Tetsuwan Atom Odcinek 51: Rage of the Sphinx

The design of Astro's prototype equipped with a neutron bomb is stolen. With the help of a robot named Niki, Astro sneaks into the underground fortress in the Republic of Grotta to recapture the design. Prof. Rindolf, owner of Niki, revealing that he made Niki from the stolen design, initiates Niki's trigger device. Then, Astro asks Dr. Elephant to disassemble Niki and replace his leg to one of hers.