Astro Boy joins Professor Ochinomizu on a planetary exploration mission and discovers a floating “trash star” in space. On this derelict world, immobile robots have been discarded and stacked on top of each other, forming a towering pile. While navigating the wreckage, Astro rescues a dying robot soldier named Bemu and brings him back to Earth. “I’m tired of fighting!” Bemu exclaims, and the two form a warm friendship that grows deeper over time. One day, the trash star drifts toward Earth, threatening a massive collision that would cause a huge explosion and unleash chaos across the planet. Faced with this imminent disaster, there is only one way to prevent the crash. What will Astro do? Will he be able to protect Earth?