In a world gone mad, the last human colony struggles to survive underground, beneath a land of nightmarish mutants who seek to destroy them. But when the mutant breaks inside humanity's final stronghold, the battle for survival pits the human colonists against their deadly invaders miles below the earth's surface.
| Directing | Andrew Stevens | Director |
| Writing | Andrew Stevens | Writer |
| Writing | Thomas McKelvey Cleaver | Writer |
| Production | Roger Corman | Executive Producer |
| Editing | Brent A. Schoenfeld | Editor |
| Sound | Terry Plumeri | Music |
| Production | Jonathan Winfrey | Associate Producer |
| Art | Cherie Day Ledwith | Set Decoration |
| Costume & Make-Up | Greg LaVoi | Costume Design |
| Camera | Janusz Kamiński | Director of Photography |
| Crew | Patrick J. Statham | Stunt Coordinator |
| Editing | Mato | Color Timer |
| Camera | Dan Kneece | Steadicam Operator |
| Art | Johan le Tenoux | Production Design |
| Production | Mike Elliott | Producer |
