In the year 2201, a year after the Yamato saved Earth from radioactive contamination, a new threat emerges. The Yamato embarks on its final mission to protect the planet once more. Earth has largely recovered from the battle against Gamilus, and reconstruction efforts now extend to other planets. When former Yamato crew members intercept a garbled message that appears to originate from a white comet on a collision course with Earth, they seize their old space fortress and prepare for a new confrontation.