Carpenter's Apocalypse Trilogy The Thing (1982)
John Carpenter has retroactively named The Thing (1982) as the first film of an "apocalypse trilogy" — three films, made across twelve years, built around the destruction of a knowable world by a force that cannot be reasoned with. The other two are Prince of Darkness (1987) and In the Mouth of Madness (1994). The three films are united structurally by a small group of professionals who confront a threat whose project is the end of the world, and by the protagonist's discovery that the project is too far along to stop. Carpenter has described them as variations on the same film told three different ways.
The films
The Thing (1982)
Twelve men at a U.S. Antarctic research station discover a shape-shifting organism that has been buried in the ice for a hundred thousand years. The post-midpoint approach redefines the project from "save the camp" to "deny it the world." See The Thing (1982).
Prince of Darkness (1987)
A group of physicists is brought into a Catholic basement in Los Angeles to examine a cylinder of green liquid that the Catholic Church has been guarding for two thousand years. The liquid is the Antichrist; it is awake; it is summoning the Father, who is not God. The physicists' project is to keep the Antichrist from completing the summoning before sunrise. (wikipedia)
In the Mouth of Madness (1994)
An insurance investigator (Sam Neill) is hired to find a missing horror novelist (à la Stephen King) whose new book seems to be producing the events it describes. The investigator drives to a small New England town that does not exist on any map and discovers that the novelist has finished the book, that the book is the apocalypse, and that the world is already ending. (wikipedia)
The structural argument
The three films share a structural premise: the protagonist's job is not to save the world but to bear witness to its ending. The Thing's MacReady plants dynamite to deny the Thing the world; Prince of Darkness's Father Loomis seals the cylinder back into its mirror; In the Mouth of Madness's John Trent watches the world end and writes a book about watching it. Each film has an open ending in which the threat is contained, deferred, or relocated rather than defeated. None of the three films offer the audience a victory.
"The three films are the same film. The same film told three different ways. They are the films I want to be judged by." — John Carpenter, Cahiers du cinéma (2010s)
Each film locates the apocalypse differently
The trilogy's three films locate the source of the apocalypse differently. The Thing's apocalypse is biological — a living organism whose project is to imitate every life-form on earth. Prince of Darkness's apocalypse is theological — the Antichrist is a literal, physical, liquid presence in a Catholic basement. In the Mouth of Madness's apocalypse is narrative — the book is the apocalypse, the apocalypse is the book, the world ends because the words have been written. The three films together are a survey of the cosmologies an apocalypse can be located in: the body, the church, the text.
"Carpenter is the only American horror director of his generation who has been honest about what he believes. He believes the world is ending. The three films are not metaphors for an apocalypse. They are statements that the apocalypse is real and that the protagonists are watching it." — Mark Kermode, The Guardian (2010s)
The protagonists
Each of the three films is structured around a protagonist whose project is to bear witness rather than to win. MacReady tapes a record for whoever finds it. Father Loomis seals the cylinder and tells the surviving physicists to forget what they saw. John Trent escapes the apocalypse only to be committed to an asylum where his account is dismissed; the asylum is overrun in the final shot. Each protagonist is the last witness to a world that the audience knows is gone.
The casting pattern is also worth noting: Carpenter's apocalypse-trilogy protagonists are played by Kurt Russell (The Thing), Donald Pleasence (Prince of Darkness — Carpenter's Halloween villain returning as a Catholic priest), and Sam Neill (In the Mouth of Madness). The three actors share a register — controlled, ironic, unsentimental — that the apocalypse-trilogy films require.
The reception
The Thing was the worst-reviewed film of Carpenter's career on release; Prince of Darkness was reviewed unenthusiastically and is now a cult favorite; In the Mouth of Madness was Carpenter's last theatrical commercial film and is now widely considered one of his best. The reassessment of the trilogy has tracked the reassessment of The Thing.
"The three films are now recognized as a coherent body of work. They were not, in their moment. The Thing was treated as a misstep. Prince of Darkness was treated as a programmer. In the Mouth of Madness was treated as a goodbye to theatrical horror. We were wrong about all three. Carpenter knew what he was doing." — Glenn Kenny, RogerEbert.com (2014)
Why the apocalypse-trilogy framing matters
Carpenter's retroactive naming of the trilogy is not arbitrary. The three films were not produced as a trilogy — they were not pitched together, not greenlit together, and not released as a single project — but the structural and thematic continuities are tight enough that the framing is critical convention rather than marketing. Treating The Thing as the first film of an apocalypse trilogy rather than a one-off horror picture clarifies the film's project: it is the first film of three about how to live in a world that is being unmade, and the post-midpoint approach is the first time Carpenter staged the central question the trilogy is asking.