The Earth is invaded by alien parasites—AKA 'slugs'—that ride on people's backs and control their minds.
| Writing | David S. Goyer | Screenplay |
| Writing | Robert A. Heinlein | Novel |
| Directing | Stuart Orme | Director |
| Writing | Ted Elliott | Screenplay |
| Writing | Terry Rossio | Screenplay |
| Art | James Hegedus | Art Direction |
| Crew | Greg Cannom | Makeup Effects |
| Art | Daniel A. Lomino | Production Design |
| Camera | Clive Tickner | Director of Photography |
| Production | Ralph Winter | Producer |
| Production | Sharon Howard-Field | Casting |
| Production | Michael Engelberg | Executive Producer |
| Editing | William Goldenberg | Editor |
| Art | Cloudia Rebar | Set Decoration |
| Sound | Colin Towns | Original Music Composer |
| Crew | Chad Randall | Stunt Coordinator |
| Crew | Dick Ziker | Stunts |
| Costume & Make-Up | Tom Bronson | Costume Designer |
| Production | Andrew G. La Marca | Unit Production Manager |
| Directing | Michael Grossman | First Assistant Director |
| Directing | Pamela S. Kuri | Second Assistant Director |
| Visual Effects | Peter Montgomery | Visual Effects Supervisor |
| Crew | Henry Kingi Jr. | Stunts |
| Production | Barbara Harris | ADR Voice Casting |
| Art | William J. Durrell Jr. | Assistant Art Director |
| Art | Alan Manzer | Set Designer |
| Art | Gina Cafasso | Art Department Coordinator |
| Art | Jason Bedig | Leadman |
| Art | Michael Diersing | Construction Coordinator |
| Costume & Make-Up | David Rawley | Costume Supervisor |
| Costume & Make-Up | Kenn Smiley | Costumer |
| Costume & Make-Up | Linda S. Cormany | Set Costumer |
| Costume & Make-Up | Ann Masterson | Key Makeup Artist |
| Costume & Make-Up | Ann Brodie | Makeup Artist |
| Costume & Make-Up | Lee C. Harmon | Makeup Artist |
| Costume & Make-Up | Susan Meyer | Makeup Artist |
| Costume & Make-Up | Dorothy D. Fox | Hairstylist |
| Camera | Anthony Gaudioz | Camera Operator |
| Crew | Charlie Brewer | Stunts |
| Crew | Danny Epper | Stunts |
| Crew | Debbie Evans | Stunts |
| Crew | Jeff Imada | Stunts |
| Crew | Jeffrey J. Dashnaw | Stunt Coordinator |
| Camera | John T. Connor | First Assistant "A" Camera |
| Camera | Bruce M. Pasternack | "B" Camera Operator |
| Camera | Robert Heine | First Assistant "B" Camera |
| Camera | Jack Ellingwood | Second Assistant Camera |
| Camera | Mark 'Boylee' Boyle | Camera Loader |
| Directing | Susan Bierbaum | Script Supervisor |
| Sound | Robert J. Anderson Jr. | Sound Mixer |
| Sound | Dennis Fuller | Boom Operator |
| Art | Glen Hanz | Sculptor |
| Art | Linda Frobos | Sculptor |
| Lighting | James R. Tynes | Gaffer |
| Lighting | John 'Fest' Sandau | Best Boy Electric |
| Lighting | Charlie McIntyre | Rigging Gaffer |
| Camera | Gary Dagg | Key Grip |
| Camera | Joe Kelly | Best Boy Grip |
| Camera | Mike Connors | Dolly Grip |
| Lighting | Mario L. Davis | Key Rigging Grip |
| Camera | Leo Behar | Grip |
| Art | Jim Zemansky | Property Master |
| Crew | Roy Arbogast | Special Effects Coordinator |
| Editing | Jennifer Neysa Jew | Assistant Editor |
| Editing | Kate Crossley | Assistant Editor |
| Sound | Curt Schulkey | Supervising Sound Editor |
| Sound | Mark A. Mangini | Supervising Sound Editor |
| Sound | John Pospisil | Sound Designer |
| Sound | Julia Evershade | Supervising ADR Editor |
| Sound | George Simpson | ADR Editor |
| Sound | Solange S. Schwalbe | Foley Editor |
| Sound | Eric Lindemann | Foley Editor |
| Sound | Josephine Nericcio | Assistant Sound Editor |
| Sound | Aaron Glascock | Assistant Sound Editor |
| Sound | Sonny Pettijohn | Assistant Sound Editor |
| Sound | Doc Kane | ADR Mixer |
| Sound | Jon Hussein | ADR Mixer |
| Sound | Marilyn Graf | Foley Recordist |
| Sound | Ellen Heuer | Foley Artist |
| Sound | Christopher Moriana | Foley Artist |
| Sound | Rick Ash | Sound Re-Recording Mixer |
| Sound | Dean A. Zupancic | Sound Re-Recording Mixer |
| Production | Rebeca R. Brookshire | Production Coordinator |
| Production | Derek Wade | Assistant Production Coordinator |
| Directing | Conte Mark Matal | Second Second Assistant Director |
| Production | Douglas Wright | Casting Associate |
| Production | Maggie Gentle | Production Secretary |
| Production | Steve Dayan | Location Manager |
| Production | Darrin Lipscomb | Assistant Location Manager |
| Crew | Deborah Wuliger | Unit Publicist |
| Camera | Marsha Blackburn | Still Photographer |
| Crew | Don Tardino | Transportation Coordinator |
| Crew | Alan D. Purwin | Pilot |
| Sound | Kenneth Wannberg | Music Editor |
| Sound | Allan Wilson | Conductor |
| Sound | Colin Towns | Orchestrator |
| Editing | Bob Putynkowski | Color Timer |
| Editing | Theresa Repola Mohammed | Negative Cutter |
| Crew | Annie Ellis | Stunts |
| Crew | Tony Brubaker | Stunts |
| Camera | Peter McAdams | Grip |
| Crew | Eliza Coleman | Stunts |
| Crew | Lance Gilbert | Stunts |
| Crew | Gary McLarty | Stunts |
| Crew | Jack Gill | Stunts |
| Crew | Gregory J. Barnett | Stunts |
| Crew | Steve M. Davison | Stunts |
| Directing | Jeffrey J. Dashnaw | Second Unit Director |
| Crew | Billy D. Lucas | Stunts |
| Crew | Janet Brady | Stunts |
| Crew | Scott Wilder | Stunts |
| Crew | Mic Rodgers | Stunts |
| Crew | Kenny Endoso | Stunts |
| Crew | Erik Rondell | Stunts |
| Crew | Christine Anne Baur | Stunts |
| Crew | Lisa McCullough | Stunts |
| Crew | Norman Howell | Stunts |
