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I'm calling your father!
— Steinbeck to Bowser Junior
Principal Steinbeck is the cruel and insanely evil principal at Bowser Junior's School and the main antagonist of Bowser Junior's Summer School and the Bowser Junior's 1st Grade Series. He has an evil personality and loves when his students get in trouble so he can punish them. An example of this is when he roars at Shrek to get out of his classroom when Shrek asks if he's at culinary cheesecake class. He hates all the SML characters, especially Bowser Junior as seen in Bowser Junior's Summer School, which is shown throughout the Summer School series. Junior hit him once because the fly was near him, and he was so angry that he almost expelled Junior. Junior was defended by Jackie Chu stating that the fly was a task in order to pass the class. He said that Junior got lucky this time and said that they would meet again.

He later returns as a minor antagonist in the Bowser Junior's First Grade series. He replaces Junior's old, original teacher with David Winkle, who later turns out to be a pedophile. He eventually gets Jackie Chu to return as a teacher. When Mr. Winkle returns impersonating Jackie Chu, and Bowser Junior accidentally burns down the school, Steinbeck cuts a deal with Bowser; in order to prevent a lawsuit, Steinbeck promises to pass Bowser Junior as long as he does not sue. He then tells Bowser Junior 2nd Grade won't be as easy, and leaves.

He returns once more in First Day Of School!, when Junior enters Grade 2. His diabolical nature is unchanged, as he tells the students that he hates them and hopes that they will fail and die. He also says that if one of them fails, he will murder all of them.

Likes and Dislikes


  • Punishing and terrorizing students


  • Disrespectful students
  • Pedophiles


  • "Ha ha ha! HA HA HA HA HA HA!!! Have a nice day!"
  • "You got that, guys?! Stein!! Beck!!!" (this is while he writes his name on the blackboard for the students at Summer School).
  • "For all of you failures!"  
  • "It's Steinbeck again!"  
  • "Get out of my classroom, RIGHT NOW!!!!!!" 
  • "Welcome to Summer School, you bunch of failures!"
  • "Hello, this is Principal Steinbeck calling about your son Junior!"
  • "Failing all of his classes!"
  • "On the final exam! With a cucumber!"
  • "We caught your son trying to cheat on an exam today!"
  • "Well, well well. Hello Mr. Steinbeck! Looking delicious. Seen any kids lately?!"
  • "Yes what is it?????"
  • "For what????"
  • "Excellent! I'm calling your father!"
  • "BATHROOM INSPECTION! What do we have here?!"
  • "Man. You do have a class full of idiots."
  • "I don't give a damn about the fly!"
  • "You got lucky; We'll meet again, I PROMISE!" (last words)
  • "Anyone else want to be the class clown?!"
  • "Hehehehehe I'm back."
  • "Hello, failures!"
  • "Welcome back!"
  • "Nothing? Welcome class, WELCOME TO 1ST GRADE!"
  • "Ha Ha Ha! Oh thanks, I get that a lot!"
  • "I don't know what to say!"
  • "Shut the fuck up! Your teacher will be here in a minute."
  • "I just want to say I hate all of you, I hope you die I hope you fail and if you do fail, I will murder every single one of you! Any questions?"


  • He wore a hat in Bowser Junior's 1st Grade! Part 4. He also wore a different suit in First Day Of School!
  • He grunts like a wildebeest.
  • According to some fans, he is similar to The Joker from Batman.
  • In his first two appearances, he has a slight British accent, but in later videos, his accent sounds more American.
  • It is hinted, yet unconfirmed that Principal Steinbeck is Joseph's dad because in Bowser Junior's 1st Grade! Part 1, Joseph says that his mom sleeps with Principal Steinbeck.
  • 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.


Do you like Principal Steinbeck?

The poll was created at 19:46 on October 29, 2014, and so far 589 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 PooChompyThe AlienDr. Fredrick FinkleshitsJacques Pierre FrançoisCrystalHarambeBarack ObamaMr. DinkleThe Alien's WifeTerranceMelvinRobot Chef Pee PeeDoes 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 BillBully Bill's DadPolly The ParrotKidnapperKatyJoseph's DadMr. BonesFeebeeJeff The KillerKiller ClownOther Killer ClownChazJunior JuniorStephen HawkingPee Pee SuckWormyNancy JeffyEaster Bunny GenieRussian SpyAreolaPiggieJimmyGreen Bean GiantPoofAlternate Mama LuigiThe Mighty EagleGreg the PigDewey DonediditPenguin
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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