- Doug Hutchison - Elroy-El
- Steven Anderson - Dr. Kanellos
- Dale Dye - Jack Colquitt
- Christian Hoff - Miller
- Richard Kind - Matthew Burke
- Calvin Levels - 1st Mate Potter
- R. Lee Ermey - Sgt. Major Bougas
- Linda Carlson - Theresa Ashford
- Marnie McPhail - Nurse
- Michelle Clunie - Jennifer Brandt
- Marc Worden - Neil West
- J. August Richards - Lt. Thomas
- Iqbal Theba - Gen. Siraj
- Bill Hunter - Secretary General Chartwell
- Randy Stone - Spud
- French Stewart - Survivor
- John Verea - Richard Swirko
- Granville Van Dusen - Gen. Weirick
- Colin Friels - Lt. Col. Fouts
- Nancy Linehan Charles - Adm. Vetter
- Christopher Michael Moore - Sorrel
- Anja Coleby - Bartley
- Tasia Valenza - Kelly Ann Winslow
- Michael Reilly Burke - John Oakes
- David St. James - Adm. Broden
- Will Schaub - Paterno
- Michael Raynor - Lt. Hall
- Belen Greene - Colonel
- Amanda Douge - Kylen
- Christopher Kirby - Kelcher
- Christopher Kirby - Technician
- Christopher Kirby - Lt. Stone
- Alan Dale - Colonial Governor Borman
- Michael Mantell - Howard Sewell
- Alexandra Bokyun Chun - Yuko Kayaguest
- Tony Amendola - Captain Lewelyn
- William Forward - Mercer
- Steve Rankin - Raymond Butts
- George DelHoyo - Nicholas Chaput
- Billy Mayo - Webb
- Randy Mulkey - Donne
- Timothy Dale Agee - Captain Kremens
- Jay Montalvo - Lt. Sullivan
- David Barrera - James Herrick
- Al Garrett - Donovan
- P.J. Ochlan - Eichler
- Bob Clendenin - Mank
- Adam Goldberg - Louie Fox
- Martin Jarvis - Cyril MacKendrick
- David Duchovny - Handsome Alvin
- Coolio - The Bacchus Host
- Janet Gunn - Suzy
- Ronald G. Joseph - Oliver Ranford
- David A.R. White - Ensign Lewis
- James Kiriyama-Lem - Gen. Ming
- Jennifer Balgobin - Lt. Price
- Don Pugsley - Col. Rebborn
- Don Pugsley - Col. Rabborn
- David Jean Thomas - Gen. Alcott
- David Jean Thomas - General Alcott
- Richard Fancy - E. Allen Wayne
- Chris Ellis - Adm. Stenner
- Ashlyn Gere - Feliciti OH
- Billy Maddox - Larkin
- Robert Arevalo - Horn
- Christopher Wiehl - Ensign
- Brian Cousins - Monitor
- David Dean Bottrell - Monitor #2
- Kane Picoy - Lubin
- Heinrich James - Fenris
- Jacquelyn Houston - Hadden
- Ashley Smock - Curran
- Jules Douglas - Ensign
- Edmund L. Shaff - Chaplain
- Rob Elk - Mr. Saber
- David Ramsey - Supervisor
- James Black - Security Operator
- Gunther Jenson - Engineer
- Garon Grigsby - Aerotech Engineer
- Harriet Sansom Harris - Diane Hayden
- Daniel Stewart - Thomson
- Darrin Klimek - Carter
- Tucker Smallwood - Commodore Ross
- Robert Crow - Reynolds
- Robert Crow - Controller
- Glen Morgan
- Howard Grigsby
- James Wong
- Ken Dennis
- Lisa Miller Katz
- Tim McHugh
- Mark R. Crookston
- Shirley Walker
Bill Hunter interpreta a Secretary General Chartwell en la serie.
Harriet Sansom Harris hace el papel de Diane Hayden.
David St. James interpreta a Adm. Broden en la serie.
Alexandra Bokyun Chun interpreta a Yuko Kayaguest en la serie.
Dale Dye interpreta a Jack Colquitt en la serie.
Morgan Weisser hace el papel de Nathan West.
Kristen Cloke interpreta a Shane Vansen en la serie.
Rodney Rowland interpreta a Cooper Hawkes en la serie.
Joel de la Fuente interpreta a Paul Wang en la serie.
Lanei Chapman interpreta a Vanessa Damphousse en la serie.
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