Squidward is working at the Krusty Krab, and SpongeBob accidentally karate chops him. Squidward asks what he was doing and SpongeBob tells him that he is planning to do karate with Sandy, which Squidward thinks is stupid. That night, Squidward is grocery shopping, and is approached by a large thug (The Creepy Creeper). Squidward assumes he is going to steal his groceries, so he runs to SpongeBob, and asks to be taught karate. SpongeBob then tries to teach him but because he's not very good at it himself, he is unable to teach Squidward.
They then go to Sandy for help. First, she makes Squidward promise not to use it for revenge and use it only for protection. Then, she and SpongeBob try to teach him, but can't. Sandy then decides to quit on him, but Squidward says he'd do anything. So Sandy makes him do all the work around the treedome saying that it will teach him the basic movements. Finally Squidward decides to quit, however he accidentally flings acorns at himself that he was able to dodge. He then found out that in doing all the work, he actually did learn it.
So then, Sandy presents him his belt, but Squidward claims that he has "important business" to attend. He then finds the thug, and uses karate to beat him up (with a lot of the moves being related to the housework he did around the treedome).
However, it turns out that he never wanted to steal his groceries, he wanted to return them. SpongeBob and Sandy then came giving Squidward his belt only to find out that he used karate for vengeance. Sandy says that Squidward wasn't deserving of his belt and she and SpongeBob walk away because Squidward dishonored their trust in him. Squidward is then arrested for assaulting the thug.
( ‣ ) Associated production music
( • ) Original music
( ◦ ) SpongeBob music
•Hawaiian Trax - Sage Guyton, Jeremy Wakefield [title card] • ? - Jeremy Wakefield [Squidward lying on the floor] •Exotic Sting - Nicolas Carr ["I'm just practicing my karate chops."] ‣Creepy Sting 1 - ? ["You never know what kind of creepy creeper could be creeping creepily around any creepy corner."] •Vibe Q Sting - Nicolas Carr ["Well..."] ‣Cartoon Sting 2 - Gerhard Narholz, Nicolas Carr, Barry Anthony [Squidward leaves work] ‣Disastrous Event 2 - Harry Lubin ["Hello? Is somebody there?"] ‣Charivari Clowns - Daniel Janin [SpongeBob and Gary watching TV] ‣Scary Search - Harry Lubin ["SpongeBob, open up!"] ‣ ? ["Teach me the way of tarake!"] • ? - Jeremy Wakefield [SpongeBob torn in half] ‣ ? ["I don't know, SpongeBob."] ‣Cartoon Sting 15 - Gerhard Narholz, Barry Anthony [Sandy says karate isn't for revenge] ‣ ? [Squidward promises to use karate only for protection] ‣ ? [Squidward's karate training] ‣Cartoon Sting 7 - Gerhard Narholz [Squidward describes his attacker] •Vibe Sting - Nicolas Carr ["Hmm..."] ‣ ? [SpongeBob wearing a mask] • ? - Jeremy Wakefield ["Got you right where I want you!"] ‣ ? ["Vengeance?"] • ? - Jeremy Wakefield ["This is pointless."] ‣ ? [Squidward says he'll do anything] ‣ ? [Sandy holds up a mop] ‣ ? [Squidward mopping and vacuuming] ‣ ? [Squidward burying acorns] • ? - Jeremy Wakefield ["That's it! I am outta here!"] ‣ ? ["Hey, I'm doing it!"] •Exotic Sting - Nicolas Carr ["Yee-haw!"] ‣ ? ["I can protect my groceries now!"] ‣ ? [belt of basic competence] ‣Evil Horror - Harry Lubin [huge guy approaches Squidward] ‣ ? [Squidward attacks him] • ? - Jeremy Wakefield [huge guy gives Squidward his groceries back] ‣Cloak and Dagger [#69] - Phillip Green ["This guy's been karated!"] ‣Cloak and Dagger [#70] - Phillip Green ["For shame, Squidward!"] ‣Steel Licks (b) - Jeremy Wakefield ["Thanks for dishonoring our trust in you."] •The Mob - Nicolas Carr [ending]
This is the second episode where a character (other than SpongeBob or Sandy) learns karate, the first being Patrick in "Karate Star." These two episodes coincidentally share similar title cards
This is one of the episodes where SpongeBob is shown to be no good at karate, like in "Karate Island," but there are also episodes where he is shown to be quite good at it, like in "Karate Choppers."
SpongeBob states that he has only be taking karate from Sandy for two years. If he met her in 1999, that means this takes place in 2001.
On Hulu, the SpongeBob promo is the scene where SpongeBob and Gary are laughing on the couch, except without sound and it is vertically flipped.
This episode's title is a spoof of "Self Defense".
When SpongeBob says "Creepy Creepers", this might have been a reference to the Creepers in the popular sandbox game, Minecraft.
When SpongeBob and Sandy first met in "Tea at the Treedome", it was revealed that both of them knew karate before they met each other. In this episode, SpongeBob tells Squidward that Sandy taught him karate, which obviously couldn't have happened before they met. Also, SpongeBob is not very skilled in this episode, when he is in episodes such as "Karate Choppers".
When Squidward first bangs on SpongeBob's door and the scene changes over to SpongeBob and Gary, they were sitting on the couch. After SpongeBob lets Squidward into his house and was spooked by Gary, the couch was missing and Gary was suddenly on the floor.
When Squidward watered Sandy's lawn, Sandy was missing her tail.
Sandy was darker than usual in the night scene.
The toilets are in the wrong place they appear on the left side of the restroom area instead of on the back.