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"Knock Knock, Who's There?" is a SpongeBob SquarePants episode from season twelve. In this episode, SpongeBob watches Mr. Krabs's house while he's away, so he takes extreme measures to make sure no one breaks in.



The episode beings with Mr. Krabs informing SpongeBob at his house that he is out for the night to the Bikini Bottom Convention Hall and tells him to guard the house while he is gone. While he's gone, SpongeBob checks to see if everything is right in the house. He then orders pizza, but forces the mailman to slide it through the mail slot. Meanwhile at the convention, Mr. Krabs is unqualified to enter because he fails to present any money to the admission. Another fish who brought just a coin is admitted into the convention and is rewarded a giant stash of money, making Mr. Krabs insanely jealous.

At the same time, SpongeBob is watching a scary movie on TV. Mr. Krabs comes home and knocks on the door as he is locked out, frightening SpongeBob with a double-scare. Assuming he's a burglar, SpongeBob refuses to let him in. Mr. Krabs resorts to squeezing through the mail slot, but he's too big. He then climbs up to his top window, but is struck by lightning in the process. He then tries to get in through his bottom window, but is sprayed with perfume as part of one of the booby traps. He attempts to get inside through venturing the sewers and climbs his way up out the toilet, but SpongeBob uses a plunger to flush him back down. Afterwards, he slides through his pet door on the backside of his house, but is crushed by a giant metallic block of cheese.

Mr. Krabs finally resorts to destroying his living room wall with a wrecking ball. As he swings on the ball through the destroyed wall, he slams onto the second wall and gets two black eyes. Just as Mr. Krabs is about to confront SpongeBob and Patrick, he is imprisoned in a giant laundry bin and a block of concrete drops on him, but instantly recovers when SpongeBob and Patrick remove the booby trap. The two then apologizes to him for refusing to let him in and believing him to be a burglar. However, the conflict restarts when they hear another voice from outside attempting to invade the house and believe to be a burglar, who turns out to just be Pearl trying to get back inside.


The episode was confirmed by Vincent Waller on June 29, 2019.[3]


