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| Tim Allen | Jason Nesmith/Commanter Peter Quincy Taggart |
| Sigourney Weaver | Gwen DeMarco/Lieutenant Tawny Madison |
| Alan Rickman | Sir Alexander Dane/Dr. Lazarus |
| Tony Shalhoub | Fred Kwan/Tech Sergeant Chen |
| Sam Rockwell | Guy Fleegman/Security Chief 'Roc' Ingersol |
| Daryl Mitchell | Tommy Webber/Lieutenant Laredo |
| Enrico Colantoni | Mathesar |
| Robin Sachs | Sarris |
| Patrick Breen | Quellek |
| Missi Pyle | Laliari/Jane Doe |
| Jed Rees | Teb |
| Justin Long | Brandon |
| Jeremy Howard | Kyle |
| Kaitlin Cullum | Katelyn |
| Jonathan Feyer | Hollister |
| Corbin Bleu | Young Tommy Webber |
| Wayne Pere | Lieutenant Lathe |
| Samuel Lloyd | Neru |
| Bill Chott | Fan |
| Morgan Rusler | Fan |
| Gregg Binkley | Fan |
| Brandon Michael DePaul | Fan |
| Paul G. Kubiak | Fan |
| Greg Colbrook | Fan |
| Jennifer Manley | Shy Girl |
| John Patrick White | Teen in the Bathroom |
| Todd Giebenhain | Teen in the Bathroom |
| J.P. Manoux | Excited Alien |
| Dan Gunther | Navigator |
| Matt Winston | Technician No. 1 |
| Brandon Keener | Technician No. 2 |
Aliens, believing actors to be real heroes, enlist cast members of a sci-fi TV series to help save their people.
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