- Peter DeLuise - Dagwood
- Peter DeLuise - Wiggins
- John D'Aquino - Lt. Benjamin Krieg
- John D'Aquino - Ben Krieg
- Luis Guzmán - General Guzmano
- Jonathan Mangum - Covington
- Bernie Casey - Admiral Vanalden
- David McCallum - Frank Cobb
- Brittany Snow - Hyperion Child
- Barry Primus - Frobe Ernst
- Tim DeKay - Lawrence Deon
- Bradford Tatum - Jackson
- Dom DeLuise - Nick Piccolo
- Dawn Robinson - Sarah Toenin
- Turhan Bey - Dimitri Rossovich
- Seth Green - Mark 'Wolfman'
- Dennis Christopher - Ambassador Dillington
- Scott Coffey - Bobby
- JoAnna Garcia - Iris
- Joe Seneca - Professor Bingham
- Rya Kihlstedt - Jessie
- Derek Webster - Corbett
- Mimi Kuzyk - Laura Huxley
- John Bedford Lloyd - The Regulator
- Julia Nickson - Lieutenant Commander Heiko Kimura
- Alan Scarfe - Dr. Rubin Zellar
- Udo Kier - Dr. Guy Peche
- J.A. Preston - Charles
- Yaphet Kotto - Captain Jack Clayton
- John Saint Ryan - Captain Finius Wideman
- Dennis Lipscomb - Tucker
- Kellie Martin - Cleo Walker
- Elizabeth Storm - Claire
- Terence Knox - Commander Michael VanCamp
- Aki Aleong - Army General Tran
- William Shatner - Milos Tezlof
- Sherman Howard - Packard
- Gregory Paul Martin - Marcus Rawlings
- Todd Allen - Clay Marshall
- John Maynard - Hauler Captain
- Lewis Arquette - Kearny
- Dustin Nguyen - Chief William Shan
- Jennifer Landon - Waitress
- Jack McGee - Mike Lutz
- Jason Stuart - Motivational Speaker
- Tim Russ - Martin Clemens
- James Shigeta - Vietnamese President Chi
- Topol - Dr. Rafik Hassan
- Tony Denison - Bobby
- Leslie Bega - Sandra
- Mark Hamill - Tobias LeConte
- Raphael Sbarge - Avatar
- Christopher Pettiet - Zachery Thomas
- Robert Foxworth - Royce Shelton
- Jim Lau - Dr. Wong Fay Hung
- Wanda De Jesus - Commander Pamela Lopez
- Shelley Hack - Capt. Marilyn Stark
- Roscoe Lee Browne - Dr. Raleigh Young
- David DeLuise - Manager
- David Morse - Lenny Sutter
- John Finn - Colonel Schrader
- Holly Gagnier - Rachel
- Charlton Heston - Abalon
- Luca Bercovici - The Marauder
- Sandra Hess - Dr. Karen Sommers
- Sam Sorbo - Mariah
- Alison Moir - Alison
- Charles Cyphers - Calvin Shelley
- Kent McCord - Commander Scott Keller
- Brad Hunt - Le Chein Guard
- Patricia Charbonneau - Elaine Morse
- Michael York - President Alexander Bourne
- Carl Lumbly - Lamm
- Leslie Hope - Marie Piccolo
- Denis Arndt - Navy Quartermaster Bickle
- Jack Blessing - Gaye
- Kurt Smildsin - UEO Guard
- Rob Youngblood - Kaman
- Kristoffer Tabori - Dr. Wolenczak
- Lindsay Frost - Savannah Rossovich
- Dennis Neal - Military Police Guard
- Bryan Friday - Waiter
- Ralph Wilcox - Mason Freeman
- David Marciano - Mack Stumpp
- Felicity Waterman - Mika
- Hank Stratton - Maxwell
- Steven Williams - The President of the USA
- Jonathan Banks - Maximillian Scully
- Michael Parks - George Le Chein
- Michael H. Moss - Lee Colzi
- Monique Mannen - Hostess
- Eric DaRe - Maxwell
- Leo Gordon - Smith
- Jesse Doran - General Thomas
- Sarah Koskoff - Julianna
- William Morgan Sheppard - The Professor
- Rebecca Stanley - Aunt Jenny
- Justine Shapiro - Cmdr. Williams
- Clark Heathcliffe Brolly - Renegade Sensor Chief
- Mark Fauser - Weapons Officer Phillips
- Michelle Holden - Earthcast Anchor
- Brenda Siemer Scheider - Carol Bridger
