| David Duchovny | Ira |
| Orlando Jones | Harry |
| Seann William Scott | Wayne |
| Julianne Moore | Allison |
| Ted Levine | Gen. Woodman |
| Ethan Suplee | Deke |
| Katharine Towne | Nadine |
| Michael Ray Bower | Danny |
| Pat Kilbane | Officer Johnson |
| Ty Burrell | Flemming |
| Gregory Itzin | Cartwright |
| Dan Aykroyd | Governor Lewis |
| Ashley Clark | Lt. Cryer |
| Michelle Wolff | Carla |
| Sarah Silverman | Denise |
| Richard Moll | Fire Training Inspector |
| Michael McGrady | Fireman |
| Steven Gilborn | Judge Guilder |
| Wayne Duvall | Dr. Paulson |
| Michael Chapman | Sheriff Long |
| Kyle Gass | Officer Drake |
| Lucas Dudley | Sergeant Toms |
| Steven Pierce | Sergeant Larson |
| Wendy Braun | Nurse Tate |
| Jennifer Savidge | Claire |
| Jerry Trainor | Tommy |
| Stephanie Hodge | Jill Mason |
| Kristen Meadows | Patty |
| Winifred Freedman | Debbi |
| Miriam Flynn | Grace |
A former government scientist teaching at an Arizona community college discovers rapidly developing organisms on a meteor.
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