Gretchen Grundler

Gretchen is an academically talented and extremely intelligent student, known as "Smart Girl" on the playground. A child prodigy, she has shown the ability to do many academic things that other students in her grade find complicated, and even finish a 45-minute test in 10 seconds. She is assisted by a calculator sized hand held machine called a Galileo.

Voice: Amy

Father: Phil Grundler

Mother: Doris Grundler

Friends: TJ Detweiler, Vince LaSSao, Ashley Spinelli, Mikey Blumberg, Gus Griswald, Menlo, Miss Finster, Principal Prickly, Miss Grotke, the Ashleys, Scribe Kid, Jordan and Jerome, King Bob and other good Third Street School students

Enemies: Earwin Lawson, Conrad Mundy, Greg Skeens, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst

Likes: Science, Math, working, studying, space, her friends, homework, reading and coming up with plans

Dislikes: Being called dumb, her friends in danger,  troublemakers causing trouble (mainly Lawson) and being framed by troublemakers