- Orlando Brown
- Â Cornelius Fillmore / ... 26 episodes, 2002-2004
- Tara Strong
- Â Ingrid Third / ... 26 episodes, 2002-2004
- Don LaFontaine
- Â Announcer 26 episodes, 2002-2004
- Horatio Sanz
- Â Jr. Commissioner 'Dutch' Vallejo 24 episodes, 2002-2004
- Kyle Sullivan
- Â Danny O'Farrell / ... 24 episodes, 2002-2004
- Lauren Tom
- Â Karen Tehama / ... 19 episodes, 2002-2004
- Wendie Malick
- Â Principal Folsom 17 episodes, 2002-2004
- Danny Tamberelli
- Â Joseph Anza 11 episodes, 2002-2004
- Debi Derryberry
- Â Cheri Shotwell / ... 10 episodes, 2002-2004
- Christopher Rodriguez Marquette
- Â B.A.G.A.S.T. Member / ... 9 episodes, 2002-2004
- Jeff Probst
- Â Vice Principal Raycliff 8 episodes, 2002-2004
- Shaun Fleming
- Â B.A.G.A.S.T. Wimp / ... 8 episodes, 2002-2004
- Mae Whitman
- Â Robin / ... 6 episodes, 2002-2004
- Steven Weber
- Â Manager / ... 5 episodes, 2002-2003
- Klee Bragger
- Â Mark Willington 5 episodes, 2002-2004
- Shanie Calahan
- Â Biana Bully / ... 4 episodes, 2002-2004
- Michael Welch
- Â Cockney Kid / ... 4 episodes, 2003-2004
- Lukas Behnken
- Â Wayne Liggett / ... 4 episodes, 2002-2003
- Kiel Holmes
- Â Alistair Greystone / ... 4 episodes, 2002-2004
- Luke Eberl
- Â Cuzzy Shotwell / ... 3 episodes, 2003
- Thomas Dekker
- Â Biggie / ... 3 episodes, 2003
- Michelle Horn
- Â Claudia / ... 3 episodes, 2003
- Jack Johnson
- Â Grover / ... 3 episodes, 2002-2004
- Sean Marquette
- Â Ham / ... 3 episodes, 2003-2004
- Aaron Fors
- Â Kip / ... 3 episodes, 2003
- Brian George
- Â Librarian Lendrum 3 episodes, 2002-2003
- Samm Levine
- Â Horace / ... 3 episodes, 2002-2004
- Rachel Crane
- Â Bernice / ... 3 episodes, 2003
- Marcus Toji
- Â Vern Natoma / ... 3 episodes, 2003-2004
- Peter Newman
- Â Eric Orben / ... 2 episodes, 2003-2004
- Spencer Klein
- Â George / ... 2 episodes, 2002-2003
- Theo Greenly
- Â Frank Bishop / ... 2 episodes, 2003
- Raven-Symoné
- Â Alexandria Quarry / ... 2 episodes, 2004
- Grey Griffin
- Â Mrs. Lawton / ... 2 episodes, 2002-2003
- Phil LaMarr
- Â Elderly Man / ... 2 episodes, 2003
- Frankie Muniz
- Â Augie / ... 2 episodes, 2002
- Josh Uhler
- Â Nigel / ... 2 episodes, 2002
- Sean Whalen
- Â Mr. Geary / ... 2 episodes, 2002-2004
- Adam Wylie
- Â Geek Brute #1 / ... 2 episodes, 2003
- Kyle Gass
- Â Mr. Collingwood 2 episodes, 2002-2003
- Jeff Bennett
- Â Cowboy / ... 2 episodes, 2003-2004
- Anthony Head
- Â Professor Third 2 episodes, 2002
- Franco Velez
- Â Linus Santiago / ... 2 episodes, 2003
- Daveigh Chase
- Â Joyce Summitt / ... 2 episodes, 2003
- Rachael MacFarlane
- Â Enid Quintara / ... 2 episodes, 2002-2004
- Joey Tyllesen
- Â Ben / ... 2 episodes, 2002-2003
- Peter Augustine
- Â Eric Orben / ... 2 episodes, 2003-2004
- Gary LeRoi Gray
- Â Nick Baker 1 episode, 2003
- Lauren Storm
- Â Alexis Bixbee / ... 1 episode, 2004
- Renee Olstead
- Â Lucille 1 episode, 2003
- Hayden Panettiere
- Â Yumi 1 episode, 2004
- Marley McClean
- Â Lorraine Almaden 1 episode, 2002
- Ogie Banks
- Â Carter 1 episode, 2002
- Marcus T. Paulk
- Â Sonny Lombard 1 episode, 2003
- Jack Salvatore Jr.
