Cast of In the Mouth of Madness

Sam Neill plays John Trent, an insurance investigator who is assigned to locate a missing author.

Julie Carmen portrays Linda Styles, an editor who assists John Trent in his investigation.

Jürgen Prochnow plays Sutter Cane, a popular horror novelist whose disappearance is central to the story.

David Warner takes on the role of Dr. Wrenn, a character involved in the psychological struggles of the plot.

John Glover plays Saperstein, a character who has connections to the mysterious author Sutter Cane.

Bernie Casey appears as Robinson, a character who interacts with John Trent during his investigation.

Peter Jason plays Mr. Paul, adding to the cast's exploration of the story's themes.

Charlton Heston portrays Jackson Harglow, a key figure in the unfolding events of the narrative.

Frances Bay plays Mrs. Pickman, a character who shares a chilling encounter in the story.

Wilhelm von Homburg plays Simon, adding an element of intrigue to the film.