Millennium: Return to Earth is a sci-fi strategy/resource management sim created by Ian Bird and published by Electric Dreams. It was released for Atari ST, Amiga, and DOS in 1989. It is also known by the title Millennium 2.2.
The game is the prequel to Deuteros: The Next Millennium. As the commander of the Moonbase, you will have to gather resources, explore the solar system, colonize planets, and fight against the Martians, trying to re-establish life on the planet Earth.