EnglishTim Allen as Jason Nesmith/Cmdr Peter Quincy Taggart
Sigourney Weaver as Gwen DeMarco/Lt Tawny Madison
Alan Rickman as Alexander Dane/Dr Lazarus
Tony Shalhoub as Fred Kwan/Tech Sgt Chen
Sam Rockwell as Guy Fleegman/Security Chief 'Roc' Ingersol
Daryl Mitchell as Tommy Webber/Lt Laredo
Enrico Colantoni as Thermian Cmdr Mathesar
Robin Sachs as General Roth'h'ar Sarris
Patrick Breen as Thermian Quellek
Missi Pyle as Thermian Laliari/Jane Doe
Jed Rees as Thermian Historian Teb
Justin Long as Brandon Wheeger Commander Fan
Jeremy Howard as Kyle Commander Fan
Kaitlin Cullum as Katelyn Commander Fan
Jonathan Feyer as Hollister Commander Fan
Corbin Bleu as Young Tommy Webber
Wayne Pére as Lieutenant Lathe
Samuel Lloyd as Neru
Bill Chott as Fan
Morgan Rusler as Fan
Gregg Binkley as Fan
Brandon de Paul as Fan
Paul G Kubiak as Fan
Gregory Colbrook as Fan
Jennifer Manley as Shy Girl
John Patrick White as Teen in the Bathroom
Todd Giebenhain as Teen in the Bathroom
JP Manoux as Excited Alien
Dan Gunther as Navigator
Matt Winston as Technician
Brandon Keener as Technician
Dian Bachar as Nervous Tech
Rainn Wilson as Senior Thermian Requisition Officer Lahnk
Susan Egan as Teek
Heidi Swedberg as Mrs Wheeger
Isaac C Singleton Jr as Sarris' Guard
Jerry Penacoli as Reporter
Joel McKinnon Miller as Warrior Alien
Kevin McDonald as Announcer
Daniel Parker as Alien Fan
Dawn Hutchins as Inventory Clerk
Joe Frank as NSEA Protector Computer
Larry Richards as Thermian Greeter
Mic Tomasi as Thermian Greeter
Jeff Edwards as Puppeteer
Heath Castor as Convention Goer
Joseph J Dawson as Mank'nar #1 in Prosthetics
Paulie DiCocco III as Convention Goer
David Dorfman as Boy
Michael Haboush as Thermian Soldier
Erik Johnson as Convention Goth
Rocco Salata as Sarris Soldier