Chogokin - Sometimes Chougokin or Cho-gokin - (超合金) is Japanese for "super Alloy" an is a fictitious material which first appeared in Go Nagai's Mazinger Z comic. It was later adopted by the Popy Toy company in 1972 as the name of a new line of die-cast metal robot and character toys sold in Japan. The very first of these toys was the "GA-01" Mazinger Z, which in spite of questionable engineering that led Popy to offer a free replacement campaign, ignited a craze that changed the face of the Japanese toy industry in the 1970s. Bandai - the parent company of Popy Toy - continues the Chogokin line to this day, branded under their own name.