Astro is investigating a super thermal bomb that has fallen on earth. Then he heads for Mercury to find its launching site. On his way, however, Astro loses his sight in an accident, and gets involved in a power struggle with aliens on Mercury.

地球に落下してきた超熱爆弾を調べていたアトムは、発射地点を目指して水星へと飛び立った。途中、事故で視力を失ってしまったアトムは、水星人たちの勢力争いに巻きこまれてしまう。