One dark and stormy night, Dr. Komyoji, a scientist more interested in robotics than his young son and daughter, brings to life a robot with a human appearance and even a conscience circuit named "Gemini" after the cricket in Pinocchio which in theory should give him freewill. Exactly why he has created this robot named Jiro is a mystery because after the evil Professor Gil destroys the lab and Komyoji's fate is unknown.
Professor Gil sends several robots who look like guys wearing monster suits a la Godzilla movies, for example: overweight spiders and mantises who are quite comical looking to destroy Jiro. This is really the only weak point in the series. As Dr Komyoji's two children befriend Jiro in an effort to find out the fate of their father, Mitsuko learns that the Gemini circuit has a flaw in it which must be corrected or Jiro could be vulnerable to evil orders. She decides that if she can't fix the problem, Jiro must be destroyed. Her fears are realized when Jiro attempts to kill her while being controlled by Professor Gil.
Realizing that he can never fit in and is a danger to his "family", Jiro flees to the city and tries to lose himself in the crowd. For reasons not exactly clear to herself, Mitsuko hires a detective who walks around dressed like Sherlock Holmes and his partner, who looks like Velma from Scooby Doo to help her locate Jiro.
Boy oh boy, where do I start with the Frankenstein and Pinocchio refererences in this series? They aren't bad though. Yes, this is a mecha vs. monster of the week series with the big transformation scenes as Jiro hits the switches on his shoulders and transforms from a human appearance to android to fight against his potbellied attackers. The difference to me is the melancholy tone of it. Jiro wants to fit in and be like everyone else but everyone is always accusing him of being a monster, a freak, a cold machine. Even though the designs of the characters look to imitate the style of 40s and 50s manga, its not too distracting. Reminded me of Metropolis. The detectives bring some comic relief without being goofy. Like I said, the only weak point is the design of Gil's robots. You should check this series out.