Master Yo tries to explain to Yin and Yang that Ha-Woo-Chris-Foo-Nah-Kah-Mas, a holiday for all Woo Foo Knights, isn't just about getting toys. But Yin and Yang won't listen, and Master Yo buys the toys they wanted. However, the toys are robots made by Zarnot. The robots are designed to make parents mad because one piece of the robot won't fit. Zarnot combines these robot pieces to attack the dojo, and Yin and Yang must stop Zarnot and his new army of robot toys.