The Emperor's New School (2006)

S2E7 Show Me the Monkey

Convinced that llama herding is a simple task, Kuzco is challenged by Pacha to try it for a day. Things take a wild turn when the llamas accidentally consume some of Yzma's potions, transforming them into demonic creatures. Meanwhile, Kronk, who also ingested some of the potion, finds himself at Mudka's restaurant but is repeatedly turned away by the staff.