An honest marshal in a corrupt mining colony on Io, Jupiter's sunless third moon, is determined to confront a violent drug ring even though it may cost him his life. After his wife angrily deserts him, he waits alone for the arrival of killers hired by the company to eliminate him.
| Sound | Jerry Goldsmith | Original Music Composer |
| Editing | Stuart Baird | Editor |
| Camera | Stephen Goldblatt | Director of Photography |
| Directing | Peter Hyams | Director |
| Writing | Peter Hyams | Screenplay |
| Production | Richard A. Roth | Producer |
| Costume & Make-Up | John Mollo | Costume Design |
| Art | Stuart Rose | Set Decoration |
| Production | Mary Selway | Casting |
| Camera | Freddie Cooper | Camera Operator |
| Crew | Anthony Van Laast | Choreographer |
| Sound | George Korngold | Music Editor |
| Art | Malcolm Middleton | Art Direction |
| Costume & Make-Up | Tiny Nicholls | Costume Supervisor |
| Camera | George Whitear | Still Photographer |
| Costume & Make-Up | Peter Robb-King | Makeup Artist |
| Sound | Clyde McKinney | Dolby Consultant |
| Art | Philip Harrison | Production Design |
| Crew | Danny Skundric | Property Master |
| Sound | Leonard A. Engel | Music Editor |
| Camera | Bob Kindred | Camera Operator |
| Sound | Gordon Davidson | Supervising Sound Editor |
| Sound | Robin Gregory | Sound Mixer |
| Costume & Make-Up | Colin Jamison | Hairdresser |
| Crew | John Stears | Special Effects |
| Sound | Scott Burrow | Assistant Sound Editor |
| Directing | June Randall | Continuity |
| Sound | Jay Engel | ADR Editor |
| Sound | Terry Sharratt | Boom Operator |
| Sound | David M. Horton | Sound Editor |
| Sound | Richard Oswald | Sound Editor |
| Crew | Lynda Levy | Unit Publicist |
| Sound | Neil Burrow | Sound Editor |
| Sound | Jeffrey Landgren | Assistant Sound Editor |
| Lighting | John May | Gaffer |
| Editing | Russ Woolnough | First Assistant Editor |
| Production | Fred Harding | Production Accountant |
| Art | Albert Blackshaw | Construction Manager |
| Sound | Chester Slomka | Sound Editor |
| Art | Peter Donen | Title Designer |
| Production | Denis Johnson | Production Manager |
