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Chum Caverns is a SpongeBob SquarePants episode from season six. In this episode, Plankton falls into an underground cave and uses its scenery to attract customers.

Chum Caverns

Time cards shown:[]

  • 15 minutes later


October 1, 2009



Plankton discovers that Mr. Krabs hides the Krabby Patty secret Formula under the floor boards, after Mr. Krabs trips over a lose nail, and goes to get it by caving in under ground, however he crashes into a big rock, and when he digs deeper to go around it he gets trapped in an underground cave. Plankton discovers its beautiful and comes up with plan on how he could get more customers, he'll lure them under ground by the gorgeous scenery of the cave. Later that day Mr. Krabs discovers that Plankton has more customers by his cave and decides to go down there to sell Krabby Patties. Plankton is mad about this and decides to get his revenge by trapping Mr. Krabs underground. The two end up fighting trying to get each other trapped under ground. They end up both getting stuck under ground and SpongeBob comes to save them. When he does, Plankton goes above ground again to steal the secret formula, but when he gets above ground he falls back down and so does the Krusty Krab and everyone in Bikini Bottom {C gets trapped, The episode ends with the Cave Dwellers and Plankton as Cashiers.

Major Events[]

  • Plankton manages to get his customers to eat his chum for the second time.
  • SpongeBob eats chum for the second time.
  • Patrick is shown to eat chum for the first time.


  • This episode reveals the name of the light tan little girl fish with light blue lips and a pink skirt—Susie. (The captions make it spelled "Suzy".)
  • Two clips from this episode were on the Deep Sea Danger Zone commercial, but it did not premiere during the week. It was planned to air as the fourth premiere, but was changed to Squid's Visit.
  • This is the second time Karen is seen crying. The first was Single Cell Anniversary but it was different. In that episode, Karen is actually crying, and then shorts out. This, she just says references to crying, such as "Sob, sob, cry, sob."
  • First time Chum Nuggets are heard.
  • This is the last episode before Nickelodeon changes its logo (from an orange blob with white letters to lowercased orange letters that spell NICK).
  • During one part where Mr. Krabs and Plankton are digging underground, it may be a reference to the classic Namco arcade game Dig Dug, when they keep going under each other to make the other one fall.
  • This episode has the same opening theme music as The Splinter.
  • When you watch online and at the end there is a black screen then later the ending credits without music and no words on it and it messes up a bit it might not happen all the time.
  • With everyone trapped underground in the end of the episode, sooner or later they'll notice that they won't be able to pay for the Krabby Patties or run out, thus there won't be nothing left to eat.
  • Another time Bikini Bottom went underground was in That Sinking Feeling.
  • In this episode, the secret recipe is seen hid under a wooden plank floor in Mr.Krab's office,but in episode the Plankton's Army Squidward says "Let me guess, it's at home, under your mattress" , and Mr.Krabs rushes to his house. It is possible that he moved the secret recipe to his office after Squidward revealed where he hid it.
  • In the Chum Caverns, there is no elevator shown going back up.
  • The first time the elevator is shown going down 8 people are enter it from ground level. The second time only six people enter at ground level.
  • In the "15 minutes later" title card, the narrator sobs while saying "15 minutes later".
  • The "Cave Dwellers" in this episode are a play on the Morlock's from the 1960 film, The Time Machine.
  • This is the second time people eat chum thanks to the attraction. The first was in Chum Bucket Supreme.
  • This is one of few times Spongbob enjoys eating chum as in the episode Chum Bucket Supreme, he hates the taste of it.


APM Music

  • Cell 501 - Plankton winds back his long telescope.
  • Brutal B - Plankton starts to drill underground.
  • Big Bad Giant - Plankton gets stuck against a large rock.
  • Munitions Train - Plankton drills underthrough the rock.
  • Voyage of a Lifetime 1 - Panned shot of an underground cave.
  • Cellar Search - "From now on, you shall be my minions; servants to follow my every order! I decree this kingdom to be called the 'Chum Caverns' and may the people of Bikini Bottom shudder in all of its majesty! *laughs evilly*"
  • Tiki Rapido - #1: The customers visit the "Chum Caverns".
  • Mystery X - Plankton takes SpongeBob's money.
  • Tiki Rapido - #2: SpongeBob Patrick visit the "Chum Caverns Gift Shop".
  • Enter The Villain - "KRABS! You can't just slither down here and steal all my customers!! IT'S UNETHICAL!!" / "Unethical? This is all perfectly legit. I call full drilling rights under me restaurant.
  • Slide Whistle Song- Plankton and Mr. Krabs play with their drills.
  • The Great White - Plankton & Mr. Krabs are trapped underground.
  • Epic Tragedy - Plankton & Mr. Krabs cry.
  • Tearjerker - Plankton & Mr. Krabs reconcile.
  • Film Fanfare (a) - SpongeBob rescues Plankton & Mr. Krabs.
  • Sword Fight {Harry Bluestone & Emil Cadkin} - The surface collapses and everyone is trapped underground.
  • Tympup A / ? - Plankton works the register along with his caveman minion.