The episode starts with Mr. Krabs closing the Krusty Krab, stating "Thought those deadbeats would never leave." Meanwhile, SpongeBob is in the kitchen and finishes washing the dishes. Mr. Krabs comes in and finds a dirty spot on a plate. He shows this to SpongeBob and states that he can't leave until he gets the spot removed. Mr. Krabs then tells SpongeBob to lock up when he's done. SpongeBob then reminds Mr. Krabs that the last time he was left alone at work, the Krusty Krab was set on fire. Mr. Krabs assures SpongeBob that he removed all welding equipment from the premises, so there is thus no chance of a fire happening again.
Afterwards, SpongeBob tries scrubbing the spot off the plate, but that doesn't work, so he decides to declare war. First, SpongeBob uses a jackhammer, but then falls over and the jackhammer repeatedly smacks him in the face. Secondly, he tries repeatedly banging a bat on the plate, which fails. Thirdly, he uses a chainsaw and repeatedly bangs on the plate, which doesn't work either. Once SpongeBob is out of breath, he gets a tank and shoots a pink sponge on the plate. Since that fails, SpongeBob spits on it, and the spot still doesn't come off and instead slightly increases the size. After this, a determined SpongeBob states "I got to finish this."
SpongeBob soon comes back, dressed in an army outfit and introduces the dirty spot to the Spot-Master 6000. He first shows the spot the microwave-powered laser particle beam. Then, he shows it the laser-guided high-pressure water cannon. Finally, SpongeBob shows the spot a specially woven metal alloy ingeniously combined with state of the art cleaning materials. He calls it "steel wool" and it comes with a laser. SpongeBob asks the spot "Any last words?" After hearing nothing from the plate, SpongeBob starts up Spot-Master 6000 and turns on the particle beam and the water cannon. Since it's not working, he turns on the steel wool laser. While this is happening, the Krusty Krab shakes, lights are shining out of it, and Mr. Krabs can see it from his house while in bed. Mr. Krabs looks through his window, and he doesn't worry because he assumes it has nothing to do with SpongeBob.
Meanwhile, SpongeBob is still trying to get the spot off and then crosses the laser beams. He declares "More power!" While this happens, the Krusty Krab sends out 'sound'-like waves through the air, causing everything to look like it's wiggling. Mr. Krabs checks out of his window again and decides to go see how SpongeBob is doing. When he is near the Krusty Krab, he says "Oh, boy, that can't be good." As Mr. Krabs gets his key out, SpongeBob uses maximum power on the spot. Once Krabs opens the door, a huge blast wrecks the restaurant and a bursting size of an atomic bomb. Once the explosion is over, the restaurant is completely destroyed and then the Spot-Master 6000 disintegrates. SpongeBob looks at the plate and notices the spot finally came off. However, Mr. Krabs no longer cares about the plate since his restaurant is demolished, and angrily chases SpongeBob around the ruins as the episode ends.
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
• You're Nice - Sage Guyton, Jeremy Wakefield [Title card]
‣ The Tip Top Polka/The Cliff Polka - Chelmsford Folk Band [Closing time]
‣ House of Horror - W. Merrick Farran [Krabs sees plate with spot on it]
• Steel Licks 10 - Jeremy Wakefield ["All ready, Mr. Krabs."]
‣ House of Horror - W. Merrick Farran ["Spot! Spot! Spot!"]
‣ Up She Rises - Sam Spence ["...till everything's ship-shape, sir."]
• ? Vibes - Nicolas Carr [Krabs remembers what happened last time]
‣ Drama Link (g) - Hubert Clifford [Flashback to Krusty Krab on fire]
‣ The Marines March - Sam Spence [SpongeBob trying to clean the plate/SpongeBob riding a tank]
• Skipping to School - Sage Guyton, Jeremy Wakefield ["That is the last straw!"]
‣ Licence to Thrill - Robert Cornford [Spotmaster 6000]
‣ War Lords - Robert Cornford [Steel wool]
‣ Project X - King Palmer [Plate gets zapped with lasers/SpongeBob crosses the beams ]
• What's Up - Nicolas Carr [Krabs decides to check on SpongeBob]
‣ Project X - King Palmer [Krabs sees fireworks coming from the Krusty Krab]
• Grass Skirt Chase - Sage Guyton, Jeremy Wakefield [ending]
- This episode is available on the SpongeBob's Pest of the West, Season 5 Volume 2, The Super Celebrations, From the Beginning, Pt.2, SpongeBob SquarePants Vol. 7, The SpongeBob Super Square Collection, The Best 200 Episodes Ever, SpongeBob's Legendary Adventures, The SpongeBob SquarePants 8 Season DVD Collection, The SpongeBob SquarePants Collection, Time Travel, The Ultimate SpongeBob Box Set, Really Big Box Set, SpongeBob's Atlantis SquarePantis (UK version), Complete Fifth Season, and First 100 Episodes DVDs.
- Critic Paul Mavis of the DVD Talk in a review of SpongeBob's Pest of the West, praised the episode for its gags and editing.
- The title card is similar to that of "Pressure."
- This is the second episode to have "The Krusty (blank)" as its title. The first is "The Krusty Sponge."
- Ironically, both episodes are from season 5.
- This is the first episode to play "Skipping to School."
- This is the second time the Krusty Krab is seen on fire. The first time was in "Squid's Day Off."
- Mr. Krabs refers to a blowtorch as "welding equipment."
- A blowtorch is not hot enough to weld.
- The Spot-Master 6000's power source is not revealed in this episode, but since an incredibly huge amount of energy is used and only an atomic bomb can create a blast that huge, the machine could have been nuclear powered.
- This episode premiered during the NEW NEW NEW NEW NEW Week event.
- In real life, mixing microwave radiation and water will just cause a lot of steam.
- The footage of Atomic Bomb explosion shown in this episode was reused from "Dying for Pie," which is an actual underwater explosion on Bikini Atoll, the island near which the series takes place.
- It is later reused in "Frozen Face-Off."
- In the Polish dub, the title is "Czysty talerz" ("The Clean Plate"), which is odd considering that title contradicts the episode's theme.
- When SpongeBob is talking to the plate before he fires the laser, his speech and accent are a reference to the 1962 James Bond movie Dr. No.
- When SpongeBob says, "It may end life as we know it, but I am crossing the beams!," it is a reference to the 1984 movie Ghostbusters, in which it is revealed that crossing the beam of their proton-pack lasers will end life as they know it.
- The plate's spot is below before SpongeBob shoots the pink sponge. Later, it is above.
- When the Spot-Master 6000 starts to turn to ashes, SpongeBob has his helmet on. However, when SpongeBob falls on the ground, the helmet disappears.
- He may have took the helmet off.
- When Mr. Krabs says "Oh, this time, ya done it, boy," part of the floor is missing, but when he's chasing SpongeBob around in circles, the floor is one piece.
- When Mr. Krabs starts chasing SpongeBob, it seems like the foundation of the Krusty Krab is quite small considering the small amount of the space that Mr. Krabs is chasing SpongeBob on.
- ^ Mavis, Paul (2008-04-10). SpongeBob SquarePants - Pest of the West. DVD Talk. Retrieved on 2019-07-15.
- ^ Hrab, Roy (2008-04-25). Review - Spongebob Squarepants: Spongebob's Pest Of The West. DVD Verdict. Archived from the original on 2013-09-21. Retrieved on 2019-07-15.