The Precursors are an ancient race from the Star Control Universe.
Some time around 200,000 BCE they had traveled towards the galactic center. Every 50,000 years or so, the Precursors would leave behind a rainbow world toxic waste dump since their extremely developed economy and advanced technology required extensive resources. It took the Precursors about 400,000 years to traverse the local space region around Earth. They built large colonies and seeded planets with exotic life forms.