Dr. Scratchansniff takes the Warners to a karate class. The Sensei teaches the trio fighting for a karate competition.
- Yakko, Wakko and Dot Warner (voiced by Rob Paulsen, Jess Harnell and Tress MacNeille, respectively)
- Dr. Otto Scratchansniff (voiced by Rob Paulsen)
- Sensei (voiced by Dan Castellaneta)
- Dora the Explorer (cameo, voiced by Kath Soucie)
- Dora's Backpack (voiced by Tress MacNeille)
- Chinese man (cameo, voiced by Dan Castellaneta)
- Elmyra Duff (mentioned)
- "(to the Warners; after he gives them a backpack he had stolen 2 days ago) Pick it up. Throw it down. Pick it up. Throw it down. Pick it up. Throw it down. Pick it up. Throw it down. Pick it up. Throw it down. Pick it up. Throw it down" - Sensei.
- "What did that teach us, Sensei?" - Yakko Warner.
- "Nothing. I just hate that Dora the Explorer show" - Sensei.
- "Wait just a second! Who did this to my backpack?" - Dora the Explorer.
- "I have such a concussion, I can't remember" - Dora's Backpack.
- "Do you know who did this to Backpack? (blue arrow clicks at Dr. Scratchansniff) Gracias. HYAAAAAAAAAAH! (she attacks Dr. Scratchansniff)" - Dora the Explorer.
- "Aaaaaaaaaaah! Somebody stop that raging Mexican girl!" - Dr. Scratchansniff.
- "Hey! She's beating up Scratchansniff! Aren't we gonna help him?" - Wakko Warner.
- "Nah. If we stop her, Scratchy will frighten us like Elmyra for weeks" - Yakko Warner.
- "I agree with Yakko. Let's not fight Dora instead" - Dot Warner.
- "Okay, then. Let's get out of here" - Wakko Warner.
- "You want some ice cream? I've got an invite for three" - Sensei.
- "Okay" - Yakko, Wakko and Dot Warner.
- "Aaaaaaaaaaah! (raises his fists to the closing iris) Curse you, network censors! (segment ends)" - Dr. Scratchansniff.
- "That's Chinese for Somebody help me! (segment ends)" - Chinese man.
To see a transcript of this segment, click here.
- This segment's title and plot are a spoof of the 1984 film The Karate Kid and its 2010 remake.
- This is one of the few Warner Siblings segments written by the MAD staff.
- The Sensei has a similar voice to Earthworm Jim from the Earthworm Jim cartoon series. His character design is a caricature of actor Steve Zahn.
- The scene where Dr. Scratchansniff says "Curse you, network censors!" was controversially cut in the United States, Canada and the United Kingdom after the original broadcast and replaced by a Chinese man translating Dr. Scratchansniff's screams. The deleted scene was retained in Australian airings.
- The Chinese Man's voice is similar to that of Gil Gunderson from The Simpsons.