Cool Summer is the first segment of the twenty-third episode of The Emperor's New School.
Kuzco goes to Machu Beachu with Pacha and Chicha but he fears that the two "old people" will ruin his coolness. Yzma uses a youth potion to make herself an attractive teenager to get near Kuzco and smack him with a hammer. Through a mistake Chicha and Pacha turn into their teenage selves again. When the 18-again couple prove themselves neater than Kuzco, everything changes.
- J.P. Manoux as Kuzco
- Eartha Kitt as Yzma
- Patrick Warburton as Kronk
- John Goodman as Pacha
- Wendie Malick as Chicha
- Shane Baumel as Tipo
- Jessie Flower as Chaca
- Grey DeLisle as Yasmin (Teen Yzma)
- Justin Shenkarow as Teen Pacha