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Billy Dilley
Voiced by: Aaron Springer
The main character. A science-loving kid who builds a machine that drills holes in cheese that malfunctions, leaving him along with Zeke and Marsha stuck in the center of the Earth.
- Absent-Minded Professor
- Character Catchphrase: "Fascinating!"
- Cloud Cuckoolander: Oh boy.
- Ditzy Genius
- Redheaded Hero: Is the main protagonist and sports a puffy orange afro.
- White Gloves: Billy sports a pair.
Zeke
Voiced by: Tom Kenny
A long-haired, preteened slacker who was assigned to work with Billy. He often tries to appear cool and aloof, but in reality gets emotional quite easily.
Marsha
Voiced by: Catherine Wayne
A wannabe social butterfly and budding journalist who was assigned to work with Billy. Very impressionable and lively, if somewhat spacey at times.
Anaximander
Billy's pet rat who spends much of the episodes lazing around.
- Half-Dressed Cartoon Animal: Wears only a white tank top and green sandals.
- Lazy Bum
- The Stoic: He doesn't really react much to what goes on in the show. A flashback in "Rat's Entertainment!" reveals that he's Seen It All.
- Team Pet
- Your Size May Vary: He can vary from being the size of a normal mouse to half the size of Billy depending on the scene.
Count Wretcher
Voiced by: James Arnold Taylor
The self-proclaimed ruler of Subterranea-Tania, who dreams of covering the surface world with sludge.
- Aristocrats Are Evil
- Big Bad: He at least tries to be this, but his schemes are so ill-fated that he doesn't pose a very serious threat.
- Bully Turned Buddy: After playing a villainous role for most of the series, he attends the protagonists' party in a very friendly and sociable spirit in the finale.
- Genre Savvy: He very quickly recognizes Billy as a Ditzy Genius and a Nice Guy, enabling him to take advantage of Billy's intellect and trusting nature. Likewise, when Zeke and Marsha show up, he instantly recognizes them as the wiser foils to Billy and he keeps them distracted.
- Go-Karting with Bowser: Despite attempting to steal Billy's Cheeserator for his nefarious schemes, he happily joins in the heroes' party in the last episode.
- Green and Mean
- Ineffectual Sympathetic Villain: His mother bosses him around in his personal life, and he is both bumbling and unlucky in his villainous schemes.
- Kick the Dog: He enjoys bullying and belittling his diminutive lackey, Thurston.
- My Beloved Smother: His mother is very overbearing.
Judy
