A Toho film featuring the comedy duo Konto 55, (コント55号), comprised of comedians Kinichi Hagimoto and Jiro Sakagami.

Jack is a boy who lives with his animal friends Barnaby Bear, Dinah Dog, Squeeker Mouse and Phineas Fox. He's challenged to a race with Allegra, who turns out to be a witch. She takes Jack to the queen witch, Auriana. She plans on turning all her slaves into evil harpies.

In the year 2000, Dr. Boyton creates a super-robot in his deceased son's image. He calls the robot Astro Boy. Astro Boy can swim oceans, leap over mountains, even fly into space on his own power. However, Astro Boy can't replace his son. Dr. Boyton becomes dissatisfied with the boy robot and disowns him. Astro Boy is befriended by Dr. Packadermus J. Elefun of the Institute of Science, who guides him through his adventures. Endowed with super strength, rocket-powered flight, a selfless heart and a kind demeanor, Astro Boy fights a never-ending crusade against the forces of evil!