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.

Ozzy goes into mitosis and a four armed evil clone doubles from him trying to steal the iodine.

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 discovers hair growing on his chin; testosterone gang ties up the mayor and wreaks havoc.

Ozzy is still in Christine, using REM sleep (or Random Eye Movement). He calls Drix for help, thats when he learns he's gender morphing. When a cell from a certain gender goes to a body of another gender, that cell becomes that gender. With Drix's plan, and the help of another Drixinol cold pill in Christine called ""Drixina."" Ozzy might come back to Hector, and keep Christine from having pneumonia.

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.

Drix tries to learn how to act ""street"" and ends up helping an acne germ create a huge zit on Hector's face.

Hector eats too much sugar and doesn't brush so he gets a cavity caused by General Malay.

The Mayoral election is coming up, and Spryman's opponent, a nerdy brain cell named Sylvian Fisher, is using a secret growth formula to cause destructive growth spurts and make the Mayor look bad. Ozzy and Drix must stop this fiendish plan, which becomes more difficult when Sylvian takes the growth formula himself and becomes a raging, muscular monster.

Hector's terrible recurring nightmare is keeping everyone in the City of Hector awake. Ozzy and Drix go to the ""Subconscious Network,"" where dreams are produced, and enter Hector's nightmare to help him face his fear.

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

When Hector accidently breathes in lead, the lead gang cause him to make him feel ill. The Mayor then makes Hector eat cereal so he can bring in The Supplements.

Hector's appendix is about to burst.

Ozzy thinks he's going to have a baby, but it turns out he's been infected with an intracellular bacteria by returning villain Strepfinger. Ozzy and Drix must find a way to destroy the parasite growing within Ozzy before it spreads its infection to all of Hector.

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

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.