I was so young when this first series aired that I only just barely remember Gigantor, I remember Series two much better but I remember both well enough. Watching Gigantor introduced me to what became my life long love of science fiction. Long before even the original Star Trek I loved racing to the TV on Saturday Mornings to watch Gigantor. I never understood why but even my parents knew Gigantor was special to me. I was more non verbal when I was young but, I loved singing the Gigantor theme song. I'd most ly sing the GI-GAN-TOR part only!
Gigantor was a very large powerful robot that defended the Earth from all sorts of wild weird super villians. Gigantor animation was very crude. Gigantor was rendered as a collection of large geometric shapes not because; the cartoon anime artists of the time lacked the eye for detail. In the time that Gigantor was created TV as a medium was in its infancy. Television resolution was often terrible by todays HDTV standards rendered strictly for primative black and white sets.
Notice how the black to white contrasting on Gigantors body is bold without subtle shading. Notice how Gigantor has basic regions of monochromatic shading. Gigantor could not be elaborately drawn because on a primative black and white set's low resolution the detail would turn to mud manking the image look fuzzy. Gigantor stories were often good if you remember the age of the kiddie audience it targets. The weird things about Gigantor is many times the powerful robot goes after terrorists that cause trouble in this futuristic time almost as if it foretold the times we live in today.
Unfortunately for us today some fifty years in the future we lack a Gigantor like robot that can kick terrorist butt.