- Richard Herd - Admiral Noyce
- Richard Herd - Secretary General Noyce
- Buckley Norris - Territorial Governor
- Michelle Sullivan - Crew Member
- Robert Engels - Malcolm Lansdowne
- Sam Armato - Papal Emissary
- Erick Avari - Lybyan Representative
- Patricia Herd - Wife
- Sandra Kinder - Italian Representative
- Vachik Mangassarian - Tunisian Representative
- Gene Ross - Louis Jacobi
- Bruce Klassen - Ensign
- Bruce Klassen - Seaman
- Bruce Klassen - Military Person
- Dan Hildebrand - Helmsman
- Dan Hildebrand - Carlton
- Timothy Omundson - Dr. Joshua Levin
- Jodi Lyn Brockton - Officer Wilson
- Jean Barrett - Williams
- Stephen Kronish - Murray Goldwater
- Rachael Harris - Rose
- William Russ - Rusty Thomas
- Kimble Jemison - Ensign
- George Marshall Ruge - Torrance
- Diana Frank - Mademoiselle
- Leslie Hardy - Beautiful Woman
- Karen Racicot - Teacher
- Tody Bernard - Butch
- Hani Al Naimi - Olden
- Ethan Glazer - Gibby Sutter
- Bari Hochwald - Joan Sutter
- Peter Sands - Cobber
- David Correia - Buck
- Lauren Dennington - Pretty Woman #1
- Renee Parent - Pretty Woman #2
- Una Damon - Sakata
- Karen Fraction - Dr. Perry
- Karen Fraction - Baker
- Tim Kelleher - Commando / Bowman
- Michael Reilly Burke - Commando
- Iilana B'tiste - Commando
- Brent Hinkley - Commando
- Al Rodrigo - Commando
- Philip Tan - Commando
- Sandy McPeak - Grant
- Francis X. McCarthy - Jones
- Jane Rumbaua - Hostess
- Matt Landers - Dinato
- Gustavo Perez - Arab Prince
- Gustavo Perez - Caribbean Native
- Jonathan Nichols - Tom Green
- Anthony Powers - Tom Riley
- Ryan Alosio - Assistant
- Christopher James Miller - Caesar Tetzlof
- Herman Poppe - UEO Officer
- Ksenia Prohaska - Serbian
- Bonnie Bartlett - Secretary General Andrea Dre
- Dave Fennoy - Reporter #1
- Lucy Lin - Reporter #2
- Hannah Sussman - Reporter #3
- Rod Britt - Reporter #4
- Leon Morenzie - General
- Fima Noveck - Confederate Head
- Dian Kobayashi - Head #2
- H.M. Wynant - Head #3
- Paul Napier - Head #4
- Patricia Forte - Head #5
- Dale Swann - UEO Police Officer
- Tony Winters - Color Guard
- Christopher Carroll - Policeman
- Fitz Houston - Policeman #2
- Rick Fitts - Traffic Policeman
- Michael G. Kelley - Brother
- Marianne Hagan - Cynthia Westphalen
- Carlos Carrasco - Colonel Miguel
- Karyn Malchus - Alien
- Karyn Malchus - Lemus
- Brett Rice - UEO Guard
- Brett Rice - Dustin Thaw
- Christopher M. Brown - Obatu
- Lou Cass - Soldier
- Mimi Lieber - Kellogg
- Mimi Lieber - Aunt Rose
- Guillermo Zapata - Policeman
- Patricia Harty - Jordan
- Tom Henschel - Rosenthal
- Neil Giuntoli - Lieutenant Jessup Rienhardt
- Robin O'Dell - UEO Tracker
- Joe Candelora - Trooper
- Thomas R. Martin - Bridger's Son
- Keith Hudson - Tyler
- Donn Lamkin - Waiter
- Jennifer Sky - Shop Girl
- Tom Nowicki - Dr. Slaussen
- Tom Nowicki - Mithor
- Tim Powell - Colony Man
- Marty Stonerock - Woman
- Bill Cordell - Colonist
- Tressa DiFiglia - Ice Cream Vendor
- Lamont Lofton - Suited Sentry
- Bob Wells - Teller
- Steve Purnick - Lab Tech
- Christinna Chauncey - Booa
- Christinna Chauncey - Alien #2
- Mark Lainer - Construction Worker
- Steve Zurk - Security Guard
- Roger Ranney - Hansen
- Jack Swanson - Dr. Dharavi
- Lehua Reid - Lt. Magre
- Elizabeth Fendrick - Mother of Young Girl
