When the Elements hide in a dense forest, General Bu is desperate for ideas on how to catch them. An apothecary, White Snake, gives Bu a serum to make him smarter, and he comes up with the idea of poisoning the forest to give the Elements no place to hide. But the poison not only makes the forest sick, but also Shao Yen, the Wood Element. The Elements have to find an antidote before it's too late.