Professor Crazyhair introduces Penelope, a robot daughter he created to assist him in his lab. When Penelope displays a lack of social skills Lemony decides to teach her how to act like a regular teenage girl. Soon Penelope is shopping at the mall, getting her hair done and throwing temper tantrums. Penelope becomes so much like a real teen that she ends up becoming the most popular girl at school which wouldn't be a problem except that the football team wants her to replace Yakkity as the school's mascot.

Yakkity and Keo leave school to be taught by Keo's father.