- Kyle Sullivan - Danny O'Farrell (voice)
- Kyle Sullivan - SPEC Member (voice)
- Kyle Gass - Mr. Collingwood (voice)
- Holland Taylor - Mrs. Cornwall (voice)
- Peter Newman - Eric Orben (voice)
- Hayden Panettiere - Yumi (voice)
- Steven Weber - Tour Guide (voice)
- Thomas Dekker - James Heron (voice)
- Frankie Muniz - Augie Sansome (voice)
- Anthony Stewart Head - Professor Third (voice)
- Michelle Horn - Raylean Tingley (voice)
- Daveigh Chase - Joyce Summitt (voice)
- Shaun Fleming - Proper Kid (voice)
- Shaun Fleming - Theldin Fryburger / Texas (voice)
- Shaun Fleming - Kid / Thug #1 (voice)
- Adam Wylie - Winston Kotter (voice)
- Michael Welch - Philsky (voice)
- Michael Welch - Dimitri / Young Artist / NJ (voice)
- Michael Welch - Tyson Pelarez (voice)
- Mae Whitman - Francine Bishop (voice)
- Mae Whitman - Robin Spencer (voice)
- Mae Whitman - Robin (voice)
- Mae Whitman - Robin / Kid with Saled Bowl Hat (voice)
- Mae Whitman - Robin / Glee Club Girl / Girl #1 (voice)
- Mae Whitman - Robin / Sarah Beale (voice)
- Mae Whitman - Sinead Fionula (voice)
- Christopher Marquette - Jamie Townsend (voice)
- Christopher Marquette - Biker Kid / B.A.G.A.S.T. Member / Tommy / Mike (voice)
- Raven-Symoné - Alexandria Quarry (voice)
- Sean Whalen - Officer Langley Turk (voice)
- Jeff Bennett - Plant Manager / Cowboy / Man #1 (voice)
- Debi Derryberry - Cheri Shotwell (voice)
- Sean Marquette - Linwood (voice)
- Aaron Fors - Student #1 / Thug #2 (voice)
- Ajay Naidu - Sanjay (voice)
- Steve Carell - Mr. Delancey (voice)
- Candi Milo - Receptionist (voice)
- David Berry - Dustin (voice)
- Klee Bragger - Mark Willington (voice)
- Theo Greenly - Warren 'Checkmatey' Foote (voice)
- Marcus Toji - Reporter / JC (voice)
- Phil LaMarr - Elderly Man / Snooty Student (voice)
- Phil LaMarr - Nelson Kelloch / MC (voice)
- Francesca Marie Smith - Penny Madrid (voice)
- Sue Nelson - Overalls Wearing Kid (voice)
- Scott Grimes
- Larry Johnson
Steve Carell interpreta a Mr. Delancey (voice) en la serie.
Ajay Naidu interpreta a Sanjay (voice) en la serie.
Orlando Brown interpreta a Cornelius Fillmore (voice) en la serie.
Tara Strong interpreta a Ingrid Third (voice) en la serie.
Horatio Sanz hace el papel de Horatio Vallejo (voice).
Lauren Tom interpreta a Karen Tehama (voice) en la serie.
Danny Tamberelli interpreta a Joseph Anza (voice) en la serie.
Kyle Sullivan interpreta a Danny O'Farrell (voice) en la serie.
Wendie Malick interpreta a Dawn Folsom (voice) en la serie.
Jeff Probst interpreta a Raycliff (voice) en la serie.
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