The year is 2201, one year after the Star Force returned to Earth bringing the Cosmo DNA device which rid it of the radioactive pollution caused by Gamilon's planet bombs. Since that time, no longer threatened by outside forces, Earth has recovered and expanded its naval power and terrirory to the periphery of the Solar System. Most of the Star Force crew are assigned to various posts on Earth, although the Argo is currently on assignment as the flagship of the Solar System's peripheral defence patrol fleet. Commanding it is Deputy Captain Derek Wildstar.

Unknown to Earth, a new threat lurks in outer space. In the palace of the Comet Empire -- a huge mobile city fortress shrouded in a plasma field which makes it resemble a white comet -- its green-skinned ruler, Prince Zordar, plans for his next conquest, Earth. His minions, daughter Princess Invidia, and Generals Dire and Gorse, gather to review the plans for the Earth, the defenses of which are deemed vastly inferior. An easy victory is predicted.

But suddenly, a surprising voice pierces the air. Gamilon Leader Desslok steps out of the shadows of the throne room to chide the court for its overconfidence. They have failed to consider the Star Force. Invidia, immediately showing her disdain for the former Gamilon ruler, scoffs at this, asking whether this is the same Star Force which single-handedly wrecked Gamilon. Desslok scoffs at her arrogance, and insists that unless the Star Force is dealt with, the Comet Empire will be unsuccessful. He convinces Emperor Zordar to allow him to personally take care of the Star Force.

Meanwhile, Comet Empire strike planes begin stealth attacks on Earth's defence patrol fleet. Wildstar takes his Superstar flighter out on a solo mission to chase the mysterious enemy, only to be called back to the ship which has been crippled by an enormous EMF surge which has passed through the Solar System. The surge burns up many of the Argo's electrical circuits, but the communication system holds out long enough to record a garbled radio message from an unknown source. Could it be related to this new enemy, they wonder.

As the damaged Argo returns to Earth, it crosses flight paths with Earth's new flagship, Andromeda, commanded by Captain Gideon, on its maiden flight. Each captain masks pride with principle, and refuses to yield airspace. The two ships come within mere meters of collision. The Argo descends to Earth.