A spaceship returns to Earth carrying samples from Proxima b. As scientists study the specimens, they discover the alien elements are alive.

An unmanned spaceship returns to Earth carrying samples from Proxima B in the Alpha Centauri system. As scientists study the specimens they discover the alien elements are alive. Soon, the scientists must fight back as the small creatures replicate at an exponential rate, increase in size, turn violent, and attempt to take over Earth.