Niets is wat het lijkt in de wereld van de verzekeringsinspecteur John Trent. Zeker niet nadat hij wordt ingeschakeld om de verdwijning van schrijver Sutter Cane, wiens horrorboeken geleidelijk aan tot een massahysterie zijn gaan leiden, te onderzoeken.
Nee, helaas is In the Mouth of Madness nog niet beschikbaar op Netflix in Nederland.
| Art | Elinor Rose Galbraith | Set Decoration |
| Sound | John Carpenter | Original Music Composer |
| Editing | Edward A. Warschilka | Editor |
| Camera | Gary B. Kibbe | Director of Photography |
| Production | Sandy King | Producer |
| Sound | Jim Lang | Original Music Composer |
| Writing | Michael De Luca | Screenplay |
| Directing | John Carpenter | Director |
| Production | Artist W. Robinson | Associate Producer |
| Art | Peter Grundy | Art Direction |
| Production | Michael De Luca | Executive Producer |
| Costume & Make-Up | Robin Michel Bush | Costume Design |
| Art | Jeff Ginn | Production Design |
| Production | Brian Campbell | Location Manager |
| Visual Effects | Rob Coleman | Animation |
| Crew | Jeff Imada | Stunt Coordinator |
| Crew | Alison Reid | Stunts |
| Crew | Shelley Cook | Stunts |
| Costume & Make-Up | Donald Mowat | Makeup Artist |
| Costume & Make-Up | James D. Brown | Hairstylist |
| Directing | Adam Druxman | Second Assistant Director |
| Directing | Artist W. Robinson | First Assistant Director |
| Directing | Stuart Williams | Second Second Assistant Director |
| Sound | Ron Bartlett | Sound Effects Editor |
| Sound | Jeff Courtie | Foley Mixer |
| Sound | John Dunn | Supervising Sound Editor |
| Sound | Donald Flick | Sound Editor |
| Sound | Larry Hoki | Sound Recordist |
| Sound | Owen Langevin | Sound Mixer |
| Sound | Matthew C. May | Sound Editor |
| Sound | Ken S. Polk | Sound Re-Recording Mixer |
| Sound | John Pospisil | Sound Designer |
| Sound | Robert Thirlwell | Sound Re-Recording Mixer |
