The Chaos Machine

When the crew of a Shoomaran freighter find themselves stranded on Earth in 5342 BCE, they learn that the native inhabitants are destined to die out in only a thousand years.

Aided by a machine that can foretell the future, they are able to make minor changes from time-to-time in order to keep mankind on the path to survival. However, in spite of all of their efforts, the clock will finally run out for everyone in less than a year from now.

Unable to find a solution on their own, they turn to those that they have watched over for more than seven millennia.

But will the humans be able to find a way to save the solar system from annihilation?