Master of Orion II: Battle at Antares

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Forge an empire in a universe where population growth is stripping away planetary resources. Colonize unknown planets and trade with other races for their knowledge.
The need for galactic expansion is critical. You must conquer alien star systems to secure the resources that will guarantee your supremacy. The ultimate goal is to defeat the evil Antarans. They lurk in the coldest reaches of space, warmed by one all-consuming passion... Revenge!

One of the best 4X games ever created
Absolutely addictive gameplay with a powerful "just one more turn" factor
Tactical ship combat, galaxy-spanning strategy, 60 technology fields, advanced diplomacy and much more

Note: This game is a part of Master of Orion, Collectors Edition package which includes 3 original Master of Orion titles available on Steam for the first time and new Master of Orion game published by WG Labs.
This game will available for stand-alone purchase at a later date in the future.