Myles Jeffrey

as T.J. Detweiler (voice)

Pamela Adlon

as Spinelli (voice)

Dabney Coleman

as Principal Prickley (voice)

Ashley Johnson

as Gretchen Grundler (voice)

Allyce Beasley

as Miss Grotke (voice)

Rickey D'Shon Collins

as Vince LaSalle (voice)

Jason Davis

as Mikey Blumberg (voice)

Courtland Mead

as Gus Griswald (voice)

Andrew Lawrence

as Younger T.J. (voice)

Lane Toran

as King Bob (voice)

Klee Bragger

as Digger Sam (voice)

April Winchell

as Miss Finster (voice)

Rachel Crane

as Ashley Q (voice)

Ross Malinger

as Older T.J. (voice)

Danny Cooksey

as (voice)

Jane Curtin

as (voice)

Aria Noelle Curzon

as Cornchip Girl (voice)

E. G. Daily

as Digger #1 (voice)

Miles Marsico

as (voice)

Anndi McAfee

as Ashley A (voice)

Sam McMurray

as Lt. Griswald (voice)

Ryan O'Donohue

as Digger Dave / Randall (voice)

Patricia Renna

as (voice)

Justin Shenkarow

as Gelman (voice)

Michael Shulman

as Francis the Hustler Kid (voice)

Francesca Marie Smith

as Upside-Down Girl / Ashley T / Swinger Girl (voice)

Aaron Spann

as (voice)

Kath Soucie

as Hector / Cindy / Gus's Mom (voice)

Tara Strong

as Spinelli's Doll (voice)

Erik von Detten

as Erwin Lawson (voice)

David Berry

as (voice)