In the future mankind has terraformed Venus and Mars with the help of genetically engineered beings called Neo-Sapians. The Neos, who are treated as slaves, revolt. First they take the still inhospitable Mars and make it their home. Unsatisfied, they move to take Earth and the fully terraformed Venus. The armies of Earth and Venus fight back. This is a very well put together scifi war drama. The first couple of seasons held some amazing stories of the day to day struggles of war torn lives as well as some weighty insights into humanity.
