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Yuck is an evil Level 5 Woo Foo Warrior and a recurring enemy in the TV series Yin Yang Yo!

This entity was formed from Yin's obsession with control and Yang's aggression. As a repulsive, bad-tempered mutant rabbit, Yuck wants nothing more than to become the most powerful Woo Foo Knight ever. The one way he can accomplish this is by eliminating Master Yo and his creators, Yin and Yang. Despite being half female, Yuck predominantly sports male gender characteristics and lacks eyelashes, much like Yin and Yang's combined Aura.


Yuck's first appearance was the episode "Yin Yang Yuck". When Yin and Yang started fighting each other over the best way to attack, they ended up using Woo Foo powers on each other. All of the twins' negative traits were forced out of their bodies, merging together and forming Yuck. While Yang and Yin had become significantly nicer (particularly to each other), it was clear that Yuck was all bad, as he was attacking bystanders at random. When the rabbit twins told Master Yo about their negative traits leaving them, the panda explained that Woo Foo Warriors require all their traits and not just the good ones. At that moment, Yuck showed up and demanded that Master Yo train him to be a Woo Foo Knight. Instead, Master Yo kicked them all out of the dojo. While Yin and Yang simply thanked Master Yo for the training, Yuck angrily vowed that one way or another, he would train to be a Woo Foo Knight.


v - e - d
Yin yang yo logo

Yin Yang Yo! (theme song)


Heroes: Yin | Yang | Master Yo | Chai and Ti | Lina | Dave the Tree Stump | Coop | Katie | Paige | Melodia | Vincent Von Growl | Rainbow Mane | Roger Skelewog Jr. | Jobeaux | The Boogeyman
Villains: Night Master | Flaviour | Dank and Dire | Carl the Evil Cockroach Wizard | Brother Herman the Evil Ant | Lieutenant Charles | Yuck | Kraggler | Ultimoose | Zarnot | Saranoia | Fastidious | Pondscüm | The Blixens | Badfoot | Chung Pow Kitties | Smoke | Mirrors | The Smorks | Ranger Ron | Mastermind | Manotaur | GreedCo CEO | Number Crunchers | The Puffin | Girlbotica | Eradicus | Eradicus' Minions
Others: Muffin | Edna | Jeremy | King Francis | Annie | Samanthuh | Lie Fairy | Roger the Skelewog | Mrs. Skelewog | Tillman | The Lesson | Leprechaun Pete | Terry Otter | Clamuel the Clamboy


Season One: "Dojo Oh No / Finding Hershel" | "600 Channels of Doom / An Oldie but a Goodie" | "Yin Yang Yuck / Beetlemania" | "Enter the Ant / The Sweet Stench of Love" | "Woo Foo Flu / The Imagination Situation" | "Too Much Yangformation / Aura or Not" | "Falling Yin Love / On Golden Pondscum" | "Old School / A Toy's Story" | "The Trouble with Two-ni-corns / Scarf it Up!" | "The Return of the Night Master" | "My Stupid Sword / Neat Freak" | "The High She-as / A Match Not Made in Heaven" | "Scary, Scary, Quite Contrary / How the Cookies Crumble" | "The Yin of Yang / Shopping Sprawl" | "Wubble in Paradise / Dictator of the Year" | "Master Dave / Destination Danger" | "Bad Nanny Jamma / Pros and Cons" | "The Gig is Up / Doomed to Repeat It" | "Family Day / The Hex of the Ex" | "Out on a Pledge / Dojo Alone" | "Attack of the Lesson / A Case of the Evils" | "Attack of the Vidiots / Fit to be Tried" | "Voyage to the Center of the Yo / Sitting Shaggler" | "Shadows and Light / The Truth Hurts" | "Who Knows What Evil Lurks?" | "Night Fall"
Season Two: "Deja Foo" | "The Pecking Order / Party Favors" | "Smoke and Mirrors / Yin-credible!" | "Brain Drain / The Big Payback" | "Imperfect Fooplicates / Messy Relationships" | "A Bad Case of the Buglies / Control Issues" | "Foreign Exchange Problem / Turn About" | "The Manotaur / League of Evil" | "This Yang Isn't Brought to You By... / Stuck" | "Gone-A-Fowl" | "Basic Yin-stinct / Fighting Fooberty" | "Yin, Yang, Carl / Smorks" | "Wonder Tweens Go! / Touchy Feelings" | "O Brother, There Art Thou / Roger... Over and Out" | "An Inconvenient Tooth / Situation Tragedy" | "Skirting the Issue / Moon Over My Yinnie" | "Clown-Fu Fighting / Cat Smash Fever" | "Camp Magic Pants / Worked Stiff" | "Mission Yinpossible / Disapp-Eared" | "Get Off My Back / Slumber Party of Doom" | "Old Softie / Dance, Dance, Devastation" | "Upstanding Yuck / A Walk in the Woods" | "Welcome to the Dark Tomorrow" | "Today You Are a Bear / Pets Peeved" | "For the Love of Clamboy / Zarnot's Girlfriend" | "The Secret Life of Possum Panda / Dummy Up" | "The Howl of the Weenie" | "Game Over / Creeping with the Enemy" | "The Yindianapolis 500 / Personality Problem" | "Season's Beatings / Splitting Hares" | "Extra Cheese, Anchovies and Doom! / The Confidence Game" | "Roboticus Maximus / Size Matters" | "Unmoving Pictures / The Recline and Fall of Civilization" | "Mind Games / The Carl of the Wild" | "Clothes Encounters / Commander-in-Cheat" | "Party Troopers / Shadowcluck" | "Yin Yang You!" | "Division Quest" | "Yin Yang Who?"


Woo Foo Scrolls | Woo Foo Book of History | Amnesulet | Chronologicum | Laladin's Amp | Geosynchronometer | Toilet Brush of Illumination | Prison Prism | Lick-n-Stick

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