Unlikely heroes must overcome incredible dangers to save mankind from the threat of an alien invasion.
| Actor | Role |
|---|---|
 Christopher MeloniDet. Samuel 'Sam' Adams | Det. Samuel 'Sam' Adams |
 Marcia CrossKaren Mackaphe | Karen Mackaphe |
 John C. McGinleyFBI Agent Vincent Naples | FBI Agent Vincent Naples |
 Chad LoweCommander Fauk | Commander Fauk |
 Dabney ColemanSenator Ben Arnold | Senator Ben Arnold |
 Melinda CuleaAllison | Allison |
 Thunderbird DinwiddieDep. Madeline Chandler | Dep. Madeline Chandler |
 Jeff MonahanEmmett | Emmett |
| SStephani VictorCarrie | Carrie |
 Terry LoughlinSheriff Maxwell Pierce | Sheriff Maxwell Pierce |
| JJanell McLeodMrs. Darlington | Mrs. Darlington |
| JJohn R. CopemanPaul Jackson | Paul Jackson |
 Tim ParatiRaymond | Raymond |
 Richard FullertonMr. Lippman | Mr. Lippman |
 Eric PaskelChip Harley | Chip Harley |
| CCheryl RyanMrs. Lippman | Mrs. Lippman |
| CCourtney Allen CrumplerTammy Mackaphe | Tammy Mackaphe |
| DDilsey DavisNate, Emmett's Gang | Nate, Emmett's Gang |
| IIndy KennedyBeth Adams | Beth Adams |
| JJenna YoungBeautician (uncredited) | Beautician (uncredited) |