- Diedrich Bader
- Â Zee / ... 26 episodes, 2001-2002
- Julie Nathanson
- Â Rosalie Rowan / ... 26 episodes, 2001-2002
- Kurtwood Smith
- Â Agent James Bennet 14 episodes, 2001-2002
- Michael Rosenbaum
- Â Agent West / ... 13 episodes, 2001-2002
- Lauren Tom
- Â Agent Lee 8 episodes, 2001-2002
- Dominique Jennings
- Â Agent Rush 6 episodes, 2002
- Blayn Barbosa
- Â Bucky 5 episodes, 2002
- Grey Griffin
- Â Andrea Donoso / ... 4 episodes, 2001-2002
- Ulysses Cuadra
- Â Bucky 3 episodes, 2001
- Eli Marienthal
- Â Young Zee / ... 3 episodes, 2001-2002
- Stuart Pankin
- Â Dr. Donald Tannor / ... 2 episodes, 2001
- Erika Alexander
- Â Agent Rush 2 episodes, 2001
- Michael Dorn
- Â Colonel Lemak 2 episodes, 2001-2002
- Brandon T. Jackson
- Â Blair / ... 2 episodes, 2001-2002
- Robert Costanzo
- Â Titus Sweete 2 episodes, 2002
- Luray Cooper
- Â Dark Owl / ... 2 episodes, 2002
- John Rubinow
- Â Commander / ... 2 episodes, 2001
- Richard McGonagle
- Â Agent / ... 2 episodes, 2002
- Mark Jonathan Davis
- Â Gate Guard / ... 2 episodes, 2001-2002
- Chad Einbinder
- Â Security Chief / ... 2 episodes, 2002
- Googy Gress
- Â Buss 2 episodes, 2002
- Amy Danles
- Â Meg 2 episodes, 2002
- Marc Worden
- Â Slam 2 episodes, 2001-2002
- Kevin Michael Richardson
- Â Curtis / ... 2 episodes, 2002
- Clancy Brown
- Â Sheriff Morgan 2 episodes, 2001
- Greg Eagles
- Â Old Man 2 episodes, 2001
- Tara Strong
- Â Macy / ... 2 episodes, 2001
- Khrystyne Haje
- Â Tiffany Morgan 2 episodes, 2001
- Chad Lowe
- Â Wade Pennington 1 episode, 2001
- Will Friedle
- Â Future Batman / ... 1 episode, 2001
- John Rhys-Davies
- Â Edgar Mandragora 1 episode, 2002
- Joey Lawrence
- Â Dex Finley 1 episode, 2002
- Richard Libertini
- Â Dr. Myrell 1 episode, 2002
- Adam Baldwin
- Â Swen 1 episode, 2001
- Stacy Keach
- Â Roland de Flores 1 episode, 2001
- Kevin Conroy
- Â Bruce Wayne 1 episode, 2001
- Andrew Lawrence
- Â Carl Finley 1 episode, 2002
- Landry Allbright
- Â Kale 1 episode, 2002
- Nicholas Guest
- Â Jacobs 1 episode, 2002
- Chris Demetral
- Â Bret 1 episode, 2002
- Jeff Doucette
- Â Sheriff 1 episode, 2002
- S. Scott Bullock
- Â Captain 1 episode, 2002
- Dee Bradley Baker
- Â Dante 1 episode, 2001
- Jeff Bennett
- Â Cody Koala 1 episode, 2001
- Sandra Horse
- Â Dr. Willow 1 episode, 2001
- Jeffrey Jones
- Â Detective Marcus 1 episode, 2002
- Dabney Coleman
- Â Dr. Boyle 1 episode, 2002
- Dave Coulier
- Â Delivery Bot 1 episode, 2002
- Robert David Hall
- Â Thad 1 episode, 2002
- Ian James Corlett
- Â Lowe 1 episode, 2002
- Mari Devon
- Â Computer 1 episode, 2002
- Taylor Gifaldi
- Â Amp 1 episode, 2002
- Frank Welker
- Â Dog 1 episode, 2001
- Conchata Ferrell
- Â Dr. Greer 1 episode, 2001
- Miguel Sandoval
- Â Dr. Arroyo 1 episode, 2001
- Keith Szarabajka
- Â Krick 1 episode, 2001
- Hamilton Camp
- Â Dr. Rashad 1 episode, 2001
- Brian Donovan
- Â Rudy 1 episode, 2001
- Hal Linden
- Â Dr. Selig 1 episode, 2002
- Peter Onorati
- Â Blake 1 episode, 2002
- Laurie O'Brien
- Â Paula 1 episode, 2002
- Philip Maurice Hayes
- Â Earl 1 episode, 2002
