Ep. 12: Astro Boy travels to Cross Island to stop Dr. Serizawa's theft scheme
Aired on March 19, 1963

12
Dr. Serizawa, an escaped convict, arrives at Cross Island with the intent to steal its underground resources. He utilizes the transforming robot Puke, which can change into any form, to facilitate his plan. After securing the resources, Serizawa intends to flee the location using a rocket. Astro Boy tracks the fugitive to Cross Island to intervene in these criminal activities and prevent the theft of the island's valuable materials.
Episodes
- Ep. 8 · Dr. Ochanomizu uncovers a cloning plot in Gorgonia
- Ep. 9 · Astro Boy confronts the Black Looks group intent on destroying robots
- Ep. 10 · Astro Boy discovers a tomb and a loyal robot named Ivan on an alien planet.
- Ep. 11 · Astro Boy and a future boy journey to the ancient world to find the boy's missing father.
- Ep. 12 · Astro Boy travels to Cross Island to stop Dr. Serizawa's theft scheme
- Ep. 13 · A dying priest's mark on Jesus's eye reveals a gang's secret targeting Higeoyaji.
- Ep. 14 · Astro Boy and Sherlock Homespan confront the Kaito Kinsankaku gang's artificial sun threat
- Ep. 15 · Astro Boy Discovers Alien Water Collection from Planet Alfee
- Ep. 16 · White Planet vehicle enters Grand Prix with Astro Boy's AI after sabotage