The Onioneers are on winter camp, and Lemony is hoping to win all of the merit medals. But she and Mr. Highpants get stuck on top of Mt. Onion. Now Yakkity, Keo and Wanda must save them.

When Granny Yak moves to a nursing home, Yakkity moves in with her.

A robber is stealing from homes by blowing bubblegum bubbles and floating up to upstairs windows. Trilo is suspected, but is he really the Bubblegum Bandit?

After scoring high grades on a test at school Yakkity, Keo and Penelope are invited to a special camp. Yakkity is excited about going to camp with his friends until he finds out that the camp is actually for smart kids who study science and technology where the activities include programming commands for a giant robot.

The kids decide to work on a movie for the Onion Falls Video Fest but they can't agree on what kind of movie to do so they split up into groups. Yakkity and Lemony decide to work on a comedy about hidden camera pranks while Keo and Penelope work on a sci-fi B-movie about a girl from the future with a warning about a mutant onion.

Yakkity is charged a fine when the library realizes that he hasn't returned a book called ""Darn-it Dog"" which he checked out over 10 years ago. Rather than pay the fine or give back his favorite book, Yakkity lies and claims that he never checked out the book. Eventually Yakkity begins to lie about everything to get what he wants.

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.

Trilo has Yakkity fill in for Wanda at a children's birthday party. When Rondo catches sight of Yakkity, dressed up as Wanda, he instantly falls for for the yak and invites him to a party as his date.

Keo and Yakkity find work in a video shop. Yakkity recommends all of Jackie Pachyderm's funny films, except for A-Pach-Alypse Now.

Granny Yak is having surgery done on her antlers and Keo has Pineapple Pox, so Yakkity has a sleepover at Lemony's place. There he discovers some embarrassing secrets about Lemony's brother Rondo. When he reveals all at school, Yakkity unintentionally assumes the position of the school bully. This soon causes everything to be out of whack.

Things go wild in Onion Falls after Yakkity receives the Jackie Pachyderm Practical Joke box, but someone else knows a few good practical jokes.

Keo is embarrassed by his old bike, but his father won't let him spend his film school money on a new one. With poor finances, will the family have to move to freezing Bergville?

Yakkity keeps putting off study for a biology test due the next day. However, an educational animation video featuring Alan Amoeba helps teach Yakkity about cellular replication.