Yin Yang Yo - Finding Hershel

For Woo Foo training, Master Yo makes Yin and Yang watch a rock named Hershel, but after calling Hershel stupid, the latter turns into a scorpion, its sting turning anything into monsters, so Carl the Evil Cockroach wants Hershel to turn him into a monster, and Yin and Yang must get Hershel back.