Victor Carroon (Richard Wordsworth) was one of three astronauts launched into space in a rocket by Professor Bernard Quatermass (Brian Donlevy), but he's the only one found on board when the rocket crashes on a farm. When he's dragged free, all Victor can say is "Help me," before slipping into more-or-less a catatonic state. Before long, it becomes apparent to Quatermass, Scotland Yard Inspector Lomax (Jack Warner), and others that something inhuman has taken over Victor, threatening the entire world.
Watching it for the first time, I see why it appeals to Carpenter. It's apocalyptic sci-fi horror, dark and cynical, and it mixes subtle mystery and tension with (for the time) graphic shocks.