The story takes place in the 21st century. Due to the fact that pollution was becoming a major problem, scientists had developed the use of hydrogen fuel called "HBT" as an alternative to fossil fuels. At this time humans have colonized Mars in search of new place to call home as a result of overpopulation. In the year 2050, a mysterious alien race called the Inbit (Invid in Robotech, see "Adaptation For The Robotech Universe" below) invaded the Earth. Unable to fight the Inbits, Earth became desolate with only a few pockets of human beings scattered throughout the planet. Many of the refugees escape aboard a few remaining shuttles to seek shelter on the Moon. The Inbits set up their main base of operations in the Great Lakes area of North America called "Reflex Point".
However, the Mars colony, dubbed the Mars Base, does not forget about the plight of Earth. Troops are sent in to fight the Inbits from the Moon, only to fail miserably. The Inbits do not attack Mars, and show no interest towards the other planets. Surprisingly the Inbit show no hostility towards humans unless they are directly provoked. The Inbits can also sense the presence of HBT, and use of the fuel is limited under their supervision, as HBT is a common component in weapons technology. Overnight, Mars Base becomes a gigantic military machine, producing vast amounts of advanced weaponry and trained troops. In 2080, Mars Base sends in the next wave of troops. Although equipped with more technologically advanced equipment and transformable mecha, the attempt to recapture Earth is a failure.
As the plot unravels, the purpose of the Inbit's invasion is revealed. Their sole purpose of coming to the planet is because Earth provides them a suitable place to evolve into more complex beings. However, little did the Inbits know that their endeavor actually threatens to cause the extinction of both humans and Inbits and thus, it is up to Stick and his group, with the help of human-like Inbit (Aisha and Solzie), to convince the supreme ruler of the Inbit, the Refles, to flee from Earth
