Planet Killers

Someone tried to destroy the Earth. They nearly succeeded, just missing our planet and shattering the Moon. Millions of fragments rained down on the Earth. The death toll was staggering. Fortunately, mankind had reached a point in its development when flight to the stars was possible. The four surviving starships were converted from exploration to military use, and sent out on a journey taking them farther into the galaxy than any humans had ever gone before. The goal: find the race that tried to destroy us. The mission: revenge.