. Despite his insane and abusive disposition, Steinbeck is not completely evil, as he shows an intense dislike for pedophiles, and calls the police when he thought Junior was being harassed by one.
  6. He is believed by fans to be Charleyyy in disguise.


Do you like Principal Steinbeck?

The poll was created at 19:46 on October 29, 2014, and so far 730 people voted.
Main characters MarioBowserBlack YoshiChef Pee PeeBowser JuniorJosephCodyShrekRosalinaJeffyBrooklyn T. Guy
Recurring characters GoodmanCharleyyyJackie ChuMargaretDoofy The DragonCraig The DevilScrewballTyrone CalvinJudy
Minor characters ToadTony The TigerWoodyLuigiMr. PigPeachThomasKenPatrickPink YoshiPrincipal SteinbeckHarold WilfredJudyDonkey KongDiddy KongHanselKirbyChris the CucumberFelipeThe RatEmily ColemanLinkSamanthaWarioWaluigiSimmonsBrooklyn Guy's WifeTyreeseTom BradyMr. WinkleCarlosCandyCandy's FatherMickey MouseRay CheesyD-Money JuniorJackie TwuMine! BirdBaby MarioLoan DolphinSonicChef Poo PooChompyBully BillThe AlienDr. Fredrick FinkleshitsJacques Pierre FrançoisCrystalHarambeBarack ObamaMr. DinkleThe Alien's WifeTerranceMelvinDoes Bad Things GuyGumboDrawing Jeffy
One time characters Chef LuigiThe CrocodileElectrician's SonJoseph's GirlfriendHarleyyyRemyRussell WilsonSheila PerkinsPopeyeD-Money SeniorThe Cat In The HatWhite YoshiDoofy's Ex-WifeBirdoBully Bill's DadPolly The ParrotKidnapperKatyJoseph's DadMr. BonesFeebeeJeff The KillerKiller ClownOther Killer ClownChazJunior JuniorStephen HawkingPee Pee SuckWormyNancy JeffyEaster Bunny GenieRussian SpyPiggieJimmyGreen Bean GiantPoofAlternate Mama LuigiThe Mighty EagleGreg the PigDewey DonediditCatherine Catfish
Forgotten characters Big RedKung PowBaby PeachThe RatTyreeseTaco Bell ChihuahuaMama LuigiSpeedyPimpster GoombaSkittlesShrek JuniorTalibanBlueTony (Bird)ChadKing PigRay the pigHelmet PigYoshiCeciliaKing StrongbottomTannerKoopa TroopaAtso
Cast Logan ThirtyacreLovell StantonLance ThirtyacrePablo SanchezChilly JimenezElaina KeyesTito JimenezJulian JimenezDonald Rodriguez
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