Six Six Seven

2 girls for every boy. Doomsday planners pick the lucky few who will be allowed to take shelter in caves and tunnels. As a huge dirty snowball comet slowly scorches the planets surface, the survivors face a grim new future. With cooperation and luck, they may just survive. Hopefully they've planned for everything. Now they can only wait, and ask themselves, what else could possibly go wrong?

In a hastily converted bomb shelter underneath an old bomber factory, 200 adults, each an expert in some different job, are given a daunting task. 1000 teenagers, breeding stock for the time when humanity can re-emerge from caves and tunnels. The ratio is set at 2 females for every male. 333 boys, 666 girls.

But theres one bunk empty, Bunk Number 667. What happens to the last person admitted to a Doomsday Shelter? You may or may not be surprised.