Julie Christie in Demon Seed (1977)

Just like Hal 9000 in 2001, this film features a homicidal computer (Proteus IV), but unlike misunderstood Hal, this one is cruel and willful. Susan Harris (Christie) is the wife of Alex (Fritz Weaver), a computer programmer working in the area of artificial intelligence. Because of his total immersion in his work, Susan thinks he's becoming dehumanized and they've decided on a trial separation. Meanwhile, the project Alex is working on - a super computer designed to mimic human reasoning and abstract thought - is starting to become somewhat difficult to handle. Little does Alex know that it's taken over his highly computerized home and is holding his wife captive as it tries to convince her to submit to heinous experiments into the human condition.

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This disturbing film has has some scary moments in it, and has an extremely bleak outlook on our relationship with technology. It also has some far reaching plot points that tend to bend ones ability to suspend disbelief. The computer is voiced menacingly by Robert Vaughn

This film is available on DVD and is moderately well known, though not a classic by any stretch of the imagination. The trailer is above, uploaded to YouTube by warnerarchive.

Obscurity factor: 6 (somewhat known, on DVD)