Cast of In the Mouth of Madness

Sam Neill plays John Trent, an insurance investigator hired to locate missing horror writer Sutter Cane.

Julie Carmen portrays Linda Styles, an editor who works closely with the elusive author Sutter Cane.

Jürgen Prochnow takes on the role of Sutter Cane, the reclusive and mysterious horror novelist at the center of the story.

David Warner appears as Dr. Wrenn, a psychiatrist who becomes entangled in the madness surrounding Sutter Cane's work.

John Glover plays Saperstein, an associate of Sutter Cane who adds to the intrigue surrounding the author.

Bernie Casey portrays the character Robinson, a pivotal figure in John Trent's investigation into the disappearance of Sutter Cane.

Peter Jason embodies the character Mr. Paul, who becomes involved in the unfolding events related to Sutter Cane and John Trent.

Charlton Heston appears as Jackson Harglow, a wealthy and influential figure connected to the mystery surrounding Sutter Cane.

Frances Bay plays Mrs. Pickman, a resident of the town connected to Sutter Cane's fictional world.

Wilhelm von Homburg portrays Simon, a character caught up in the unfolding chaos tied to Sutter Cane's literature.

Kevin Rushton appears as Guard #1, a minor character within the settings explored by John Trent during his investigation.

Gene Mack takes on the role of Guard #2, another minor character encountered by John Trent on his journey.