Teenage Mutant Ninja Turtles S04E08 - Rondo in New York

J. Gordon Hungerdunger, a Texas millionaire, is holding a "best super-hero" contest. The winner of the contest will receive the humongous Malaprop Diamond. No one is aware of it, but Hungerdunger is using the contest as a diversion so that he can put a zombie-making chemical into the city's water supply. The malevolent millionaire figures that if he can get the citizens under his control, he can easily take over the city.