Cast of Prince of Darkness

Donald Pleasence plays Father Loomis, a priest who is deeply involved in investigating the supernatural occurrences surrounding a mysterious liquid.

Lisa Blount portrays Catherine Danforth, a physics graduate student who assists in the investigation of the strange phenomena.

Victor Wong plays Howard Birack, a college professor who leads the group exploring the ancient evil linked to the liquid.

Jameson Parker takes on the role of Brian Marsh, a student who becomes entangled in the events as he helps his peers.

Dennis Dun plays Walter, a character who interacts with the main group as they confront the supernatural threat.

Susan Blanchard portrays Kelly, a character involved in the group's attempts to understand the evil forces at play.

Anne Marie Howard plays Susan Cabot, a member of the group affected by the incidents surrounding the liquid.

Ann Yen takes on the role of Lisa, a character who experiences the events firsthand along with her friends.

Ken Wright plays Lomax, a character who becomes a part of the group's efforts to combat the emerging danger.

Dirk Blocker portrays Mullins, contributing to the cast as the story unfolds.

Jessie Lawrence Ferguson plays Calder, one of the characters who faces the terrifying scenarios presented in the film.

Peter Jason plays Dr. Paul Leahy, a medical professional involved in the investigation of the supernatural occurrences.