Here in the late 80's, they aired Grendizer. I knew there was another cartoon called Mazinger airing in another network, my cousin would talk to me about Mazinger, there were toys around and everything, and I knew the Mazinger robot looked similar to the Grendizer robot, they were the only robots from that time who detached their arms and threw them to their enemies, but I didnt know which the relation betweeen the cartoons (animes) was.
Then with internet, I read about Koji Kabuto from Grendizer being the pilot of Mazinger Z, but in the Grendizer series he just pilots an UFO-like spaceship and a "spazer".
What happened with Mazinger Z in the Grendizer series, why didn't Koji Kabuto have it anymore?