 | John Stockwell als Michael Harlan |
 | Danielle von Zerneck als Ellie Sawyer |
 | Fisher Stevens als Vince Latello |
 | Raphael Sbarge als Sherman |
 | Richard Masur als Detective Isadore Nulty |
 | Barry Corbin als Lew Harlan |
 | Ann Wedgeworth als Dolores |
 | Dennis Hopper als Bob Roberts |
 | Candace Silvers als Irene |
 | Beau Dremann als Matusky |
| Pat Simmons als Crystal |
| John Vidor als Jock #1 |
| Vincent Barbour als Jock #2 |
| Jaime Alba als Jock #3 |
| Robert Beer als President Eisenhower |
 | John Carter als General |
| Cameron Young als General's Aide |
| Noel Conlon als Secret Service Man |
 | Jackson Bostwick als Sentry |
 | Robert DoQui als Desk Sergeant |
| Elven Havard als Fireman |
| Linda Hoy als Librarian |
| Robin Allyn als Ellie's Friend |
 | Michael Berryman als Mutant #1 |
| Chuck Hemingway als Coy |
 | Pamela Springsteen als Hall Monitor Ellie's Friend |
| Matt Hoelscher als Preppie |
| Jack O'Leary als Sentry at Air Force Guardhouse |
| Clare Peck als Policewoman |
| Joel Harrison als Wino |
| Ann Culotta als Trucker's Wife |
| Hank Calia als Neanderthal Man |
| Scott Bailey Spangler als Guard #2 at Air Force Guardhouse |
 | Frank Welker als Alien (voice) |
 | Dawna Lee Heising als Sorceress (uncredited) |
 | Al Leong als Vietnamese Soldier (uncredited) |
 | Gerald Okamura als Vietnamese Soldier (uncredited) |
| Jonathan R. Betuel | Writer |
| Jonathan T. Taplin | Producer |
| David L. Snyder | Production Design |
| Lance Anderson | Makeup Effects |
| Carroll Timothy O'Meara | Editor |
| Jerry Wunderlich | Set Decoration |
| Bill Shepard | Casting |
| Zoltan Elek | Makeup Artist |
| Peter Bernstein | Original Music Composer |
| Jonathan R. Betuel | Director |
| David M. Walsh | Director of Photography |
| John B. Mansbridge | Art Direction |
| Betsy Jones | Costume Design |
| Rick Baker | Makeup Artist |
| Steven Lambert | Stunts |
| E. Darrell Hallenbeck | Associate Producer |
| John Scheele | Visual Effects Supervisor |
| E. Darrell Hallenbeck | Unit Production Manager |
| Jerry Sobul | First Assistant Director |
| Carole Keligian | Second Assistant Director |
| Stephen Dane | Assistant Art Director |
| David Q. Quick | Property Master |
| Curtis Roush | Music Editor |
| Colin C. Mouat | Supervising Sound Editor |
| Joe Parker | Sound Editor |
| Wayne Allwine | Sound Editor |
| James J. Isaacs | Sound Editor |
| David A. Whittaker | Sound Editor |
| George Probert | Sound Editor |
| Mark Eggenweiler | Assistant Editor |
| Lynne Bailey Smith | Assistant Editor |
| Alan Howarth | Sound Effects Designer |
| Edward Malone | Assistant Sound Editor |
| B. Scott Senechal | Sound |
| James E. Webb | Sound |
| Paul Holzborn | Foley Artist |
| Al Maguire | ADR Editor |
| Nick Alphin | Sound Re-Recording Mixer |
| Andy MacDonald | Sound Re-Recording Mixer |
| Tom Gerard | Sound Re-Recording Mixer |
| Jay Lawton | Music Supervisor |
| David Spear | Orchestrator |
| Joel Rosenbaum | Orchestrator |
| Alf Clausen | Orchestrator |
| Brian Mann | Orchestrator |
| Robert Edesa | Camera Operator |
| Michael Nash | First Assistant Camera |
| Martin G. Beazell | Second Assistant Camera |
| Norman Harris | Gaffer |
| Ron Kenyon | Best Boy Electric |
| Richard Moran | Key Grip |
| Danny Boldroff | Dolly Grip |
| Hugh Langtry | Grip |
| Nigel A. Boucher | Leadman |
| Dennis DeWaay | Construction Coordinator |
| Jack Sandeen | Costume Supervisor |
| Susie S. McEveety | Costumer |
| Don Vargas | Costumer |
| Robert J. Schiffer | Makeup Supervisor |
| KG Ramsey | Hairstylist |
| Faye Brenner | Script Supervisor |
| Rolf Darbo | Location Manager |
| Robert Werden | Unit Publicist |
| Ralph Nelson Jr. | Still Photographer |
| Michael Adams | Stunts |
| Alonzo Brown Jr. | Stunts |
| John Cade | Stunts |
| Michael Cassidy | Stunts |
| Larry Duran | Stunts |
| David M. Graves | Stunts |
| Tracy Hutchinson | Stunts |
| Max Kleven | Stunts |
| Joel Kramer | Stunts |
| Walt La Rue | Stunts |
| Al Leong | Stunts |
| Anderson Martin | Stunts |
| Rex Pierson | Stunts |
| Bill Saito | Stunts |
| Glenn R. Wilder | Stunts |
