The Visitors

A star in our Milky Way, far away from Earth, holds the planet Experiment. People who homo sapiens thought had become extinct, are preparing to leave to find a new planet that can sustain their lives in a safer, more comfortable environment. Experiment is becoming extremely dangerous. Five families head in five directions hoping at least one will find a planet where they can all begin a new life.
One couple lands on Earth and finds it suitable for awhile. But what they encounter after acclimating to the culture, finds them wondering if it was a wise decision to stay. As they move through their lives, they experience things they'd never seen on Experiment. But they do see evidence that their old friends, the scientists, have been here before. Eventually, having no choice, they must expose themselves to the unknown.