Drix's new pet dog, Dander, is mistaken for a Allergen that is threatening the city.

Ozzy, Drix and Maria commandeer a submersible police craft into the intestines to stop a gas build-up that threatens Hector's social situation.

Ozzy must keep Nick O'Teen from getting to the brain where he will cause Hector to smoke.

When Sal Monella, a poisonous gangster germ, kidnaps the Mayor with plans to poison Hector, Ozzy and Drix must come to his rescue.

Hector binges on candy, creating a sugar rush that speeds up all the cells and causes the bacteria population to swell. When his parents cut him off sugar, his drop in blood sugar slows all the cells to a crawl. But the bacteria need sugar, so they form an army to raid Hector's sugar reserves. Now Ozzy and Drix, with the help of the Mole, must take on the bacterial army.

Ozzy accidentally produces a neural spasm that causes Hector to kick the school bully. When the bully threatens to beat up Hector after school, Ozzy has to figure out a way to help Hector defend himself.

Everyone inside Hector forgets who Ozzy and Drix are when Hector experiences a concussion, forcing them to locate the site of the concussion, so they can reboot Hector's memories.

Hector uses a Nose spray to clear his nose, and Drix's Aunt appears. Suddenly, there's a drop in water in Hector and Ozzy thinks Drix's aunt is causing it.

While snowboarding with Travis, Hector crosses an off limits area. Hector starts to freeride, but falls and makes a rip in his trousers. This causes a virus named Cryle to drop Hector's temperature. Ozzy and Drix get ready for a day at the beach, but have to stop Cryle from making Hecotr die of hypothermia.

Hector's appendix is about to burst.