Dojo, Oh No!: Yin and Yang are in need of a new training device, so Yang joins Ultimoose fighting. Does that mean he will leave Yin? Antagonist: Ultimoose. Finding Hershel: For Woo Foo training, Yo makes Yin and Yang watch a rock named Hershel. After Yang calls Hershel stupid, Hershel turns into a scorpion. Anything Hershel stings turns into a monsters, so Carl the Evil Cockroach wants Hershel to sting him. Yin and Yang must get Hershel back before Carl succeeds in getting stung.