2001: A Space Odyssey is a sci-fi masterclass, but it's also the hub for a truly terrifying villain that disturbs viewers now more than ever.

A throwaway line from this hard sci-fi film continues to terrify and endure because of the underlying horror behind it.

HAL 9000 is one of the best-known articifical intelligence characters of modern film. This superior form of sentient computer embarks on a mission to Jupiter, along with a human crew, in Stanley ...