Felicia's HQ is at the toxic waste ordeal again; this time they dump toxic waste and other poisonous barrels onto Mars and Hector's favorite fishing-spot just for the fun of it (that, and they figure the waterfall is a money-saving filter, thus having more wealth for products). While Mars can usually eat dozens of piranhas in one sitting no problem, no matter how much Hector lectures about the eco-system, all it takes is one poison-injected piranha for him to eat himself sick! Blu Print and Ollie Stroy try to take that to their advantage, as Hector guards the dying marsupilami as Aunt Diane makes an herbal remedy for the poison that barely makes it in time.