Yzma is the main antagonist in Disney's 40th animated film, The Emperor's New Groove and its television series, The Emperor's New School. She is a hideous old woman who wants to usurp the throne by murdering Emperor Kuzco. She has a strong, but rather stupid henchman named Kronk is Kuzco's primary childhood guardian and advisor.
The Astonishing Kuzco-Man (S02E19) Edit
After getting hit by Yzma’s ray, Kuzco gets superpowers. Yzma then uses the ray on herself to become stronger, and even with growing muscles and destroy Kuzco.