- Michael Galasso
- Â James Bennet Jr. 1 episode, 2002
- Paul Amendt
- Â Plug 1 episode, 2002
- Ethan Embry
- Â Bodhi 1 episode, 2001
- Jennifer Hale
- Â Gloria 1 episode, 2001
- Tom Wilson
- Â Burly Boyfriend 1 episode, 2001
- Roger Jackson
- Â Richards 1 episode, 2001
- Earl Boen
- Â Event Judge 1 episode, 2001
- Javier Grajeda
- Â Mendes 1 episode, 2001
- Kyle Gibson
- Â Walt Murkin 1 episode, 2001
- Michael McKean
- Â Dr. Marcus Edmund 1 episode, 2002
- Lukas Haas
- Â Casey MacCurdy 1 episode, 2002
- Laraine Newman
- Â Dr. Marion O'Keefe 1 episode, 2002
- Kate Jackson
- Â Bombshell 1 episode, 2002
- Gabrielle Carteris
- Â Female Tour Guide 1 episode, 2002
- Diane Delano
- Â Miss Berkely 1 episode, 2002
- Sean Marquette
- Â Kid Zee 1 episode, 2002
- Alexander Polinsky
- Â Teenage Boy 1 episode, 2002
- Aron Kincaid
- Â Dad 1 episode, 2002
- Jim Wise
- Â Dr. Byrne 1 episode, 2002
- Pepe Serna
- Â Stevedore 1 episode, 2001
- Ambrosia Kelley
- Â Cora Key Walker 1 episode, 2001
- Garland Whitt
- Â Nub 1 episode, 2001
- Lionel Mark Smith
- Â SWAT Captain 1 episode, 2001
- Nikita Hopkins
- Â Kid Rudy 1 episode, 2001
- Steve McGowan
- Â Event Official 1 episode, 2001
- Phil LaMarr
- Â Deputy / ... 1 episode, 2002
- Vanessa Marshall
- Â Virtual Operator 1 episode, 2002
- Erica Hubbard
- Â Lead Bully 1 episode, 2002
- Eliza Schneider
- Â Jenny 1 episode, 2002
- Miles Marsico
- Â Mulie 1 episode, 2002
- David Faustino
- Â Scruffy 1 episode, 2001
- Charles Rocket
- Â Edwards 1 episode, 2001
- Marcelo Tubert
- Â Lorrie 1 episode, 2001
- Roger Rose
- Â Ad-Bot 1 episode, 2001
- Natalie Strom
- Â Kid Gloria 1 episode, 2001
- Wil Wheaton
- Â Kevin 1 episode, 2002
- William Schallert
- Â Judge Linden 1 episode, 2002
- Charles Kimbrough
- Â Pat Jensen 1 episode, 2002
- Larry Cedar
- Â Gate Guard 1 episode, 2002
- Julianne Grossman
- Â Flight Attendant 1 episode, 2002
- Lili Ishida
- Â Becca Dolan 1 episode, 2002
- George Segal
- Â Dr. Eli Selig 1 episode, 2001
- Tim Dang
- Â Captain 1 episode, 2001
- Bianca Taylor
- Â Whitney Walker 1 episode, 2001
- Mae Whitman
- Â Amy 1 episode, 2002
- Gregg Berger
- Â Agent 1 episode, 2002
- Francesca Marie Smith
- Â Transita 1 episode, 2002
- J.R. Yenque
- Â Security Guard 1 episode, 2002
- Michael T. Weiss
- Â Dr. Frederick Wilhelm 1 episode, 2001
- Richard Moll
- Â Krick 1 episode, 2002
- Rodger Bumpass
- Â Sub Captain 1 episode, 2002
- Deborah Taylor
- Â Secretary 1 episode, 2002
- Steven Weber
- Â Eugene Dolan 1 episode, 2002
- Andrea Romano
- Â Adrian Dolan 1 episode, 2002
- Justin Richardson
- Â Reese 1 episode, 2002
- Lisa Edelstein
- Â Gwen 1 episode, 2001
- Cree Summer
- Â Skye Hoaps 1 episode, 2001
- Tom Kenny
- Â Bogg 1 episode, 2001
- Tress MacNeille
- Â Macy's Mom 1 episode, 2001
- Sam McMurray
- Â Larry Lux 1 episode, 2001
- Chris Hardwick
- Â Ro's Brother 1 episode, 2001
- Armando Valdes-Kennedy
- Â Pudge 1 episode, 2001
- David Berry
- Â Michael 1 episode, 2001
- Melanie Chartoff
- Â Lead Scientist 1 episode, 2002
- Neil Ross
- Â Pilot 1 episode, 2002