- Tim Thomerson - Senator McQuate
- Alison Lohman - Claire
- Michael Beck - Mr. Jones
- John Novak - Dr. Alain Lebecque
- Sophie Ward - Isabelle
- John Saint Ryan - Technomage
- John Vickery - Mr. Welles
- Tim Choate - Polix
- Brian Thompson - Robert Black
- Tom Wyner - Apriori Flentak
- Madison Mason - General Miller
- Richard Biggs - Dr. Stephen Franklin
- Josh Clark - Kendarr
- Edward Woodward - Alwyn
- Will Schaub - Jenson
- Jamie Rose - Cynthia Allen
- Lance LeGault - Senator Jacob Redway
- Peter De Anda - General Thompson
- Gary Graham - Bruder
- Juanita Jennings - Lieutenant Carr
- Wayne Wilderson - Kevin Sprach
- Curt Lowens - Old One
- Sal Landi - Rolf Müller
- Mark Blankfield - Jenson
- Nancy Linehan Charles - Villager
- Timothy Landfield - Lorkan
- Matt O'Toole - Man
- Patrick St. Esprit - Captain Ross
- Rex Ryon - First Man
- Zeus Mendoza - Trace Miller
- Christopher Comes - Aide
- Don Fischer - Captain Henson
- Brook Susan Parker - Lieutenant Ross
- John Sanderford - Mr. Ames
- Scott Paetty - Lieutenant Meyers
- Mik Scriba - Barkeep
- Marshall R. Teague - Captain Daniels
- Michael O'Connell - Worker
- Sophia Santi - Worker
- Joe Wandell - Communications Officer
- Dawn Stern - Alison
- Daniel Guzman - XO
- Kevyn Major Howard - Officer
- Sharisse Baker-Bernard - IPX Official
- Eric Ware - Tim
- Jason Rodriguez - Rivera
- Harley Zumbrum - Bruiser
- Mark Hendrickson - Drakh Captain
- Mark Hendrickson - Patron
- Stephen Austin-Skordiles - Pak'ma'ra
- Joel Swetow - Ris
- Jonathan Chapman - Brakiri Ambassador
- Kathe Weeks - Diane
- LuAnne Ponce - Janey
- Christopher Michael - Earthforce Captain
- Brenan T. Baird - Kulan
- Adam Clark - Ranger
- Roxana Brusso - Crew Member
- Susie Park - Sogayu
- James Parks - Duncan
- Ron Campbell - Belan
- Maggie Egan - Jane - ISN Anchor
- Carl Reggiardo - Drakh
- Carl Reggiardo - Drazi Vendor
- Tony Amendola - Natchok Var
- Bill Mondy - Nix
- Peter Welkin - Trulann
- Françoise Robertson - Lyssa
- Harry Van Gorkum - Durkani
- Robert Caso - Maintenance
- Eric Whitmore - Security
- Camila Griggs - Security
- Timothy Williams - David Williams
- Elijah Mahar - Crew
- Fred Estrada - Cultist
- Mario Roberts - Passerby
- J. Michael Straczynski
- Douglas Netter
Brian Thompson hace el papel de Robert Black.
Daniel Dae Kim interpreta a Lt. John Matheson en la serie.
Gary Cole hace el papel de Capt. Matthew Gideon.
David Allen Brooks interpreta a Max Eilerson en la serie.
Carrie Dobro hace el papel de Dureena Nafeel.
Marjean Holden hace el papel de Dr. Sarah Chambers.
Peter Woodward interpreta a Galen en la serie.
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