During a school museum visit, Kronk's sneezing and Kuzco's dangerous clumsy mischief uncover an ancient inscription. It suggests his family isn't the real dynasty. Worse, that's Guaca's, so he is enthroned, and proves a horrible good pupil of Kuzco's bad example. Yzma hopes to rule trough him or poison him, but fails. The last hope is a prophecy about a lost magical chalice which can reveal the true emperor.