In Australia, four teenagers in a Sydney theater are astounded to hear the news that a nuclear war has broken out in Eastern Europe. They try to figure out the best way they can survive the coming conflagration.

Jim Craig has lived his first 18 years in the mountains of Australia on his father's farm. The death of his father forces him to go to the lowlands to earn enough money to get the farm back on its feet.

Lightning Jack Kane is an Australian outlaw in the wild west. During a bungled bank robbery he picks up mute Ben Doyle as a hostage. The two become good friends, with Jack teaching Ben how to rob banks, while they plan Jack's last heist.