Dr. Tenma's son perished in a car accident, and in his grief, the doctor created a robot to replace him. However, he found that the robot still had differences in nature and thought compared to an ordinary person. Dr. Tenma's dissatisfaction with the robot led to it being abandoned and subsequently landing in a circus. Later, the robot was taken in by Dr. Tea and given a new name, Astro Boy. He was also granted new abilities: ten thousand horsepower and various weapons, becoming a guardian of justice and peace for humanity. With the regret of never truly being human, Astro Boy continues his battle against evil forces. Astro Boy, Iron Arm Astro Boy, Iron Arm Astro Boy.