Minerva X is a fictional mecha from the anime and manga series Mazinger Z, created by Go Nagai. Within the story, Minerva X was designed by Professor Juzou Kabuto, but its plans were stolen and it was built by Doctor Hell. Minerva X only appeared in the thirty-eighth episode of that series.

She was named after Minerva, the Roman goddess of crafts and wisdom.

History:Designed many years ago by Professor Juzou Kabuto, Minerva X was intended to be a partner to his greatest creation Mazinger Z. As such, Minerva X has a highly similar body design to Mazinger, as well as having many common weapons. However, the plans for this machine were stolen by Doctor Hell, who later built it in an attempt to destroy Mazinger Z.

Unfortunately for Hell, Minerva X's artificial intelligence made it totally loyal to Mazinger, and it quickly defected to the Photonic Labs' team. However, the AI in Minerva made it view Mazinger in a romantic light, causing it to become very jealous and resentful of Sayaka Yumi's Aphrodite A, another lady robot. Sayaka herself was quite scared and even disturbed by this fact. In the meantime, Doctor Hell sent Archerian J5, a Mechanical Beast, to eliminate Minerva, as it was no longer any use to him. During the ensuing battle, Minerva took damage that caused it to lose its conscience, making it go berserk. Professor Yumi hurriedly worked on a way to bring Minerva back under control, but Kouji had to stop her from destroying the city. He first attempts to restrain Minerva, but when it attempts to destroy a nuclear plant, Sayaka is forced to attack, mortally damaging it.

Mazinger installs Professor Yumi's control system, restoring Minerva's consciousness just before it dies in Mazinger's arms. Afterward, Kouji and Sayaka give Minerva a burial at sea, hoping that it will rest in peace.

Source: Wikipedia