• 
  Laura McCreary

  scenarist

• 
  Orlando Brown

  Cornelius Fillmore
• 
  Tara Strong

  Ingrid Third
• 
  Horatio Sanz

  Jr. Commissioner 'Dutch' Vallejo
• 
  Don LaFontaine

  Crainic
• 
  Kyle Sullivan

  Danny O'Farrell
• 
  Wendie Malick

  Principal Folsom
• 
  Lauren Tom

  Karen Tehama

• 
  Debi Derryberry

  Cheri Shotwell
• 
  Mae Whitman

  Robin
• 
  Shanie Calahan

  Biana Bully
• 
  Shaun Fleming

  B.A.G.A.S.T. Wimp
• 
  Lukas Behnken

  Wayne Liggett
• 
  Marcus Toji

  Vern Natoma
• 
  Luke Eberl

  Cuzzy Shotwell

• 
  Josh Peck

  Randall Julian
• 
  Tanya Roberts
• 
  Frankie Muniz

  Augie
• 
  R. Lee Ermey

  colonelul Thrift
• 
  Steve Carell

  dl. Delancey
• 
  Richard Riehle

  Leo Grant (1 episode, 2003)
• 
  Hayden Panettiere

  Yumi (1 episode, 2004)
• 
  Marcus T. Paulk

  Sonny Lombard (1 episode, 2003)
• 
  Kyle Gass

  Mr. Collingwood (2 episodes, 2002-2003)
• 
  Sean Marquette

  Timmy (1 episode, 2003)
• 
  Michelle Horn

  Torri (1 episode, 2003)
• 
  Rachael MacFarlane

  Enid Quintara  (2 episodes, 2002-2004)
• 
  James Gammon

  Doc Hemlock (1 episode, 2003)
• 
  Noel Fisher

  Bri-Dog (1 episode, 2004)
• 
  Jennifer Hale

  Natasha (1 episode, 2003)
• 
  Andrew James Allen

  Rudy Teravall (1 episode, 2003)
• 
  Daveigh Chase

  Joyce Summitt  (2 episodes, 2003)
• 
  Olivia Hack

  Trace (1 episode, 2003)
• 
  Anthony Head

  Professor Third (2 episodes, 2002)
• 
  Holland Taylor

  Mrs. Cornwall (1 episode, 2002)
• 
  John Rhys-Davies

  Lenny (1 episode, 2002)
• 
  Lauren Storm

  Alexis  (1 episode, 2004)
• 
  Vincent Pastore

  Mr. Castenda (1 episode, 2004)
• 
  Thomas Dekker

  James Heron (1 episode, 2003)
• 
  Gary Dourdan

  Ken Fillmore (1 episode, 2002)
• 
  Steven Weber

  Adult Geek  (2 episodes, 2003)
• 
  Caroline Rhea

  Mrs. Konquist (1 episode, 2002)
• 
  Phil LaMarr

  Elderly Man  (2 episodes, 2003)
• 
  Michael Welch

  Cockney Kid  (2 episodes, 2003-2004)
• 
  Chris Marquette

  Horn Leader  (4 episodes, 2003-2004)
• 
  Kurtwood Smith

  Mr. Galser (1 episode, 2002)
• 
  A.J. Trauth

  Chet (1 episode, 2004)
• 
  Rick Logan

  Glee Club Member (1 episode, 2002)
• 
  Raven-Symoné

  Alexandria Quarry  (2 episodes, 2004)
• 
  Jeff Probst

  Vice-Principal Raycliff (unknown episodes)
• 
  Mary Hart

  More! Host (1 episode, 2002)
• 
  Rachel Crane

  Bernice  (3 episodes, 2003)
• 
  Kristin Chenoweth

  Museum Guide (1 episode, 2003)
• 
  Sean Whalen

  Mr Geary  (2 episodes, 2002-2004)
• 
  Adam Wylie

  Geek Brute #1  (2 episodes, 2003)
• 
  Brian George

  Librarian Lendrum (3 episodes, 2002-2003)
• 
  Grey Griffin

  Mrs Waverly  (2 episodes, 2002-2003)
• 
  Samm Levine

  Horace  (3 episodes, 2002-2004)
• 
  Danny Tamberelli

  Joseph Anza