Jack recruits Katnappé, confident that she will be the one to finally take down the Xiaolin Warriors. Using the Golden Tiger Claws, Katnappé goes untouched against her foes and constantly outsmarts them. However, she also misuses them by pilfering from numerous places for her own pleasure. Omi and the rest start to get frustrated, and begin to stragetize on how they'll be able to stop this "cat burglar".

Master Fung tells the Warriors that one of them will soon advance to Wudai Warrior level, and each one is convinced that it is them. A new Shen-Gong-Wu is revealed, the Ying Yo-Yo, which acts as a portal to the Ying-Yang world. After losing the Wu, the Warriors learn that Master Fung has been taken and transported to the Ying-Yang world, but they cannot rescue him without the Ying Yo-Yo. Omi goes to Chase Young for help, who agrees to assist him. After finding the Yo-Yo, Omi enters the Ying-Yang world and rescues Master Fung, but upon leaving, Omi's good chi stays while his bad chi begins to take over . . .