Fall 1978

One year after Yamato's return saved Earth, a gigantic white comet appears from deep space, erasing everything in its path. The object is actually the advance of the White Comet Empire, a conquering power moving relentlessly toward Earth.When the Yamato crew receives a mysterious warning from the distant world of Telezart, they choose to launch even without official approval. Their journey places them between a vastly stronger enemy, Earth's own military decisions, and old foes who have not forgotten their defeat. As the comet closes in, the crew must discover what can stop an empire that treats entire planets as obstacles to be swept away.

Two years after Galactor's defeat and Joe the Condor's apparent death, Leader X returns. An attack on a cruise ship leaves a young survivor in his hands, and he forcibly transforms her into the adult-looking Gel Sadra, the unstable new figurehead of the revived Galactor.The Science Ninja Team is called back into action, but replacing Joe proves more complicated than expected. A supposed new member, Hawk Getz, hides a deadly secret, and a mysterious feather weapon begins appearing around the team. When Joe himself finally returns with cybernetic changes that explain his survival, the reunited heroes face an enemy whose new leader is unknowingly tied to one of the tragedy's surviving families.