Magnamite

Magnamite is a power station robot that supplies Metro City's power. It was designed in the form of a giant mechanical spider.

Story
Dr. Hiroshi Ochanomizu sent an emergency message to the Metro City power plant to reroute the city's power supply to the Ministry of Science in an effort to complete Astro Boy's awakening. Though the procedure was successful, Magnamite became overloaded with power and lost control, breaking out of its generator room and rampaging across the city.

Astro confronted the robot in an effort to save Dr. Ochanomizu. During the battle, the two realized they could communicate with each other, and Astro offered to absorb the excess energy from the giant robot into his own body. As a result, Magnamite was able to regain control and returned to the power plant where he continued supplying the city's energy.

Appearances
"Power Up! "

Video game
Magnamite makes an appearance in Astro Boy: Omega Factor as the game's first boss. Here, its name is spelt as "Magnemite" and once it went out-of-control, it caused several other robots to do the same thing, some of them kidnapped Dr. O'Shay's assistant, Wato. After Astro defeated the Mangemite, Atlas revealed himself to be the cause of its lost control.

The Magnemite must be defeated again in Rebirth to finish the whole game. Its rampage is what allowed Drake to replace Duke Red as international councilor. Later, Sharaku sent the Magnemite to keep Astro from interfering with his master plan. However, after defeating it once again, it immediately came back making Astro realized that this version would never die. So, Pluto decided to fight the Magnemite in his place while Astro went closer to Death Mask.