- Mikki Scanlon - Sheila
- Jim Vickers - Medic
- Jim Vickers - Looter
- Steve Raulerson - Desk Clerk
- Paul Hungerford - Ferris Wheel Operator
- Russ Wheeler - Jury Foreman
- Parker Whitman - Mike Rainer
- T.E. Russell - Ben
- Tony Sago - Paulie
- Charles Gitonga Maina - Professor Obatu
- David Spielberg - Inspector Donnegan
- Michael A. Nickles - David
- Leesa Castaneda - Desperate Woman
- Leesa Castaneda - Mara
- Jeff Moldovan - Robert
- Elizabeth Rothan - Dispatch
- Elizabeth Rothan - Reporter
- Marc Macaulay - Colonel Manheim
- Tom Celli - General Reed
- Dottie Healy - McGrath's Assistant
- Steve Howard - Enriquez
- Steve Howard - Reporter #2
- Nicolas Surovy - Dr. William Crichton
- Patricia Matthews - Mrs. Crichton
- Dean Cudworth - Guard
- Peggy O'Neal - Anita
- Peggy O'Neal - Dr. Kaufman
- Peggy O'Neal - Dr. Johansen
- Paul Vroom - Lieutenant Commander Trask
- Paul Vroom - Lieutenant
- Pete Penuel - Man
- Timothy Bass - Detective
- Timothy Bass - Cash
- Paul Darby - Doctor
- Gary Bristow - Rick
- Gary Bristow - Lieutenant Abrams
- Tamara Tunie - Laura
- Robert Herrick - Sergeant
- Michael Deeg - Noonan
- Michael Deeg - Trigg
- Leif Riddell - Eddie
- Juan Fernández - Ilich Ramirez Colon
- Marty Connell - Co-Pilot
- Damon Jones - Lieutenant Marrs
- Paul Kiernan - Shepps
- Phillip Martinez - Janitor
- Lou Bedford - Johnson
- Vivienne Sendaydiego - Booth
- Wolfgang S. Zechmayer - Refugee
- Robert Small - Dr. Roberts
- Robert Small - UEO Surgeon General
- Andy Stahl - General Armand Stassi
- Andy Stahl - General Stassi
- Saadia Persad - Hostess
- Avis-Marie Barnes - Female Hauler
- Jim R. Coleman - Tech
- Kristy Eisenberg - Ariel
- Kristy Eisenberg - Escort
- Kristy Eisenberg - Catherine
- Kristy Eisenberg - Hyperion
- Cameron Thor - Dumont
- Kristian Truelsen - Technician
- Hank Stone - Cellmate
- Hank Stone - Marine Sergeant
- Sheri Cook - Young Girl
- Michael Stephen Costello - Secretary General McGath
- Michael Stephen Costello - UEO Secretary General McGath
- Peter Paul DeLeo - Soldier / Guard
- Holly Butler - Bethmay
- Robert Catrini - Chief Customs Agent
- Jack Harrell - Chief Justice
- Eric Miles - McGath's Aide
- Dan Matisa - Tyler
- James Mathers - Verachek
- Candice Critchfield - Supervisor
- Dan Bright - Technician
- Kathy Poling - Ellen VanCamp
- Dorothy Keller - Christine VanCamp (Senior)
- Lee Dawson - Ross
- Chris Edgerly - Ross' Friend
- Nancy Duerr - Session Speaker
- Oscar Corbella - Chilean Representative
- John H. Brennan - Jason Pardee
- Gil Lazier - Professor Kaplan
- James Ritz - Jeremiah
- Traber Burns - Captain John Corey
- Damon Preston - Lost Boy
- Mark Brown - Doorman
- Steven Spielberg
- David J. Burke
Mark Hamill hace el papel de Tobias LeConte.
Kent McCord interpreta a Commander Scott Keller en la serie.
Jonathan Banks hace el papel de Maximillian Scully.
David Morse interpreta a Lenny Sutter en la serie.
William Russ interpreta a Rusty Thomas en la serie.
Patricia Charbonneau hace el papel de Elaine Morse.
Juan Fernández hace el papel de Ilich Ramirez Colon.
Brittany Murphy hace el papel de Christine VanCamp.
Shelley Hack interpreta a Capt. Marilyn Stark en la serie.
Udo Kier hace el papel de Dr. Guy Peche.
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