- Â Peter Chestnut 1 episode, 2003
- Francesca Marie Smith
- Â Penny Madrid 1 episode, 2003
- Evan Matthew Cohen
- Â Noah 1 episode, 2002
- Richard Riehle
- Â Leo Grant 1 episode, 2003
- Pierce Cravens
- Â Representative Peabody 1 episode, 2003
- Timothy Mittel
- Â TQ 1 episode, 2003
- R. Lee Ermey
- Â Colonel Thrift 1 episode, 2003
- Olivia Hack
- Â Trace 1 episode, 2003
- Andrew James Allen
- Â Rudy Teravall 1 episode, 2003
- Vincent Pastore
- Â Mr. Casteneda 1 episode, 2004
- Emy Coligado
- Â Rochelle 1 episode, 2004
- Josh Peck
- Â Randall Julian 1 episode, 2002
- Mary Hart
- Â More! Host 1 episode, 2002
- Patrick Bristow
- Â Restorer 1 episode, 2003
- Stacie Chan
- Â Junior 1 episode, 2003
- Harley Adams
- Â Wilbur 1 episode, 2004
- Holland Taylor
- Â Mrs. Cornwall 1 episode, 2002
- Kurtwood Smith
- Â Mr. Gaiser 1 episode, 2002
- Kristin Chenoweth
- Â Museum Guide 1 episode, 2003
- Tanya Roberts
- Â Author 1 episode, 2003
- Kathy Kinney
- Â O'Farrell's Mom 1 episode, 2003
- Will Hollis
- Â Dewey 1 episode, 2003
- Ajay Naidu
- Â Sanjay 1 episode, 2004
- Caroline Rhea
- Â Mrs. Konquist 1 episode, 2002
- Sam Gifaldi
- Â Elliot 1 episode, 2002
- Eli Marienthal
- Â Computerized Stingray / ... 1 episode, 2003
- Sue Nelson
- Â Overalls Wearing Kid 1 episode, 2003
- Vanessa M. Elliott
- Â Rita 1 episode, 2003
- Alissa Magrill
- Â Becca 1 episode, 2004
- Steve Carell
- Â Mr. Delancey 1 episode, 2004
- Sparky Mortimer
- Â Chris Minnesota 1 episode, 2003
- James Gammon
- Â Doc Hemlock 1 episode, 2003
- Noel Fisher
- Â Bri-Dog 1 episode, 2004
- Candi Milo
- Â Receptionist 1 episode, 2004
- A.J. Trauth
- Â Chet 1 episode, 2004
- Melissa Tamberelli
- Â Fiona 1 episode, 2004
- John Rhys-Davies
- Â Lenny 1 episode, 2002
- Gary Dourdan
- Â Ken Fillmore 1 episode, 2002
- Holly Robinson Peete
- Â Joelle Fillmore 1 episode, 2002
- Lynsey Bartilson
- Â Malika 1 episode, 2002
- Lauren Schaffel
- Â Tara 1 episode, 2002
- Rick Logan
- Â Glee Club Member 1 episode, 2002
- Nico Matinata
- Â Oscar 1 episode, 2002
- Jennifer Hale
- Â Natasha 1 episode, 2003
- Jason Fuchs
- Â Johnny Nevada 1 episode, 2003
- Adam Conlon
- Â Travis Fox 1 episode, 2003
- Theo Greeley
- Â Warren "Checkmatey" Foote 1 episode, 2003
- David Berry
- Â Dustin 1 episode, 2004