After making a brief appearance in the final two panels if Eagle 130, the Populators make their first full appearance in issue 131.
The Populators of Pollux are programmed to search the galaxy and find a hospitable world where the Polluxian eggs, that they safeguard, may thrive and grow to maturity.
After previously sending the Gemini Plague to Earth (to kill all its inhabitants), the Populators arrive at Earth, expecting an empty planet that they can populate with their masters. Instead they find their plans thwarted and the Geminid creatures destroyed (by Doomlord).
They move on to phase two and start sterilising parts of Australia. But are eventually defeated by Doomlord, who destroys the cooling system on their ship's reactor, causing it explode. The remaining Polluxian eggs on Earth are destroyed.