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 the Bikini Bottomies gets trapped, The episode ends with the Cave Dwellers and Plankton as Cashiers.
( ‣ ) Associated production music
( • ) Original music
( ◦ ) SpongeBob music
•SpongeBob Theme - Jeremy Wakefield, Sage Guyton [title card] • ? - Michael Bolger, Nicolas Carr ["Looky, another bright-eyed, bushy-tailed customer!"] • ? - Nicolas Carr [secret formula hidden under Krabs' floor] ‣Zelle 501 - Gerhard Trede ["Did you see that?"] ‣Zelle 503 - Gerhard Trede [Plankton drilling underground] ‣Big Bad Giant - Paddy Kingsland [drill hits a rock] ‣Munitions Train - Harry Bluestone [Plankton tunneling under the rock] • ? - Jeremy Wakefield [they fall into an underground cave] ‣Voyage of a Lifetime 1 - John Fox [pan of cave] ‣ ? [Karen gets an idea] •Horror House of Wax Retro 2 - Nicolas Carr, Ron Wasserman [cave dwellers] ‣Cellar Search - Philippe Pares ["From now on, you shall be my minions."] ‣Tiki Rapido - Lionel Wendling [cave turned into a restaurant] ‣Kommissar X - Gerhard Trede [cash register full of money] • ? - Jeremy Wakefield ["I'm running out of space for this stuff."] • ? - Sage Guyton, Jeremy Wakefield [Patrick eating chum] ‣ ? ["You come down here to admire the subterranean splendor of the chum caverns."] ‣Tiki Rapido - Lionel Wendling [gift shop] • ? - Jeremy Wakefield [SpongeBob goes back to the Krusty Krab] • ? - Michael Bolger, Nicolas Carr ["Where have you been?"] ‣Battle March Link (f) - Keith Mansfield ["Krabs? What are you doing here?"] • ? - Michael Bolger, Nicolas Carr [SpongeBob selling Krabby Patties] ‣Enter the Villain - Chris Payne, Paul Rogers ["You can't just slither down here and steal all my customers!"] •Vibe Sting - Nicolas Carr ["Sea turtles, he called it!"] •Slide Whistle Song - Nicolas Carr, Sage Guyton, Jeremy Wakefield [Plankton, Krabs tunneling under each other] ‣The Great White - Gregor F. Narholz [Plankton and Krabs trapped underground] ‣ ? [Plankton tries to escape] ‣Epic Tragedy - Gerhard Trede [Plankton and Krabs crying] ‣Tearjerker - Harry Bluestone, Emil Cadkin ["Let's agree to work together."] ‣ ? ["Hang on a minute."] ‣Film Fanfare (a) - Dick Stephen Walter [SpongeBob rescues them] •Vibe Sting - Nicolas Carr ["Where'd he go?"] • ? - Sage Guyton, Jeremy Wakefield [Plankton trying to steal the formula] ‣Sword Fight - Harry Bluestone, Emil Cadkin [everyone gets trapped underground] • ? - Michael Bolger, Nicolas Carr ["Satisfied with yourself, Plankton?"] ‣Tympup A - Sammy Burdson, John Charles Fiddy [ending] • ? - Nicolas Carr [ending]
October 1, 2009
15 Minutes Later...
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."
This is the last episode before Nickelodeon changes its logo. (from an orange blob with white letters to lowercased orange letters that spell NICK).
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.
In this episode, the secret recipe is seen hid under a wooden plank floor in Mr. Krabs' office, but in the episode 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.
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 SpongeBob enjoys eating chum as in the episode Chum Bucket Supreme, he hates the taste of it.
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.
In the Chum Caverns, there is no elevator shown going back up.
The first time the elevator is shown going down, eight people are enter it from ground level. The second time, only six people enter at ground level.
Plankton was on the surface at the end, but when the Krusty Krab fell underground, he was inside the Krusty Krab.
When Plankton first begun to dig the drilling tool was on a wire. In the next scene, it was attatched to the vehicle. His vehicle was destroyed when he reached the Caverns. Then later in the episode it reappears, when Plankton was digging under Mr. Krabs.