The Quiet Earth
Zac Hobson was the last man on Earth
The Quiet Earth is a 1985 New Zealand science fiction post-apocalyptic film directed by Geoff Murphy and starring Bruno Lawrence, Alison Routledge and Pete Smith as three survivors of a cataclysmic disaster.
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A man wakes up to find himself literally alone in the world, and goes about trying to find other survivors, as well as to find out what happened. He suspects that a government research project he was involved in had something to do with the disappearance of everyone. Eventually he finds several other people, and once they begin to trust each other they try to figure out why they were left on earth.