 ) Associated production music
 ) Original music
 ) SpongeBob music

  Ahoy Landlubbers - Michael Bolger and Nicolas Carr [Title card]
  Mister Wobble - Jack Jordan [Opening.]
  Hot Steel and Slide Licks (XIII) - Jeremy Wakefield [?]
  Laughter Muted Trumpet - [ProjectSAM Symphobia Colours: Animator] [?]
  Mister Wobble - Jack Jordan [Mr. Krabs continues to give SpongeBob directions]
  Laughter Muted Trumpet - [ProjectSAM Symphobia Colours: Animator] [?]
  Vibe Sting - Nicolas Carr [?]
  Mister Wobble - Jack Jordan [?]
  Hot Steel and Slide Licks (v) - Jeremy Wakefield [?]
  Melodramatic Moments - Michael Bolger, Nicolas Carr [?]
  Mister Wobble - Jack Jordan [SpongeBob closes the door on Mr. Krabs.]
  Bubble Poppin' Boys - Nicolas Carr, Barry Anthony [SpongeBob checks toilet.]
  Hot Steel and Slide Licks (b) - Jeremy Wakefield [?]
  Mister Wobble - Jack Jordan [SpongeBob remembers what Mr. Krabs said.]
  Tricks and Traps - James McConnel [SpongeBob checks Mr. Krabs' bedroom.]
  Sylvia Celesta - Leo Delibes, Frederic Sans [Mrs. Puff figurine spins.]
  Full of Beans - Robert Schreier [Shot of Midnight Pincer Perfume.]
  Sylvia Celesta - Leo Delibes, Frederic Sans [SpongeBob sprays the perfume on himself.]
  Tricks and Traps - James McConnel [SpongeBob checks paintings.]
  Drama Link (f) - Hubert Clifford [SpongeBob screams.]
  Kalua Jubalee - Sage Guyton, Jeremy Wakefield [Pizza delivery man rings doorbell.]
  Handy Pandy - Cedric Palmer [At the Fast Food Founding Fathers convention.]
  Film Fanfare (a) - Dick Stephen Walter [Fish wins large amount of money.]
  ? [First channel.]
  Acrobats and Clowns (a) - Alfi Kabiljo [Second channel.]
  Unknown Track 69 - Third channel.
  Surf - Dieguis Productions/Big Fish Audio [Fourth channel.]
  ? [Fifth channel.]
  New Threat - Roger Roger [BMGPM] [Fifth channel.]
  Punctuations - Ralph Dollimore [SpongeBob hears a knock.]
  Comedy Punctuations and Bridges 3 - Fredric Bayco [It's Mr. Krabs.]
  Stool Pigeon - Kenny Graham [Mr. Krabs demands in.]
  Alone and Lost - Norman Dane [SpongeBob calls Patrick.]
  Capering Clowns - Max Saunders [Patrick arrives.]
  Nude Sting - Nicolas Carr [Grotesque shot of Patrick.]
  Crime and Danger Sign #2 - Hans Conzelmann, Delle Haensch [SpongeBob and Patrick hear something.]
  Tricks and Traps - James McConnel [Mr. Krabs climbing his house.]
  Crime and Danger Sign #2 - Hans Conzelmann, Delle Haensch [?]
  Comical Clowns - Ronald Hanmer [SpongeBob sets up pillow trap.]
  Crime and Danger Sign #2 - Hans Conzelmann, Delle Haensch [Mr. Krabs trying to reach window.]
  Full of Beans - Robert Schreier [?]
  Crime and Danger Sign #2 - Hans Conzelmann, Delle Haensch [Mr. Krabs' eyes burn.]
  In Disguise Ensemble - [ProjectSAM Symphobia Colours: Animator] [?]
  Lap Steel - Nicolas Carr [Transition to next scene.]
  Fraidy Cat - Fredric Bayco [?]
  Dramatic Cue (d) - Ronald Hanmer [?]
  Vibe Q Sting - Nicolas Carr ["Hmmm?"]
  Eight Dramatic Bridges - Ronald Hanmer [?]
  The Frog Strut - Nicolas Carr, Barry Anthony [?]
  First in Command - Gregor Narholz [?]
  Hot Steel and Slide Licks (v) - Jeremy Wakefield ["Wow, 3D!"]
  Eight Dramatic Bridges - Ronald Hanmer [?]
  Hot Steel and Slide Licks (j) - Jeremy Wakefield [?]
  Ahoy Landlubbers - Michael Bolger and Nicolas Carr [?]
  Punctuations - Ralph Dollimore [Pearl at the door.]
  Sylvia Celesta - Leo Delibes, Frederic Sans [Ending.]



  • Even though this episode will air sometime in 2020 or further, it was made in 2019 according to the credits.
  • When SpongeBob looks at his feet, he makes a face that is a reference to "Just One Bite," when he found out that Squidward likes Krabby Patties.
  • When SpongeBob pulls on a loose string on one of Mr. Krabs' knots, the entirety of his knot collection comes undone, which is a reference to "The String."
  • The live-action mouth SpongeBob makes a return for the first time since "Mermaid Man and Barnacle Boy VI: The Motion Picture."
  • The portrait of the snail that looks like Gary which is hung in SpongeBob's living room appears in Mr. Krabs' house, officially debunking the possibility of the pictured snail being Gary.
  • Mr. Krabs is revealed to own a figurine of Mrs. Puff which is kept in a small blue treasure chest, which dances on a cake.
  • Mr. Krabs is revealed to have a sliding pet door at the back of his house.
  • SpongeBob flips through the channels to see live-action footage of a yellow fish, a coconut tumbling down the hill, a wrestling match between two humans, and a black-and-white horror film involving a fish hook.

Cultural references

  • The title of this episode references the first two exchanges between the teller and recipient of a knock-knock joke.


Knock Knock Who's There (64)

Black shoes error

  • The title card misspells the episode by improperly placing the comma after the first "Knock" instead of the second one.
  • The shoes on the Mrs. Puff figure are incorrectly colored black, when her shoes are actually red.
  • Mr. Krabs' anchor house could not have been that durable for him to be able to smash his claws through, as the exterior is portrayed as being metallic. In addition, since it was raining, he should have slipped off while trying to climb up to his window.
  • After SpongeBob throws the remote, his bucket of popcorn, and his blanket in a frightened response, they are nowhere to be seen in the living room afterward.
  • In "Squeaky Boots," Mr. Krabs' hammock was green, but in this episode, it is blue.

Running gags

  • SpongeBob spraying the bottle of perfume.
  • Mr. Krabs trying to sneak into his own house only to fail and get booby-trapped each time until the end.
  • Someone sliding through the mail slot in the house door.
  • Mr. Krabs falling into a rain puddle.


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