Everything is going right for Yakkity. Is it because of the underpants he has been wearing since last Tuesday?

When the popular game show ""Who Wants to Win a Bunch of Money?"" comes to the town of Onion Falls it seems like the perfect oppurtunity for straight-A student Keo to use his knowledge to win some cash. Unfortunately, Keo is terrified of appearing on television. Keo's best friend, aspiring stand-up comedian Yakkity, dreams of being on TV and becoming famous so the two decide to team-up by having Yakkity go on the show with Keo hiding in his hat. Yakkity becomes a sensation but Keo doesn't like it when people start to think that Yakkity is smarter than he is.

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.

After a football accident leaves Yakkity's antlers bent out of shape Granny tries to get them fixed by getting him antler braces. Yakkity then becomes the most popular guy in town when his braces begin to act as a satellite that picks up all sorts of great television channels.

Yakkity, Keo and Lemony are teamed together on a school project designed to help the town smell better. Lemony completely takes over the project when she decides to make use of some discarded oil by turning into a new lemon-scented fragrance. Lemony is praised and awarded for her unique creation until Yakkity and Keo discover that the oil in the perfume can turn people into human balloons.

When Grandma Yak turns against modern conveniences, Yakkity has to sneak off to the Techno-seum with his science class.

A secret swimming hole becomes an amusement park.